test-drb

test-drb@ccmp.vtda.org

101090 discussions

by cclist＠sydex.com

> Date: Wed, 16 Apr 2008 15:49:42 -0700 (PDT) > From: "Eric Smith" > The most common error I've seen in Z80 designs is to drive the clock input > directly from a TTL part. The minimum Vih for the Z80 clock input is > higher than the minimum Voh for a TTL part. The Mostek Z80 CPU manual > shows a circuit using a transistor as an active pullup to increase the > clock swing. With the clock driven by standard TTL, Zilog specified a 330 ohm pullup. I've seen lots of instances where the Z80/Z80A clock was driven from an LSTTL or even a "canned" crystal oscillator with no pullups at all. It might be that later steppings were more tolerant of clock voltage. If one had an 8284A in the hellbox, it would also make a good choice; Voh(min) for the CLK output is 4v--but that might not be considered to be "vintage". Some early S100 boards used an 8224 to generate the Z80 clock. Cheers, Chuck

17 years, 12 months

Scion MicroAngelo S-100 Board

by marvin＠west.net

For anyone that is interested, I just posted the subject board over on Erik's new site, The Vintage Computer and Gaming Marketplace at: http://marketplace.vintage-computer.com/ I'll be starting to list other items there during the coming days as well.

17 years, 12 months

Mark 1 TR-107

by aliensrcooluk＠yahoo.co.uk

Hi, Since this was a) based on the Star Trek Tricorder; b) made in 1996 and; c) the company behind it has gone belly-up, I figured this would be classed as on-topic. "Here's a direct example of life imitating art. The Mark 1 TR-107 tricorder from Vital Technologies was unveiled in 1996 as a real scientific device. It could monitor electromagnetic fields, weather, color and light. The company apparently made 10,000 of them before going out of business. Vital's product was modeled on the tricorders used in the 'Star Trek' series." http://www.news.com/2300-11395_3-6121389-6.html and here's another page about it: http://www.stim.com/Stim-x/0996September/Sparky/tricorder.html I don't suppose anyone here has one of these? Regards, Andrew B aliensrcooluk at yahoo.co.uk

17 years, 12 months

Monroe electromechanical calculators

by hcchandler＠mac.com

I was reading a 3 year old message you had written where you had acquired a Monromatic 8N-3-213 that was "broken". If you still have it I might be able assist you to get it working. Former service manager of Boston,Detroit and Seattle for Monroe. Harry Chandler P.S. I'm a friend of Ernie Jorgens

17 years, 12 months

FW: Gerber help sought

by lynchaj＠yahoo.com

-----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of der Mouse Sent: Tuesday, April 15, 2008 8:45 PM To: cctalk at classiccmp.org Subject: Gerber help sought Prompted by my latest project (a cable pinout sensor - just plug a cable into it and you get the pinout), I want to look into the possibility of having one-off PC boards made. Everyone seems to want Gerbers, but without documenting exactly what they are. I found a PDF describing "RS-274X", which appears to be most of it, but there are lots of conventions it doesn't describe. I've found indications that there exists some open-source software, but extracting documentation from code is a mess. I'm going to be asking various people whose addresses I've found in various places. But you people are documentation packrats, so I'm asking here as well: anyone have any such doc? /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B -----REPLY----- Hi, I recently had to do something very similar. Maybe I can help you with Gerber file generation. I have recently designed a PCB version of my Z80 home brew computer using a free/open source EDA program called KiCad. The latest version is excellent and now includes an autorouter & optimizer for PCBs. Get the latest versions from the sourceforge site as the "stable" version is pretty stale, I think. Linux and Windows versions are available. http://www.lis.inpg.fr/realise_au_lis/kicad/ It uses the awesome free PCB routing tool at: http://freerouting.net I have an example circuit board up on my project site. http://groups.google.com/group/n8vem The gerber files are bundled in the ZIP file. KiCad includes a gerber file viewer utility. KiCad and freerouting.net are a great combination and are easy to use and learn. I was able to learn the program from a total cold start to nearly complete project (schematic, PCB layout, part selection, routing traces, gerber file creation, drill file, etc) in just a few days. My plan is to have the PCBs made at (they seem pretty inexpensive, if there are cheaper / better options available, I would like to hear them) https://www.barebonespcb.com/!BB1.asp Thanks and good luck! Andrew Lynch PS, if there are any experienced CCTALK veterans who'd like to review & critique my home brew Z80 SBC design, I would much appreciate your comments. I have completed PCB routing & optimization but haven't placed the order yet. A little peer review from knowledgeable person(s) would definitely be a big help. I'd rather find the faults *before* the boards a cut!

17 years, 12 months

Looking for a LM4250H 8 Pin DIP or A real good substitute

by lynchaj＠yahoo.com

Wed Apr 16 08:11:52 CDT 2008 * Previous message: Atari history * Next message: Looking for a LM4250H 8 Pin DIP or A real good substitute * Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] ________________________________ I am Looking for a LM4250H 8 Pin DIP or A real good substitute. I found a Data Sheet but having trouble locating any Parts. I am hoping someone has one in their Parts Box TIA Bob in Wisconsin USE trebor07 at execpc.com <http://www.classiccmp.org/mailman/listinfo/cctalk> ________________________________ -----REPLY----- Bob, I bought some a while back from UnicornElectronics.com. They are really cheap parts and it fixed my home brew S-100 bus terminator with no problems. Apparently those op-amps get worn out over time and just die occasionally, I guess. At least replacing the one on mine worked. Thanks and good luck! Andrew Lynch

17 years, 12 months

Gerber help sought

by mouse＠Rodents.Montreal.QC.CA

Prompted by my latest project (a cable pinout sensor - just plug a cable into it and you get the pinout), I want to look into the possibility of having one-off PC boards made. Everyone seems to want Gerbers, but without documenting exactly what they are. I found a PDF describing "RS-274X", which appears to be most of it, but there are lots of conventions it doesn't describe. I've found indications that there exists some open-source software, but extracting documentation from code is a mess. I'm going to be asking various people whose addresses I've found in various places. But you people are documentation packrats, so I'm asking here as well: anyone have any such doc? /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

17 years, 12 months

Looking for a LM4250H 8 Pin DIP or A real good substitute

by trebor72＠execpc.com

I am Looking for a LM4250H 8 Pin DIP or A real good substitute. I found a Data Sheet but having trouble locating any Parts. I am hoping someone has one in their Parts Box TIA Bob in Wisconsin USE trebor07 at execpc.com

17 years, 12 months

Looking for a LM4250H 8 Pin DIP or A real good substitute

by cclist＠sydex.com

Date: Wed, 16 Apr 2008 11:17:07 -0500 From: "Robert J. Stevens" > I am Looking for a LM4250H 8 Pin DIP or A real good substitute. I found > a Data Sheet but having trouble locating any Parts. I am hoping someone > has one in their Parts Box TIA Bob in Wisconsin USE trebor07 at execpc.com My cross-reference charts say that the TI OPA704PA (in current production and available from Digi-Key) is a drop-in substitute. The Philips ECG944M may also work. Cheers, Chuck

17 years, 12 months

The history of the double sided floppy given under oath

by sellam＠vintagetech.com

I sent this to my friend Shrikant who worked at Shugart back during this time and this is how he replied: "Yes, I demonstrated and explained the reason why but the decision to use Tandon's technology was a business decision. We swapped the licenses for Tandon's "Bi-compliant" head actuator patent and Xerox/Shugart's "Band Actuator" patent of Warren Dalziel "I will explain more to you when I return.. "One lesson to learn from this episode was that as Goethe said in Faust and I only paraphrase him: One has to work to make one's own what we inherit from our forefathers. "In context of Shugart, the "Tri-compliant" design a la IBM was implemented without knowing its subtleties and slider/spring behaviour. I think Shugart did learn the lesson as far as egos would permit." I'll post the remainder of his reply when I receive it. -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

17 years, 12 months

Gerber help sought

by les＠frii.com

There are two gerber standards, 274D and 274X. 274X has the aperture information embedded in the gerber file, 274D has a seperate aperture file. I have a program I wrote to merge 274D files and aperture files into a 274X file, as many board houses no longer accept 274D files. The PCB package I use only generates 274D files. http://www.lh1.org/autotrax/autotrax.html I use Protel Autotrax. This is a formerly commercial program, which is now public domain. It is a DOS application. It supports up to eight layer PCBs, with no limit on the number of components or board size (up to 32 inches by 32 inches). It has an autorouter, which I never use. I have created PCBs up to 12 inches by 12 inches with over 1200 components using this package. Although the 274 spec allows multiple layers to be placed in one file, I don't know of any board houses which support that format. I use a standard file naming convention, but board houses usualy like to get a text file listing which file is which layer. Advanced circuits has you assign layers to files when you upload your data. Here is a typical readme file: GERBER TOP LAYER FILE NAME ;FLUXGATE.GTL GERBER BOTTOM LAYER FILE NAME ;FLUXGATE.GBL GERBER TOP SOLDER MASK FILE NAME ;FLUXGATE.GTS GERBER BOTTOM SOLDER MASK FILE NAME ;FLUXGATE.GBS GERBER TOP COMPONENT MASK FILE NAME ;FLUXGATE.GOV GERBER BOTTOM COMP MASK FILE NAME ;FLUXGATE.GBO ASCII NC DRILL FILE NAME ;FLUXGATE.TXT NC DRILL TOOL SIZE FILE NAME ;FLUXGATE.TOL A friend of mine maintains a open source pcb layout program, available at: http://opencircuitdesign.com/pcb/

17 years, 12 months

Atari history

by jack.rubin＠ameritech.net

This was pointed to on another list - some great stories and a slightly different perspective on (late) DRI - http://www.dadhacker.com/blog/?s=atari+st Jack No virus found in this outgoing message. Checked by AVG. Version: 7.5.524 / Virus Database: 269.23.0/1379 - Release Date: 4/15/2008 6:10 PM

18 years

SGI INDY top lid in good condition?

by jlobocki＠gmail.com

hello, I am looking for the lid to an SGI indy, but cant seem to find one anywhere. does anyone have any they could sell me, or know where i could find one? thanks

18 years

Chess

by cclist＠sydex.com

Date: Tue, 15 Apr 2008 12:08:06 -0700 > From: "Rick Bensene" > I played this a lot on weekends when I was the Cyber 73 weekend operator > at Tektronix. This was under KRONOS rather than SCOPE. I believe that the > console command was X.CHESS It used both CRT's, the left for a nice vector > display of the game board, and the right for a listing of the moves made > thus far, elapsed time, and for entering moves. I believe that the main > program ran all of the chess processing, and that a PPU program > communicated with the main program. When I got the Chess bootleg release tape from a friendly site analyst (they always got the good stuff first), I had to rework the display driver to work with our own OS, which used much of the PP code from Scope 3.1.6. It wasn't difficult, but the presence of a dedicated display driver required that one EDITLIB the driver into the system library--something you weren't likely to be able to do on someone else's system. I can't say for sure, but I believe that I was the one to modify the code to use the "T" display, so that Chess could be run without any special system modifications. I had to give up one or two fancy display features, but generally, it worked pretty well. > The Cyber 73 had two main CPUs, and 20 PPUs (10 for each CPU). The > CPUs were essentially 6600-design, with some enhancements for certain > types of vector operations, as well as dealing with shared main memory. Small nit, Rick. Depending on the model, the 73 was either a 6400 or 6500 (2 CPU) machine. It was the Cyber 74 that was the 6600 10- functional-unit system. You can check Bitsavers for the docs, but I'm certain of it. The "vector extension" wasn't really one--it was called the "Compare/Move Unit" or CMU. It really didn't do much other than give one the ability to perform non-word aligned moves and compares. It had no arithmetic capabilities (other than the compare). Really, no practical performance benefit on the 6600/74, but it made a difference on the serial-issue 6400/73. The fly in the ointment was that while it was standard on the 73, it was not available on the 74. In the COBOL run-time library, we had some fancy code worked out by Rick James that would check for the CMU (which was triggered by a no-op (46 opcode) with some nonzero bits in the normally-zero operand field. Detecting the thing was interesting. You couldn't say that "if it's not a Cyber 74/6600, then there's a CMU", since you still had the issue that the 6400 and 6500 didn't have it either. The technique was to code a word so that the first parcel was a CMU instruction (didn't matter what flavor), the second parcel was a no-op (46000) and the third and fourth parcels contained an uncondition jump. If a CMU was present, the next instruction would be taken from the next word; if not present, >from the succeeding parcels, which would cause the jump to be taken. Worked just fine until some idiot at Arden Hills decided to work up an FCO to the Cyber 74 to trap "CMU not present". Sigh--after that, it was determined as part of deadstart. Cheers, Chuck

18 years

Big fat resistor question

by lee＠geekdot.com

> From the description of the resistor style, can anyone tell > what the wattage might be? A WW2 should be 2.4W. The wattage is n*1.2 Lee.

18 years

Two recent vintage computer sightings in movies

by sellam＠vintagetech.com

Two more sightings of vintage computers in old movies to report. Has anyone seen these already? I was watching This Is Spinal Tap (in-flight movie) for a bit and there is a scene where they're on the tour bus and some dude is playing Missile Command on a TRS-80 Color Computer (the original gr[ea]y model). Right now I'm watching TV (hotel cable) and George Carlin is on (AWESOME!!) and in his set there's an original Macintosh (or it could be a 512 or Plus) in the background. I don't know the name of this set. Isn't someone maintaining a list of these somewhere? -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

18 years

Beginner's capacitor question

by cclist＠sydex.com

Date: Mon, 14 Apr 2008 22:39:35 -0500 From: Tom Peters > You're recording the output of a 5150?? You mean the original IBM PC? Have > we forgotten how the PC generated audio, until real audio cards were > generated? They just toggled a line connected to the speaker-- thereby > pumped square waves at it. Squarewaves are rich in harmonics, and sound > very harsh. They were reliant on the fixed response of the speak to smooth > it out mechanically. Recording that properly will be pretty hard. You need > an RC filter to try and smooth that out, and I'm not sure what that would > look like. Probably a capacitor from the hot lead to ground, with > resistor in the hot lead before the cap. It's still going to be harsh. I'll humbly submit that I believe that Tom has hit the nail on the head, even if he wasn't aiming for it. :) That little speaker in the 5150--and the 5150 case itself--is as much a part of the "sound" as the brutally simple circuitry driving it. If one wants to record the "authentic" 5150 sound, it might be better to use a microphone and place the power supply and any hard disks outside the case to reduce background noise. Cheers, Chuck

18 years

Sirius1/Victor 9000 - has anyone ever seen one working?

by jplist2007＠kiwigeek.com

A very generous chap here (thanks Steve) sent me a bunch of media for my Victor 9000, as I've had no bootable software for it. Most of the new disks are application programmes, but there's one labelled: SYSGEN 5/20/82, CP/M 86 2.2, BACKUP Which I figure should be on the money (although, admittedly, I've never used CP/M before, so I may have it wrong). The Victor has a pair of Tandon TM100-3's, which as far as I can find online are SS/DD - and the diskettes I have are also labelled SS/DD, so that lines up. I have read (in the Vector Tech Ref, thanks BitSavers) that the machine will boot from either diskette drive, which is good since the drive latch mechanism on my left-hand drive is damaged and won't allow the drive to engage. Anyways. I stick in the CP/M floppy and hit the switch. The VDU warms up and, after it checks out the disk drive with the floppy in it, I get a cute little floppy disk logo in the bottom-right hand corner of the screen and next to it is "x 01", as in, "disks times one". From there, nothing. I've tapped all the keys on the keyboard without any apparent change. If I remove the floppy the disk with 'x 01' disappears and I get a blinking floppy logo, so it certainly appears functional in that respect. The Tech Ref manual on BitSavers tells me how to low-level access graphics and helpful things like that - but I need the "Victor9000 for Dummies" guide to tell me what in the heck I'm even looking at. Can anyone help? Thanks much! - JP Iowa

18 years

CEPC s-100 serial card

by jefferwin＠gmail.com

A question for the S-100 experts out there. I have come across a serial I/O card that has 4 serial ports on it. The only markings on the card are: C.E.P.C. 4-SIO-2 Rev 2A The board is in excellent condition. I know of most of the sites that house documentation for the S-100 cards, but I cannot figure out what manufacturer CEPC is. Any clues as to what this card is and where I can find docs for it? Jeff Erwin

18 years

Big fat resistor question

by ethan.dicks＠usap.gov

Hi, all, I'm looking to throw in a current limiting resistor on an LED backlight for an LCD. I'm going through my stash of parts and fished out some power resistors of a style I'm not familiar with. I think they might be suitable, but I can't tell for certain. The LED backlight pulls about 800mA @ 4.2V. The resistors I have are marked "WW2 4 Ohms 5%". The body is about the size of a 1/2W carbon- omposite resistor, all black, with the legend in white paint. I'm guessing that the "WW" means wire-wound, but the resistor looks a little small for me to be sure that "2" might mean 2W (even though I only need 1W). >From the description of the resistor style, can anyone tell what the wattage might be? Thanks, -ethan -- Ethan Dicks, A-333-S Current South Pole Weather at 14-Apr-2008 at 23:20 Z South Pole Station PSC 468 Box 400 Temp -71.0 F (-57.2 C) Windchill -109.6 F (-78.7 C) APO AP 96598 Wind 12.5 kts Grid 84 Barometer 682.6 mb (10530 ft) Ethan.Dicks at usap.gov http://penguincentral.com/penguincentral.html

18 years

cctech Digest, Vol 56, Issue 17

by michaelgreen42＠comcast.net

I've got a xceed setup I've been trying to figure out what to do with. Might just end up on Ebay. -----Original Message----- From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org] On Behalf Of cctech-request at classiccmp.org Sent: Monday, April 14, 2008 10:01 AM To: cctech at classiccmp.org Subject: cctech Digest, Vol 56, Issue 17 Send cctech mailing list submissions to cctech at classiccmp.org To subscribe or unsubscribe via the World Wide Web, visit http://www.classiccmp.org/mailman/listinfo/cctech or, via email, send a message with subject or body 'help' to cctech-request at classiccmp.org You can reach the person managing the list at cctech-owner at classiccmp.org When replying, please edit your Subject line so it is more specific than "Re: Contents of cctech digest..." Today's Topics: 1. Re: Help with ICL power supply fault (Farnell SMPS) (Tony Duell) 2. Re: Mac Plus ozone? (Curtis H. Wilbar Jr.) 3. Re: Schematics and description of an acoustic memory (1k byte, Display terminal, 1969) (pichotjm) 4. RE: modern switching power supply faults (dwight elvey) 5. Re: pcmcia gpib on govliquidation (Richard) 6. Re: govliq: HP-1000 (Mechanicsburg, PA) (Richard) 7. Re: IBM 6094 Lighted Programmable Function Keypad - bulk buy on eBay (Paxton Hoag) 8. Re: Mac Plus ozone? (Chuck Guzis) 9. Re: modern switching power supply faults (Tony Duell) 10. looking for replacement parts - 74S01, 74S73, 2518, 2533 (Eric Smith) 11. Re: looking for replacement parts - 74S01, 74S73, 2518, 2533 (Eric Smith) 12. Re: Schematics and description of an acoustic memory (1k byte, Display terminal, 1969) (Eric Smith) 13. Re: Seeking Xceed Color30 card (Jeff Walther) 14. Re: Seeking Xceed Color30 card (David Griffith) 15. Bay Area collection viewing? (William Donzelli) 16. Re: Seeking Xceed Color30 card (Cameron Kaiser) 17. Big, heavy HP 7974 tape drive at BDI (Bob Rosenbloom) 18. RE: OK, now this is impossible (11/23+ and RL02-RLV12 problem) (Bob Armstrong) 19. RE: modern switching power supply faults (dwight elvey) 20. Re: Seeking Xceed Color30 card (Teo Zenios) 21. Re: looking for replacement parts - 74S01, 74S73, 2518, 2533 (Grant Stockly) ---------------------------------------------------------------------- Message: 1 Date: Sun, 13 Apr 2008 17:41:42 +0100 (BST) From: ard at p850ug1.demon.co.uk (Tony Duell) Subject: Re: Help with ICL power supply fault (Farnell SMPS) To: cctalk at classiccmp.org Message-ID: <m1Jl5H0-000IxtC at p850ug1> Content-Type: text/plain > If you don't mind losing your second channel, you can always apply one input > to channel A and the ground reference to channel B, then set the scope to > "A-B" mode (ChA subtract ChB). Most scopes can do this, and this is exactly > what it's meant for. If you do this, make sure the 'scope can stand a 'common mode voltage' of a few hundred volts, because that's what it's going to be seeing. I would think a fair number of 'scopes will not be happy looking at a signal of a few volts (so the Y attenuators are set to, perhaps, 1V/cm) with a common mode voltage of the full mains. -tony ------------------------------ Message: 2 Date: Sun, 13 Apr 2008 09:32:36 -0400 From: "Curtis H. Wilbar Jr." <rescue at hawkmountain.net> Subject: Re: Mac Plus ozone? To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Message-ID: <48020B74.1000206 at hawkmountain.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed John Robertson wrote: > Curtis H. Wilbar Jr. wrote: >> >> I was given a Mac Plus a while back... and never tested it.... >> >> Decided to give it a quick test... >> >> Other than needing a boot floppy which I'll have to dig up.... it >> powers on, video >> looks good, monitor is stable and all... >> >> But there is a faint sound (think of it as a cross between crickets >> chirping and clicks) >> and after a while, it smells to me a bit like ozone at the top of the >> Mac. >> I'm thinking maybe high voltage leakage ? >> >> Anyone have any experiences with these old Macs that can point me at >> what to look >> for ? >> >> It might well be OK as it is... but I don't want to risk damage >> occuring as other >> than a few dings and scrapes and a bit of yellowing, it is in >> remarkable condition. >> >> -- Curt >> >> >> > Ozone smell is just the high voltage at work. A slight leakage that > may indicate moisture or excessive dust on the monitor where the HV > lead clips to the side of the picture tube. You might be able to > reduce the smell by opening the case and (after waiting 24 hours to > discharge) clean the glass around the HV Anode clip (may have a rubber > disc protecting the clip) with a red (usually red) fat insulated wire > coming out of the picture tube cone. There is a special coating on the > tube that starts about 2 inches away from the anode clip and coats the > glass cone - do not remove or damage this if possible. It is 1/2 of > the capacitor element of the picture tube Lyden jar type capacitor. Called DAG I believe. I'll have to open this up, probably check it out in a dark room, then I can always discharge with my hv meter or wait patiently for at least a day (and then double check with the hv meter :-) ). > > Alternatively the flyback could be damp or filthy with dust. This is > found at the other end of the fat wire (normally red) leading from the > cone of the picture tube. You can wipe it with a damp cloth, taking > particular care not to rotate or move it relative to the frame - as > this will break wires and cause it to fail. Most flybacks are solid > enough that this is not a concern but in my early B&W video game > monitors the flyback coil was not well secured and subject to failure > from being turned or twisted whilst cleanig or just day to day > bouncing around... > which B&W video games ? Vectors or Rasters ? I have an Asteroids I haven't repaired yet. (I have around 12 vids, aprox half rasters, half vectors) I am the 'repair shop' for them (but sadly get very little time, so several or awaiting repair). Currently (off topic, but possibly of interest to some) on the repair room floor: Star Wars (mathbox probs), Rip Off (sound problems), Tempest (flakes out with large vectors and crashes randomly, might be bad ram socket from a ram someone replaced), Major Havoc (mainboard problems, to be built into a Tempest cab), Xevious (the dreaded Matsushita monitor is slewing video at the edge of the (rotated) screen), and I'm sure I'm forgetting a couple. My Joust leaks HV... I think the DAG coating has become damaged (flaked off, or partially 'cleaned' off by someone). Especially if there is moisture in the air, it crackles, and IIRC I observed a faint lighting show around the DAG coating. I believe you can get a coating to redo the DAG, but I haven't researched that far yet. OK.. enough off topic (hrm... maybe not too of topic.. they are essentially computers :-) ). -- Curt > John :-#)# > ------------------------------ Message: 3 Date: Sun, 13 Apr 2008 16:02:08 +0200 From: "pichotjm" <pichotjm at free.fr> Subject: Re: Schematics and description of an acoustic memory (1k byte, Display terminal, 1969) To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> Message-ID: <014b01c89d6e$f70fcb70$2601a8c0 at JM3800> Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=original > Jean-Marie Pichot wrote: >> This display terminal was designed in 1969, [...] Remember, >> in that time, there are no micro-processor, neither RAM chips! It was just to remind the common design context in 1969. There were some registers for computers or military products. I have many young readers... > There were RAM chips in 1969. Most of them stored 16 bits or > less. I have not been able to determine when the first 64-bit RAM > appeared, but it might have occurred by then. Are they named RAM in databooks? or registers? I think i have one, 4 bits but without adress decoding. There are 4 register selects! > Examples of RAM chips available in 1969 were the Fairchild U6A903059X > 8-bit RAM and U6A903359X 16-bit RAM. The base part numbers were 9030 > and 9033, respectively. These were part of the CTuL Complementary > Transistor Logic (CTuL or CTL) family. Don't get confused by that > name; these were complementary *bipolar* transistors, not CMOS. Many > years later Fairchild reused the CTL abbreviation for something entirely > different, Current Transistor Logic. > By the time of the 1972 Fairchild TTL Data Book, the 9033 designation > was changed to 93433. > > The 9030 was used in the KM10 fast memory "option" for the DEC KA10, the > first PDP-10 processor, designed in 1967. Interesting! > For a raster display terminal in 1969, delay line memory was obviously > more practical than semiconductor memory, since the density of available > RAM chips was too low. This started to change in 1970 when Intel > introduced the 1101 static RAM (256 bit) and the 1103 dynamic RAM > (1024 bit), though there were initially a lot of reliability problems > with the latter. I have a lot of MK4007 by Mostek. 256x1 i think similar to the 1101 by Intel. They are used in the Beryllium board: http://pichotjm.free.fr/1975-1980/Beryllium/PICT8117.html > The next generation of raster display terminals used MOS dynamic > shift register memory, which was less expensive than RAM. As far > as I'm aware, not many display terminal designs used RAM chips before > 1977, and MOS shift registers were still being sold into the mid 1980s. I have specification of a 32x4 bit shift register from RTC (FDN 106, 240.00 francs/1 # $50/1) dated 1970. Other specs are for 256x4 512x2 and 1024x1 but unusable for raster scans. In that time (1970) i remember to ask a company to develop a custom 80x8... but the cost was too heavy. Btw, i have specs of TTL used in that design, if anybody need them... (in french!) JMP ------------------------------ Message: 4 Date: Sun, 13 Apr 2008 07:16:31 -0700 From: dwight elvey <dkelvey at hotmail.com> Subject: RE: modern switching power supply faults To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <BAY138-W132E3CC76D9E194B50669DA3E90 at phx.gbl> Content-Type: text/plain; charset="iso-8859-1" > Date: Sun, 13 Apr 2008 00:56:47 -0400 > From: rescue at hawkmountain.net > To: cctalk at classiccmp.org > Subject: modern switching power supply faults > > > I have two Dell switchers out of P4 based 1U servers. > > The first one has a failure in the startup circuit... pressing the power > button will > lead to a flash of the power light... and that's it. > > The second one failed spectacularly.... > Hi I to have a problem with one. It is similar to your first one. Basically, the first problem is that something is failing to start the switcher feedback. What happens on powerup is that it is given one kick. This gets the 12v going to the regulator circuit. It is then suppose to send pulses through the pulse transformer to fire the switching transistors. It could be most anything in the regulation loop. I fixed one in the past when I found an open wire in the pulse transformer. Still, it could have been anything in the feedback path, including regulator ICs, filter caps, diodes, resistors, etc. Mine is failing on a load related problem. As I connect more load, it fails to powerup. It is funny that it seem to be more sensitive to the loads that use the 12V. It seems to run the 5V loads fine. Your second one has most likely had a failed switching transformer and switching transistor. There could also be a load issue, such as shorted rectifier diodes on the secondary but that is unlikely. This would tend to keep the 12V from coming up and you'd get no pulses to fire the switching transistors. They're unlikely to fail if not turned on. Dwight _________________________________________________________________ More immediate than e-mail? Get instant access with Windows Live Messenger. http://www.windowslive.com/messenger/overview.html?ocid=TXT_TAGLM_WL_Refresh _instantaccess_042008 ------------------------------ Message: 5 Date: Sun, 13 Apr 2008 11:23:14 -0600 From: Richard <legalize at xmission.com> Subject: Re: pcmcia gpib on govliquidation To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <E1Jl5v9-000256-00 at xmission.xmission.com> In article <4801AC99.4050300 at Rikers.org>, Tim Riker <Tim at rikers.org> writes: > Is there any way to contact those who win an auction on govliquidation? Nope. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/> ------------------------------ Message: 6 Date: Sun, 13 Apr 2008 11:24:28 -0600 From: Richard <legalize at xmission.com> Subject: Re: govliq: HP-1000 (Mechanicsburg, PA) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <E1Jl5wK-0002A7-00 at xmission.xmission.com> In article <200804130758.05630.rtellason at verizon.net>, "Roy J. Tellason" <rtellason at verizon.net> writes: > On Saturday 12 April 2008 23:42, Richard wrote: > > <http://cgi.govliquidation.com/auction/view?id=3D1675504&convertTo=3DUS= > D> > > > > Buried in a giant lot of other stuff, 17 pallets, 7000 lbs. > > I'm local to this, though currently hauling 17 pallets is a bit beyond m= > y=20 > capabilities. :-) You can enquire through the location if they allow you to haul it away incrementally, otherwise I guess you have to rent a truck and manually unpack it from the pallets into the truck. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/> ------------------------------ Message: 7 Date: Sun, 13 Apr 2008 10:44:06 -0700 From: "Paxton Hoag" <innfoclassics at gmail.com> Subject: Re: IBM 6094 Lighted Programmable Function Keypad - bulk buy on eBay To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <ded268c40804131044p1b41db1am5233047d3099642f at mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 > Did anybody purchase one of these? How about getting it to work on a > machine with a serial port not running AIX? I got both lots. There were 11 people interested and I have filled about 7 of the orders as people pay me for what they want. If you are still interested let me know at paxton.hoag at gmail.com. I have not tinkered with one except to take one with a broken key apart. Parts available if needed. I still have a lot of them. Pax -- Paxton Hoag Astoria, OR USA ------------------------------ Message: 8 Date: Sun, 13 Apr 2008 11:03:19 -0700 From: "Chuck Guzis" <cclist at sydex.com> Subject: Re: Mac Plus ozone? To: cctalk at classiccmp.org Message-ID: <4801E877.150.EBB4D0D at cclist.sydex.com> Content-Type: text/plain; charset=US-ASCII Date: Sun, 13 Apr 2008 09:32:36 -0400 > From: "Curtis H. Wilbar Jr." I believe the proper name for the water-based colloidal graphite suspension used to coat CRT surfaces is "aquadag". "Dag" is probably just a shortened form. Aquadag paint for repair should still be available. Some old HOTs (horizontal output transformers/flyback transformer) in CRT HV supplies develop cracks in the potting material with age and sometimes expose the connection of the winding to the HV anode lead. This can cause a corona discharge and the ozone smell. There can also be arcing from the HV lead to the chassis. A lights-out inspection will sometimes yield the telltale purple glow of corona discharge. Often, the discharge can be heard by young ears as a "hissing" sound. Good old red glyptal HV dope is the most commonly prescribed cure for insulation failures. I think GC still sells the stuff. Cheers, Chuck ------------------------------ Message: 9 Date: Sun, 13 Apr 2008 17:51:44 +0100 (BST) From: ard at p850ug1.demon.co.uk (Tony Duell) Subject: Re: modern switching power supply faults To: cctalk at classiccmp.org Message-ID: <m1Jl5Qh-000IxvC at p850ug1> Content-Type: text/plain > > > I have two Dell switchers out of P4 based 1U servers. > > The first one has a failure in the startup circuit... pressing the power > button will > lead to a flash of the power light... and that's it. > > The second one failed spectacularly.... > > There is a wire wound power resistor (5W15RJ) near the AC input... it > cooked... Di U deduyce from that marking that it's a 15 Ohm resistor? Is it possibly part of a soft-start circuit, to be shorted out by a triac or similar once the supply has got going. If so, then if that fails and the resistor is left in circuit, it will overheat. There have been supplies where there's a startup resistor -- to power the control circuitry until the rest of the supply gets going -- which would overheat if said supply took too long to get goiog. The resistor simply couldn't power the circuitry for long on its own. But I would expect such a resistor to be a lot more than 15 ohms > and I do mean cooked. It came out in pieces (with almost no effort), > melted the > nearby capacitor and a nearby relay. It also did a pretty good job of > puckering/burning > the PCB (but not bad enough it could not be used). What is that relay connected to/used for? It doesn't short out the reistor by any chance as part of a soft-start circuit, does it? > > I suspected maybe shorted primary full wave rectifier... but I used the > DVM on > diode test and got what I'd expect. > > Oddly, despite there being a fuse on the primary side... it's still > good... it wasn't > taken out. > > That resistor got hot hot hot. Could that resistor have failed on it's > own ? > I suspect something further down the circuit must have a problem. > > I'd be happy if I could make one power supply out of the two. These are not > simple supplies however. While much of the switching transistors, > regulators, > bridge rectifiers, capacitors and the usual fair in a switcher are > pretty readily > identified, there is a 6" x 1" "brain" board (I'll call it that as it > has adjustment > pots, the ps fan circuit, quite a # of surface mount components on both > side of > it, and it interfaces with the main PCB with 34 connections. > Any recognisable chips on that board? FWIW, there have been some very complicated SMPUs in classic machines. The HP9845B, a complicated machine in all respsects, has a PSU on a 3-dimentional sculpture of PCBs, with 4 chopper transistors, 2 main chopper transformes, and IIRC 17 ICs on the control PCB. -tony ------------------------------ Message: 10 Date: Sun, 13 Apr 2008 22:58:10 -0700 (PDT) From: "Eric Smith" <eric at brouhaha.com> Subject: looking for replacement parts - 74S01, 74S73, 2518, 2533 To: cctalk at classiccmp.org Message-ID: <34656.68.121.162.227.1208152690.squirrel at ruckus.brouhaha.com> Content-Type: text/plain;charset=iso-8859-1 It was recently asserted here that TTL parts aren't hard to find, but I'm having a heck of a time finding the 74S01 and 74S73. As far as I can tell from the data sheets, the 74S103 is functionally and pin-compatible with the 74S73, but a little faster. I wouldn't mind substituting that, but it doesn't seem any easier to find. The 74S03 and 74S107 are non-pin-compatible replacements for the 74S01 and 74S73, but I'd much prefer to stick with pin-compatible parts. I'm also looking for the 2518 and 2533 shift registers. The 2518 is a hex 32-bit static shift register, and the 2533 is a 1024-bit static (not dynamic!) shift register. The original parts were Signetics, but I don't mind using other sources: Signetics 2518 2533 TI TMS3122 TMS3133 Fairchild 3349 3533 National - MM5058 GI - 2533 AMD - Am2833 Eric ------------------------------ Message: 11 Date: Mon, 14 Apr 2008 00:36:42 -0700 (PDT) From: "Eric Smith" <eric at brouhaha.com> Subject: Re: looking for replacement parts - 74S01, 74S73, 2518, 2533 To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <39040.68.121.162.227.1208158602.squirrel at ruckus.brouhaha.com> Content-Type: text/plain;charset=iso-8859-1 Grant wrote: > Unicorn Electronics can get all of those ICs, but you'll have to > order a minimum quantity. None of them (other than the 74S03, which has the wrong pinout) are listed on their web site. If you mean that they can deal with parts brokers at my request, I've tried dealing with the parts brokers myself, and had poor results. I'm willing to place an order for $250 total, but not for $250 for each line item, which seems to be the minimum the brokers are willing to consider. Eric ------------------------------ Message: 12 Date: Mon, 14 Apr 2008 00:51:33 -0700 (PDT) From: "Eric Smith" <eric at brouhaha.com> Subject: Re: Schematics and description of an acoustic memory (1k byte, Display terminal, 1969) To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <45219.68.121.162.227.1208159493.squirrel at ruckus.brouhaha.com> Content-Type: text/plain;charset=iso-8859-1 JMP wrote: > Are they named RAM in databooks? or registers? The Fairchild 9030 and 9033 are described in the databook as an "8 Bit Memory Cell" and "16 Bit Memory Cell", respectively. They're obviously read/write memory that is randomly addressable, so they are RAM. I'm not sure about the 9030, but the 9033 uses "coincident select", like core memory. You provide a decoded one-of-four row address and a decoded one-of-four column address. "As many as four locations may be addressed simultaneously without destroying stored information." It was common for early RAM chips not to use a linear address. Those that did were often described as "fully decoded RAM". The 9033 is thus a "not fully decoded RAM". Eric ------------------------------ Message: 13 Date: Sun, 13 Apr 2008 14:02:37 -0500 From: Jeff Walther <trag at io.com> Subject: Re: Seeking Xceed Color30 card To: cctech at classiccmp.org Message-ID: <a04310101c42801b57c55(a)[192.168.1.10]> Content-Type: text/plain; charset="us-ascii" ; format="flowed" >Date: Sat, 12 Apr 2008 15:04:29 -0700 (PDT) >From: David Griffith <dgriffi at cs.csubak.edu> >On Sat, 12 Apr 2008, Jeff Walther wrote: >> Now, it really shouldn't be that hard to whip something up with an >> FPGA and either some fastish SRAM or an open core DDR2 controller and >> one DDR2 memory chip. >How far did you get with this project? I'd love to see something that >just does greyscale. That and smaller modern parts would allow a lot more >to be crammed into that PDS slot. I would say I'm still in the conceptual stage. I've examined the Is and the Os in the documentation and I pretty much know what I want to build, with a few choices still remaining (e.g. SRAM vs. DDR2). But I'm stymied by the details and by the fact that when I started this I was unemployed and had time, although my motivation was low due to the associated emotional challenges. Now I am wonderfully employed, and very happy, but have very little spare time. I've read through "Designing Cards and Drivers for the Macintosh" (IIRC) but I need to go through in more detail and draw a diagram of the ROM structure. But it seems to me that some of what I need to know is in Inside Macintosh and extracting those tidbits is difficult (for me). Also, some of the information I want to examine is contained in Pascal coding examples, and I don't know Pascal. It will be easy enough to pick up, but it's another step back from the actual project. Of course, all of the Apple documentation assumes that the audience is already an expert at building the component they want to build and only needs the Apple specifics, and I've never designed a video card. I haven't found any kind of book about it anywhere. I picked up whatshisnames book about the video typewriter and the follow up book, but it doesn't seem quite applicable to this application. So I'm in one of those situations where I need bits of information in order to truly understand other bits of information. But I don't know in what order I really need the bits in order to make them comprehensible. Worse, I don't actually know which piece will be in which resource. So I need to find all the pieces of information, fail to understand them as I find them, but identify them, then after they've all been found, reorder them and go back, this time in logical sequence and put it all together. Maybe if I was smarter, one pass would be enough... I'm somewhere late in the finding all the pieces without understanding them yet stage, paused just before doing a quick learn of Pascal so I can examine/understand the examples in Inside Macintosh. But I still lack a resource on the finer points of video card design. I understand the basic fucntion, but there are always details which clever people have worked out, which a latecomer like me can greatly benefit from. For example, the various schemes to avoid drawing the top half of the screen and then using changed data for the bottom half of the screen. I'm familiar with the simple expedient of having two screen buffers. But I understand that there are more elegant solutions in use, otherwise video cards would need twice as much VRAM. Is it really all about tracking updates as they come in and only allowing ones which are earlier in the buffer than the current draw point, and delaying the others until the drawing point passes? If so, one would either hold up the host system, or need an additional buffer for the delayed changes. Yes? No? As far as cramming a lot more into the PDS slot with smaller components... Yes, the thing holding folks back is the time and skill to code, not the available technology. Taken to its logical conclusion, we would take a moderate sized FPGA, emulate the 68030 and FPU on board, put a fast memory interface on the FPGA, add a USB2 chipset and fast ethernet I/O, plus an ATA interface and video outputs, then just use the SE/30 board as an I/O peripheral and home to the Apple ROM, with the built-in 9" screen as one display and a connector for a large color display if desired. Alternatively, use a Coldfire MCU, patch the unimplemented 68030 instructions with the exception handler (there's a library at Freescale for this) and then copy the basic design of the Daystar CPU upgrades which already worked out how to put a faster 68030 into the PDS slot. With a little more work patching the firmware, one could use a Coldfire with built in USB and ethernet, but that's a lot more software work. One also loses the FPU functionality, and if your code calls many of the unimplemented instructions it could be pretty slow. But all those projects are dauntingly large. For now, I'd like a video card. Later, an ATA interface. Maybe USB after that, but frankly, without a more skilled programmer's help, I don't think I will be able/willing to write USB drivers. Eventually, it could all go on one card. Jeff Walther ------------------------------ Message: 14 Date: Sun, 13 Apr 2008 14:02:26 -0700 (PDT) From: David Griffith <dgriffi at cs.csubak.edu> Subject: Re: Seeking Xceed Color30 card To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Cc: cctech at classiccmp.org Message-ID: <Pine.GSO.4.55.0804131400030.5772 at helios.cs.csubak.edu> Content-Type: TEXT/PLAIN; charset=US-ASCII On Sun, 13 Apr 2008, Jeff Walther wrote: > For now, I'd like a video card. Later, an ATA interface. Maybe > USB after that, but frankly, without a more skilled programmer's > help, I don't think I will be able/willing to write USB drivers. > Eventually, it could all go on one card. I wonder how much trouble it would be to figure out what's inside that custom chip that Micron used. Suitable SCSI drives are fortunately still readily available. I don't think USB was ever available for System 6. -- David Griffith dgriffi at cs.csubak.edu A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail? ------------------------------ Message: 15 Date: Sun, 13 Apr 2008 19:09:22 -0400 From: "William Donzelli" <wdonzelli at gmail.com> Subject: Bay Area collection viewing? To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <e1d20d630804131609lfc4c4e0rf8f7df4c11f28662 at mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Once again, this year I will be in the Bay Area for a few days, basically most of the week of the 4th of May. In the past, a couple of computer collectors opened their doors to me and did a show and tell. Once again, thank you much. So, does anyone else want to show of their machines to an East Coast weenie? Remember, bigger is better. Microcomputers are only shims for real computers. Computers with big blue skins are extra cool. Old is good. Let me know as soon as possible. I will have some email access as I cross the country, but I always like to have things planned out before I leave my driveway. -- Will ------------------------------ Message: 16 Date: Sun, 13 Apr 2008 17:38:39 -0700 (PDT) From: Cameron Kaiser <spectre at floodgap.com> Subject: Re: Seeking Xceed Color30 card To: cctalk at classiccmp.org Message-ID: <200804140038.m3E0cd9d012732 at floodgap.com> Content-Type: text/plain; charset=US-ASCII > > For now, I'd like a video card. Later, an ATA interface. Maybe > > USB after that, but frankly, without a more skilled programmer's > > help, I don't think I will be able/willing to write USB drivers. > > Eventually, it could all go on one card. > > I wonder how much trouble it would be to figure out what's inside that > custom chip that Micron used. Suitable SCSI drives are fortunately still > readily available. I don't think USB was ever available for System 6. I don't believe I have ever seen USB drivers for System 7 either. -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- Once used rectally, [it] should not be used orally. --Real thermometer label ------------------------------ Message: 17 Date: Sun, 13 Apr 2008 18:25:10 -0700 From: Bob Rosenbloom <bobalan at sbcglobal.net> Subject: Big, heavy HP 7974 tape drive at BDI To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Message-ID: <4802B276.9000503 at sbcglobal.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed See: http://www.auctionbdi.com/getpictures.asp?aucid=100131 Bidding ends tonight so if anyone's interested..... Bob ------------------------------ Message: 18 Date: Sun, 13 Apr 2008 19:21:11 -0700 From: "Bob Armstrong" <bob at jfcl.com> Subject: RE: OK, now this is impossible (11/23+ and RL02-RLV12 problem) To: "'General Discussion: On-Topic and Off-Topic Posts'" <cctalk at classiccmp.org> Message-ID: <000001c89dd6$354537b0$9fcfa710$@com> Content-Type: text/plain; charset="us-ascii" >It's not that. XXDP runs fine with an RLV12. Thanks, Pete, Guy and Lyle (who phoned me) for the suggestions. After some poking around and much time spent peering into dark corners with a flashlight, it turns out that the RLV12 is the source of the problem. I managed to borrow another RLV12 board and that one works fine, for both RSX and XXDP. So, option #1 is that the first RLV12 is just bad, although oddly so as it apparently works for RSX but not XXDP. However, I notice that the working RLV12 has a couple of ECO wires on it that are absent from the "non-working" RLV12, and I can't help but wonder if that has something to do with it. Does anybody know the ECOs for the RLV12/M8061 and whether they have any bad effects on XXDP? Thanks again, Bob ------------------------------ Message: 19 Date: Sun, 13 Apr 2008 19:59:20 -0700 From: dwight elvey <dkelvey at hotmail.com> Subject: RE: modern switching power supply faults To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <BAY138-W334CC3BC797AA074CDA546A3E80 at phx.gbl> Content-Type: text/plain; charset="Windows-1252" > From: ard at p850ug1.demon.co.uk ---snip--- > > FWIW, there have been some very complicated SMPUs in classic machines. > The HP9845B, a complicated machine in all respsects, has a PSU on a > 3-dimentional sculpture of PCBs, with 4 chopper transistors, 2 main > chopper transformes, and IIRC 17 ICs on the control PCB. Hi Tony I have a HP 21mx. The switcher in there is one of the most complicated that I've ever seen. When I first got it, it took me a while of studying the schematics before I realized it needed the resistor that was suppose to be the thermal sense in the battery pack. This group was great in helping get the right value and connector. I think the switcher the fellow is looking at is the typical type used in most PC's. It does sound like he may be able to get enough parts to put together a working PS. It is at least worth a try. Both cases may have issued in the primary side though. Dwight _________________________________________________________________ Pack up or back upuse SkyDrive to transfer files or keep extra copies. Learn how. hthttp://www.windowslive.com/skydrive/overview.html?ocid=TXT_TAGLM_WL_Refres h_skydrive_packup_042008 ------------------------------ Message: 20 Date: Mon, 14 Apr 2008 01:56:55 -0400 From: "Teo Zenios" <teoz at neo.rr.com> Subject: Re: Seeking Xceed Color30 card To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> Message-ID: <000801c89df4$5897bee0$c600a8c0 at game> Content-Type: text/plain; charset="iso-8859-1" ----- Original Message ----- From: "Cameron Kaiser" <spectre at floodgap.com> To: <cctalk at classiccmp.org> Sent: Sunday, April 13, 2008 8:38 PM Subject: Re: Seeking Xceed Color30 card > > > For now, I'd like a video card. Later, an ATA interface. Maybe > > > USB after that, but frankly, without a more skilled programmer's > > > help, I don't think I will be able/willing to write USB drivers. > > > Eventually, it could all go on one card. > > > > I wonder how much trouble it would be to figure out what's inside that > > custom chip that Micron used. Suitable SCSI drives are fortunately still > > readily available. I don't think USB was ever available for System 6. > > I don't believe I have ever seen USB drivers for System 7 either. > I think Mac OS 8.5/8.6 was the 1st to enable USB support. ------------------------------ Message: 21 Date: Sun, 13 Apr 2008 23:28:20 -0800 From: Grant Stockly <grant at stockly.com> Subject: Re: looking for replacement parts - 74S01, 74S73, 2518, 2533 To: "General Discussion: On-Topic Posts Only" <cctech at classiccmp.org> Message-ID: <0JZB00JP30R4OIA0 at msgmmp-1.gci.net> Content-Type: text/plain; charset=us-ascii; format=flowed At 09:58 PM 4/13/2008, you wrote: >It was recently asserted here that TTL parts aren't hard to find, but >I'm having a heck of a time finding the 74S01 and 74S73. > >As far as I can tell from the data sheets, the 74S103 is functionally >and pin-compatible with the 74S73, but a little faster. I wouldn't mind >substituting that, but it doesn't seem any easier to find. > >The 74S03 and 74S107 are non-pin-compatible replacements for the 74S01 >and 74S73, but I'd much prefer to stick with pin-compatible parts. Unicorn Electronics can get all of those ICs, but you'll have to order a minimum quantity. http://www.unicornelectronics.com/prod.htm End of cctech Digest, Vol 56, Issue 17 **************************************

18 years

XXDP

by lbickley＠bickleywest.com

On Monday 14 April 2008 08:07, Bob Armstrong wrote: > Lyle, > > > > Thanks for the suggestions on the RLV12 - 11/23+. In case you > haven't seen my posting, it turns out that the RLV12 is to blame, > although I don't know exactly what's wrong with it. Just saw it - after reading this ;-) I just checked uNotes through #115 and no mention of this problem w/RLV12 or ECOs. I checked my two spare RLV12/M8061 boards and there are no ECOs on either of them. I have another in a 11/83 - but it's too difficult to get to it to check (moving racks, etc.). The one in my 11/83 runs XXDP 2.5, RT, RSX and RSTS/E w/o any issues. I would be interesting to investigate what the "ECO" is on your RLV12. In your "spare time" how about tracing it out ;-) > BTW, I did try XXDP v2.2 and v2.5 - same results with either. Interesting... Lyle -- Lyle Bickley Bickley Consulting West Inc. Mountain View, CA http://bickleywest.com "Black holes are where God is dividing by zero"

18 years

looking for replacement parts - 74S01, 74S73, 2518, 2533

by grant＠stockly.com

At 11:36 PM 4/13/2008, you wrote: >Grant wrote: > > Unicorn Electronics can get all of those ICs, but you'll have to > > order a minimum quantity. > >None of them (other than the 74S03, which has the wrong pinout) are >listed on their web site. If you mean that they can deal with parts >brokers at my request, I've tried dealing with the parts brokers >myself, and had poor results. I'm willing to place an order for $250 >total, but not for $250 for each line item, which seems to be the >minimum the brokers are willing to consider. Every single part I have bought for my kits has come from Unicorn. Exotic ram, 8008s, L series TTL, 200+ 1702s, etc. TTL L series chips are usually $1 a piece with a 100 quantity minimum. The S series looks cheaper. You'll have to give them a call. The parts brokers in a google search do not have what they list. They buy from someone else and mark the price up.

18 years

Some information on Micron Optic Rams

by jwallis＠fbiacademy.edu

I'm sorry Jim, but I can't answer your last question. However, I do appreciate the extra information you have provided. The information I have received to date has met my requirements. Thank you very much for the offer of additional project sheets. Once again - Thank You. Jane Wallis -----Original Message----- From: Mr. Sub Micron [mailto:nanoman at stny.rr.com] Sent: Friday, April 11, 2008 9:29 PM To: Wallis, Jane ; dave06a at dunfield.com; General Discussion: On-Topic and Off-Topic Posts Cc: nanoman at stny.rr.com Subject: Some information on Micron Optic Rams Jane, If you are interested. As a student (several decades ago) I developed several 64K and 512K DRAM cameras. I used TI and Intel DRAMs (at the time I was unaware of the Micron opticRAM). In its day, I thought this was pretty cool. The DRAM was attached via tether to my computer and I varied the refresh rate to get gray scale. Assembly language is a beautiful thing (or a nightmare). Of course the real trick was to remove the ceramic package lid and polyimide protective "goop" to reveal the chip die imaging surface (without damaging the die). Anyway, I have attached the covers of Mircro IS32 and IS256 information that I readily found. I believe I may still have the MicronEye Camera and Manual, as well as other information. If you would like copies of this information let me know. I will be out of town for a week or so (and I will have to recall where I have stuff the other information). Why are you interested in the OpticRam? Enjoy, Jim

18 years

Schematics and description of an acoustic memory (1k byte, Display terminal, 1969)

by pichotjm＠free.fr

Hi,If there are some electronic enginneers here, they may be interested by this descritption of an alphanumeric display terminal using acoutic delay lines. (used in european TV sets)This display terminal was designed in 1969, and uses 32 TV delay lines as memory! The memory size is 16 rows of 80 characters coded in 6 bit ascii: 1280 words (6 bits)If you are interested, have a look there: http://pichotjm.free.fr/DisplayDL/DisplayDLus.htmlYou will find the complete set of schematics and deep explanations. Remember, in that time, there are no micro-processor, neither RAM chips! Only few gates (or, and, nand, JK flip-flop,...) Sorry, i have no photos of the terminal.As you can read, i have a poor english, you can help me in correcting the text.Have a good trip in 1969.Jean-Marie PICHOT

18 years

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test-drb