- test-drb@ccmp.vtda.org - classiccmp.org

by marvin＠rain.org

I fired up an Altair and found it didn't behave as it should (tested with MITs and Polymorphic CPU cards.) Doing an "Examine" does not load the switch settings into the program counter. Doing an "Examine Next" seems to increment the program counter by 3. The preceeding was done with and without a memory card. I tried the "Deposit" but had no way to see what I was doing since the switch settings apparently weren't being loaded. Finally, the "Deposit Next" increments the LEDs. One other strangeness, when I connect the Data Display cable to the MITS card, the "Stop" switch ceases to function although the "Start" seems to work fine. I do have the schematics and will start to dig into it later this morning. BUT, I was hoping to short circuit some of the troubleshooting time if someone on the list has experienced something like this :). Thanks!

21 years, 8 months

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Cabletron MMAC-M8FNB

by kenziem＠sympatico.ca

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 it is described as Cabletron MMAC-M8FNB chassis populated with 1 MODMIM-4, 1 CRM-2E router, 1 TPRMIM-36 10MB ethernet and an EMM-E6 module. Is this something that might be of interest? All Google seems to find is people selling them. - -- Collector of vintage computers http://www.ncf.ca/~ba600 Open Source Weekend http://www.osw.ca -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) iD8DBQFBDlBeLPrIaE/xBZARAtKJAJ0bIlh8MSyHjkjdPbanO+4+FT+KTgCgkR6J tgIpMwb2wT8LazrksT4pcqM= =uUVQ -----END PGP SIGNATURE-----

21 years, 8 months

2
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Wanted: Side stand for IBM AT

by fernande＠internet1.net

Hi Everyone, Does anybody have an extra side stand for the IBM AT that they would part with? I have never seen one, but it's my understanding that IBM made one for the AT, but most people didn't use them. I'm willing to pay shipping plus a reasonable amount for one in good shape. Chad Fernandez Michigan, USA

21 years, 8 months

2
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Xerox Alto Restoration + Emulation

by jlewczyk＠speakeasy.net

Hi Chandra, I believe there is a project called "altogether" by Eric Smith which is an attempt to emulate the Alto under Unix and X-Windows. http://altogether.brouhaha.com/ - John jlewczyk(a)speakeasy.net

21 years, 8 months

1
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First computer with real-time clock?

by vp＠cs.drexel.edu

Sellam Ismail (vcf(a)siconic.com) wrote: > Does anyone know what was the first computer to have a built-in real-time > clock? I take it you mean non-volatile clock like the M48T02 RTC chips on the early SUN-4 machines. The reason why there is a difference, is that most operating systems (esp. those that have preemptive schedulers) need a regular timer interrupt. So they use that interrupt for their time-of-day clock. This method is generally accurate and convenient since mainframes were not likely to be switched off overnight. Another advantage held by the early mainframes is that they were kept in a stable environment, which meant that their clock keeping was pretty good anyway. The other reason why you don't actually want to read a time of day clock while the OS is running is speed. Why waste time on I/O since the OS can just keep the elapsed time variable updated with a single instruction. UNIX is a good example: when you boot, the OS goes to the RTC, reads the current time and date and converts it to the UNIX time (seconds since 00:00 Jan 1 1970 UTC). From that moment onwards, the OS is making sure that this value is updated so that it is current. When you actually ask for the time, the system (actually the C library) converts the contents of its time-of-day memory location into the calendar date that humans like to see. When you actually want to set the correct time, the system will update its internal time-of-day memory location *and* the RTC so that then next time the system boots, it will have the correct time. BTW, the original PCs did not have a non-volatile clock, which is why MSDOS by default asks for the date and time every time you boot (assuming you do not override it by creating a AUTOEXEC.BAT file). Since many people mentioned various HP calculators and computers with non-volatile clocks, I only want to mention the HP 59309A HP-IB Digital Clock. This is an HP-IB device that returns the current time/date as an ASCII string. SO if your computer did not have a non-volatile clock you could easily add one. **vp

21 years, 8 months

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correct address

by jhfinexgs2＠compsys.to

>JOHN MCCANCE wrote: > good morning jerome, > yes, this remains the correct snail mail address. > and no, i am not tired of waiting. there are always many other > amusements to tend to ;-} Jerome Fine replies: Hi John, I tried to send the following e-mail. but it bounced. I hope this will arrive! After I tried to send this e-mail to you and send a reply to an old e-mail, I am sending it to both you and classiccmp. The classiccmp version leaves the address details omitted, so if that is the only one that reaches you, please fill them in! ============================================ At this point, after many delays - most of which are my fault - I am about to mail the CDs. They are actually ready to be taken to the Post Office to be mailed. I want to check on your address first, so please respond! John W. McCance aaaaaa aaaaaa aaaaaa Thank you for being so patient!!!!!!!!!!!!!!! Sincerely yours, Jerome Fine -- If you attempted to send a reply and the original e-mail address has been discontinued due a high volume of junk e-mail, then the semi-permanent e-mail address can be obtained by replacing the four characters preceding the 'at' with the four digits of the current year.

21 years, 8 months

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Ohio Scientific Challenger 4P/MF

by JMeyer101＠aol.com

Hello Graeme, Thank you! This should help alot. Apparently this computer uses a floppy drive. Do you happen to know where I can pick one up? Thanks again, Jeff Meyer

21 years, 8 months

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Seeking Strawberry Tree or LabTech (Laboratory Technologies) software

by vcf＠siconic.com

Has anyone got any old Strawberry Tree Inc. or LabTech (Laboratory Technologies, now National Instruments) data acquisition software? I've been getting periodic requests for specific software packages from these companies and am hoping I can find some. This is a bounty so this could be worth money. Thanks! -- 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 ]

21 years, 8 months

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Zilog Z8038 Z-FIO document available

by vax3900＠yahoo.com

I copied the Z8038 part from the book "The Z8000 microprocessor, A design handbook" by Bradly, K. Fawcett. I remember that somebody on the list tried to make a collection of zilog chip documents. I'd like to mail the 20 pages to him. Please send me email if it is you. Thanks. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

21 years, 8 months

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Xerox Alto Restoration + Emulation

by cbajpai＠comcast.net

This I find very cool...esp since I scored an Xerox Alto Users handbook (thanks Bob!) at VCF/East. Has anyone every heard of these guys.they seem to up in Canada and are painstakingly restoring an Xerox Alto I since April 2003. AINOTL begins restoration of Xerox Alto 1 April 2003 AINOTL Systems, Inc. (AINOTL) is pleased to announce the restoration of a Xerox Alto 1 computer (1972). Only 200 were hand-made at the Xerox PARC research facility - we have the only one known to exist. The Alto featured the world's first What-You-See-Is-What-You-Get (WYSIWYG) editor, a commercial mouse for input, a graphical user interface (GUI), and bit-mapped display, and offered menus and icons, linked to a local area networks (first Ethernet device), implemented electronic mail, and stored files simultaneously. The webpage goes into great details of how they are restoring the hardware along with a lot of pictures. http://www.ainotl.com/alto.html All this Alto fascination has got me wondering if anyone is working on Alto emulation.If not I'd be interesting in starting this dauting task, but don't think I know where to start. Do binaries of the ROM/OS/Applications exist? I'm sure Al Kossow must have Alto hardware docs. Are there any roadblocks in trying to build an Alto Emulator (I've always wondered why an Alto Emulator doesn't exists yet.but I ask the same of my 2nd favorite machine - the Apple Lisa). Anyone else interested in undertaking this task? -Chandra

21 years, 8 months

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Pro350 VAX console?

by waltje＠pdp11.nl

Hi all. Last week I grabbed a what seems to be "pristine" DEC Pro350 which was in use as a VAX console.. the VAX interconnect cable is still attached to it. Now, before I strip it to become a regular Pro.. would it be useful to save the disk's current content? I seem to remember a discussion on that stuff being hard to find... Thanks, Fred

21 years, 8 months

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Electronics Barn closing

by evan947＠yahoo.com

John, Here in Jersey there's a place called Green Brook Electronics, on Rt. 22 in Green Brook -- (732) 968-3500.

21 years, 8 months

1
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Mistake in AP story about Steve Jobs...

by news＠computercollector.com

Hi all... I just read this AP story about Jobs having surgery for a non-fatal form of cancer. The story is here: http://story.news.yahoo.com/news?tmpl=story&u=/ap/20040802/ap_on_bi_ge/stev… I called the AP's office to report the mistake that you'll all notice: in the story's next-to-last paragraph, it says "In 1984, the company released the Macintosh, which was the first computer to have a graphical user interface that mimicked a physical desktop." I ** cringed ** when I read that. As most of you know by now, I'm a tech reporter for a living, and a collector, and thus HATE when the mainstream media doesn't even make an attempt to get this shit right. So I explained to an AP editor what the mistake is. I explained to him that the distinction is NOT a tiny technical loophole, but rather a glaring error that anyone who knows anything about computer history will laugh at (after they finish crying). I could understand a weekend reporter making this mistake, but in the story's byline it says the writer is a technology reporter. You'd think he would know the difference... - Evan

21 years, 8 months

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8" floppy project

by doc＠mdrconsult.com

I'm working on a PC-based external 8" floppy drive, mostly to be able to format the 30-40 pounds of perforated placemats (aka bulk-erased RX02 disks) in my garage, and to be able to archive the few PDP-8 and Xerox systems disks, games disks, diags and source disks I have, but don't have the equipment to run. I've discussed this in pieces here, but I'm ready to try to actually put it all together. The first order of business is an interface cable for a standard ISA floppy/IDE controller. I've found this pinout: http://tinyurl.com/5c5fb but no confirmation that it actually worked with a YD-180 drive, which is what I have available. Second issue is powering the drive. YE Data's schematics say +24VDC, max 1.0A, typical 0.4A, and 5VDC, max 1.0A and typical 0.4A. However, I've also found Usenet posts claiming a peak draw of 24VDC(a)2.2A and 5VDC(a)1.7A, so I'm inclined to be generous. I'm also not at all versed in electronics, so I'm not sure what to look for past those specs. Jameco has these units: http://tinyurl.com/3lpjc PWR SPLY,SWITCH(D-60B)58W, 5V@3A,24V@1.8A,UL/TUV/CE Jameco #123465 http://tinyurl.com/4whtu PWR SPLY,SWITCH,45W,5VDC@5A, 24VDC(a)1.8A,PFC,UL/CSA/CE/TUV Jameco #194870 http://tinyurl.com/6fpp9 PWR SPLY,SWITCH,65W,5VDC@6A 24VDC(a)2.6A,PFC,UL/CSA/CE/TUV Jameco #194896 http://tinyurl.com/64rml PWR SUPPLY,SW,65W,5V/7A, 12V/3.2A,2.4V/1.5A,MIN,LOADREQ Jameco #215706 Which is most suitable for an external floppy enclosure? If "none of the above", what am I missing? At the risk of heresy, right now I don't have time to be educated in the issues; just point me in the right direction and shove, please. :) BTW, I'll be more than glad to list and share the software I have. After it's archived, I'll be looking to give away the disks I can't use, or trade them for blanks. Thanks, Doc

21 years, 8 months

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OT: IBM Electric typewriter servicing info needed.

by sastevens＠earthlink.net

This is offtopic for a Classic Computer list, but it's at least classic office equipment from IBM: I recently acquired and am trying to restore an IBM Electric Typewriter. This is a pre-Selectric machine, and even pre-Executive machine. My mother used an IBM Executive electric typewriter years ago to type church bulletins and misc. The machine I have is an IBM Type 11C according to the model plate on the bottom. The few references and pictures I have been able to find online make it appear this machine was new in the early to mid 1950's. I can't find any information about this type of machine anywhere. There are a few Classic Typewriter sites, but what I am looking for is servicing information, how and where to lubricate, etc. The typewriter works mostly fine, but a few keys hit much lighter than others and the carriage shift mechanism is sticky. I've already solved the issue of not being able to find ribbons by rewinding a new generic fabric ribbon onto the IBM spools. I want to restore this machine and use it for writing. There's an appeal to writing direct to paper that is missing in computer-based composition of text. I'd also love to find more resources for older pre-computer IBM equipment, and possibly a few more pieces of such equipment for my collection. IBM was once about Time Clocks and such, long before it was a computer company.

21 years, 8 months

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Fw: Insect Conductivity - language?

by geoffreythomas＠onetel.com

----- Original Message ----- From: "Geoffrey Thomas" <geoffreythomas(a)onetel.com> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org> Sent: Tuesday, July 27, 2004 8:36 PM Subject: Re: Insect Conductivity - language? > Me , I want to know what the ants said in reply. Translation anyone - > looking for a babel fish......... > I was up on the scaffolding outside my house today (we're having some > cladding fitted ) fitting up my uhf aerial in a higher position when a > squadron of flying ants descended on everything - from the park at the back > of the house. I'm afraid I outdid Sellam , and ,statistically speaking , you > wouldn't expect that many ants to be illegitimate. They wouldn't go away so > I had to come inside , it's a bit dangerous when you're up high and ants are > exploring every part of your anatomy ; I've just had a shower and two came > out of my hair- silly little buggers. > What's this got to do with fucking computers anyway ? ................... > Geoff. > Having decided to enter the debate I thought I might try out a bit of allusion alongside an expletive - as above . I must say that I find it distinctly uncomfortable to see the last line in print. I think I belong to the school that believes that swearing is an art form ( not ark B ) and if it is used indiscriminately it loses it's impact. I think this is true of most things in life . I find that the allusion is a lot funnier as , obviously, it leaves the reader to visualise the word and the "scene" for him/her/self. (P.C.)This is a bit like radio as opposed to tv , I suppose. Swearing , in a conversational context, is probably easier to get away with as you have inflexion, intonation etc. to convey meaning and any humour. This is why it looks so bad in print , I think. I thought the beginning of " Four weddings and a funeral " was poor in this respect -poor acting?- but perhaps it's a generation gap effect. I certainly have no objections to anyone writing such in an email , I merely express my own mild discomfort at seeing my own word in print. I don't believe in any form of organised religion with a deity , in case anyone is wondering. The only person I know who has a magic wand is Sooty ! Izzy Wizzy ..................... Geoff.

21 years, 8 months

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Scooter Computer and Mr. Chips

by vcf＠siconic.com

I was walking out of the supermarket the other day with my corn and sour cream and noticed that they were selling a DVD compilation of all the School House Rock videos ever made, including unreleased and never before seen episodes. The DVD was $19.99, and they also had a VHS tape at $12.99. Amazon listing it for a couple bucks more: http://www.amazon.com/exec/obidos/tg/detail/-/B00005JKTY/qid=1091393049/sr=… For the uninitiated, School House Rock was a series of interludes shown during Saturday morning cartoons[1] which put learning concepts (science, history, mathematics, language, etc.) to rock music. It started in the mid-1970s and they were shown through to at least the mid-1980s before they apparently got too outdated to show any more. "Scooter Computer and Mr. Chips" was a three part series that introduced computer concepts. Apparently there's a newly(?) produced 4th episode on the DVD. [1] An institution amongst American children during the 1980s, now defunct due to the supplanting over time of all the good cartoons with absolute crap starting with cocaine-induced dreck like The Smurfs and My Little Pony. -- 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 ]

21 years, 8 months

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VCF East Pictures

by wayne.smith＠charter.net

I have posted a smattering of pictures from the first day of VCF East here - http://home.comcast.net/~msmith6020/VCF.html. I had to leave mid-afternoon on Friday and wasn't able to get a clear shot of every exhibit due to the crowd. -W

21 years, 8 months

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CCTALK/CCTECH archives

by vcf＠siconic.com

I found a great place that has archives of many various mailing lists, including CCTALK and CCTECH: http://archive.netbsd.se/ Seems to be duplicates of what's on ClassicCmp.org, but the interface seems nicer. Doesn't ANYONE have archives going back to the beginning? Whatever happened to the old archives? They were so nice... -- 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 ]

21 years, 8 months

3
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a classiccmp electronics project?

by dwight.elvey＠amd.com

>From: vrs <vrs(a)msn.com> > >> OK. I was thinking about the microcode ROMs in an HP9810 (somethign that >> _I_ am working on, and those are most certainly 'hit' as soon as INIT is >> deaseserted and the microocde program counter starts to change. I prefer >> to think of general-purpose solutions (i.e. somethign that will replace >> every 256*4 ROM), rather than soemthing that works only in specific >> machines under specific circumstances. > >I must not be getting it, somehow. > >Why can't you just use a 45ns or 55ns 27c256 or 27c512 and swizzle the >pinout? These are around $3 per chip, and seem to meet the requirements. > > Vince > > Hi I did some searching on the web but never found any 27c256's faster than 70ns. I did find 27c512's and 27c010's at 45ns a couple of places. Dwight

21 years, 8 months

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More HP microcode & loader rom detective work

by dwight.elvey＠amd.com

>From: "Jay West" <jwest(a)classiccmp.org> > ---snip--- > >And lastly, I'm confused about FFP. I am guessing that FFP required FP, >which is supposed to be standard on E series. But a few lines in various >docs make me think that perhaps older rev E series didn't have FP built in. >Some docs mention that when ordering FFP, you can specify option -100 to get >some additional roms, necessary for E series machines with a serial number >less than 21XX (co-incidence on the rev number). I'm guessing that the >additional roms are FP? The roms in question are: Hi again My understanding is that for the E series, the only difference between the E and the F is the additional firmware ROMs. My understanding is that you'd need the ROM expansion board. I hope you are going to make some binary files of all these ROMs. Maybe Al can make a directory to hold ROM images. Dwight

21 years, 8 months

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More HP microcode & loader rom detective work

by dwight.elvey＠amd.com

>From: "Bob Shannon" <bshannon(a)tiac.net> > > > >Jay West wrote: > >><snip> >> >>1816-0420 No clue >> > >Paper tape. This is the 'fastest' easy way to bootstrap an HP 1000. > >Use this with a 12566 microcircuit I/O board, and you can load a 31K word >boot image in less than 2 seconds, faster than many stock HP disk drives. What data source are you using? I was thinking of connecting this board to the parallel port of my PC to make the PC look like an external drive. Dwight > >Use this boot rom with the emulator I'm building for you. I'll supply a >cable and jumper settings for the I/O card (gnd true). > >

21 years, 8 months

2
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Jupiter Ace FORTH Programming

by cb＠farley-hill.freeserve.co.uk

Hi, I understand you have the above book - would you consider sending/selling me a photostat of it? Regards Chris

21 years, 8 months

1
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a classiccmp electronics project?

by jwest＠classiccmp.org

Ok, I don't know if this is possible, but it would be handy so I'll throw the idea out and see if the more electrically inclined have any ideas. My specific issue is the HP2100A, 2100S, and 21MX M/E/F systems. However, I suspect this problem is present in other machines... DEC, DG, etc. The loader roms and microcode roms (two different chips) for each system are pretty much impossible to find. I'd like to make copies of them both for myself to use in other systems I currently have, and also to have a set of spares around. In addition, I'd like to make copies for other classiccmp'ers who may have systems that want/need a particular firmware or loader rom option. Finally, there are some roms that people have posted images for online that I'd like to burn myself because I don't have those particular roms. Since the blank chips are nigh impossible to find anymore... is it possible to use something like a PIC chip on a small DIP carrier card, that could be plugged into an existing loader rom or microcode rom socket and function just like the "real thing" to the system? Would this be something terribly difficult to build? A cute twist on this.... extending the idea further.... Put a bunch of NVram or an EEprom on the little carrier card. In the NVram could be stored multiple ROM images. Then via a switch on the card (when the system is powered off of course), you could select if the chip was a mag tape loader rom, or a paper tape loader rom, etc. For the microcode roms you could switch between FFP and IOP for example. When you wanted to change the set of rom images in the DIP package, you just hook it up to a serial port and download to change the available sets on it. The WCS card for HP boxes comes close to this, but there's no battery backup, and you can't program it easily with a PC. WCS cards probably aren't terribly easy to find anyways. Is this a pipedream? It would allow DEC'ies to have more loader roms they dont currently have by exchanging images via the net, etc. Not just an HP thing - but I realize it would have to be a different design electrically to work on the other machines. I'm thinking of a universal rom with different electrical interfaces on the carriers perhaps? Everyone talks about preserving ROM/PROM contents. But if the blank roms are unobtainium, we need to take the next step. Any thoughts? Jay West --- [This E-mail scanned for viruses by Declude Virus]

21 years, 8 months

8
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PDP 11/23 Plus

by bmachacek＠pcisys.net

I just located a PDP 11/23 Plus that is going to be scrapped soon if no one is interested in it. I told the owners that I would check to see if there was any interest in the unit from a chat site I am part of. This is a rack mounted unit with 2 RL02 drives and several disks for the RL02 units also in the rack. It also has the air conditioning attached to the back of the rack. It is sitting outside (come rain or shine) so it may be vandalized at some point in time or the weather may get to it. The owners are interested in getting rid of it, but of course want a payment of some amount. They did not give me a number of what they wanted for it. Is there any interest here on the board? I can go back and get more information on the item if needed. Just let me know what you'd like to know about it. I was going to get the SN, but couldn't find it. I'm willing to work with anyone who is interested..... Bill Machacek Colo. Springs, CO

21 years, 8 months

3
2
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Heathkit/Zenith tubes

by JMeyer101＠aol.com

Heathkit/Zenith TubesI have 4, new in the box, CRT Tubes that may work with a Heathkit/Zenith H-19 or H-89 computer (I'm not sure how big the display on these models are. The tubes are 8 1/4 " x 6 1/4"). If they are for something else, and you know what that is, please let me know. I have been trying to find out exactly what these tubes are. I have pictures for additional identification. I would hate to get rid of them only to find out they are still useful for a repair or collector. Here are the part numbers and information: These numbers are on the tube: MN1012Pe1Av 254 and CPJ240A1V and 100-730-03E and HG-319 and C1406 380-2655 is written on the bottom of the boxes. The boxes are labeled Heathkit, but the tube inside is labeled Zenith. Thank you, Jeff Meyer

21 years, 8 months

1
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Wang 2200 LVPC-E available

by frustum＠pacbell.net

A gentleman in Baltimore sent me this email: <start of email> I happen to have a Wang 2200 and have been wondering about it. I used to have a one man computer hardware design consulting company with an office in a medical/professional office building. One day a doctor in a nearby office had the maintenance man wheel in this Wang 2200 into my office. No manuals, no floppies, no terminals. As far as I know it was in working condition when it was retired circa 1996. It in a storage area since then and I have decided it needs a good home. <end of email> A subsequent email showed it to be a Wang 2200 LVPC-E, made in 1983. The machine has a single 8" floppy, but the internal hard disk has been removed. The VP series machines had a writable microcode store, so to execute BASIC, it had to come off of a disk. So as it stands, it will not boot. I asked him about his asking price and he said: <start of email> This unit is very heavy, so I worry about delivery. My ideal scenario is someone would drive up and grab it from me. From what you said it would cost more to ship (have to be by truck) than its worth. <end of email> If you are interested in the machine and can pick it up, please send me an email at frustum(a)pacbell.net and I'll send you pictures and I'll give you his email address. I'm not posting his email directly so his address doesn't get spam harvested.

21 years, 8 months

1
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IBM 1092

by mross666＠hotmail.com

I've recently heard of an archaic IBM device, the 1092 Densely Coded Matrix - a 10 x 15 array of switches, essentially a Big Keyboard, with customisable plastic overlay 'keycaps'. Could be used for input on 60's systems - 1410, my 1800, probably S/360 too. Originally developed at the University of Missouri, for control of CNC-type cloth cutting machines in garment trade. Anyone got one? Seen one? Anecdotes of them? BTW, I'm *still* engaged in a probably-hopeless search for a 1052 or 1816 (heavy-duty 1052) console to use with my 1800, in the increasingly-unlikely event that anyone here can point me towards one... Mike http://www.corestore.org

21 years, 8 months

5
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Looking for old data information

by dwight.elvey＠amd.com

Hi Does anyone have any data books with the specs and signals for Rockwell's 4 bit processors that they made during the late 70's? These were in a funny flat pack called spider chips. Dwight

21 years, 8 months

5
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Looking for old data information

by dwight.elvey＠amd.com

>From: "John Honniball" <coredump(a)gifford.co.uk> > >Dwight K. Elvey wrote: >> Does anyone have any data books with the specs >> and signals for Rockwell's 4 bit processors that >> they made during the late 70's? These were in a >> funny flat pack called spider chips. > >I have a book by Steve Money called "Microprocessor Data Book", and >it lists three Rockwell 4-bit chips, the MM75, MM76 and MM78. They >make up the PPS4/1 Series. Are they the ones you are interested in? > >-- >John Honniball >coredump(a)gifford.co.uk > > Hi John Hard to say. The chips I have all have inhouse numbers on them. It sure does sound like the right stuff though. The chips are all 42 pin spider chips. Dwight

21 years, 8 months

2
1
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IBM 1092

by mross666＠hotmail.com

Date: Fri, 30 Jul 2004 21:01:44 -0400 From: "John Allain" <allain(a)panix.com> Subject: Re: IBM 1092 >I have a device like this, taken from IIRC an NCR device ca. 1960. >It is definitely a keyboard and it contains a matrix of something like >(3x8+AD0-)24 by 24 switches, and it is coded, perhaps BCD. Underneath it >is all hand strung wires. I can dust it off and send photographs if >you're interested. I'm primarily interested in DEC & IBM stuff, thanks... why don't you put the photos on a website where everyone can see them? >1401 I've heard of. What's an 1800? Same architecture as the 1130, but a much bigger box. Built like a System/360, from SLT logic. See: http://www.corestore.org/1800-2.htm Cheers Mike

21 years, 8 months

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Lucas Electrics: RE: Commodore Pet ROM trouble... EPROM Substitutes...

by dwight.elvey＠amd.com

>From: "Don Maslin" <donm(a)cts.com> > > > >On Fri, 30 Jul 2004, Joe R. wrote: > >> At 04:41 PM 7/29/04 -0700, you wrote: >> >>> That's called a 'Light Emitting EPROM' and it's an expensive and >> >>> short-lived alternative to an LED. >> > >> >>Is this related to things like the SER (Smoke Emiting Resistor -- one >> >>where the power rating is massivle exceeded), SEC (Sound Emitinf Capacitor >> >>-- an electrolytic wired backwards), the Friode (a diode that's >> >>open-circuit both ways), etc? >> > >> >Sounds like what Lucas Electric used to use. >> >http://pw1.netcom.com/~krk/lotus/humor/lucasjokes.html >> >> ROFL! Only someone who's had a vehicle with Lucas electronics could >> truely appreciate that! >> >> Joe (x-1952 MG TD) > >...or had experience with Magneti Morelli eqquipment! > xxxxxxx > Marelli > > - don > Hi The only problems I've ever had with Lucas was there fuel pumps, ignition coils, distributors, alternators and fuse holders. The Magneti Marelli stuff was actually a little better. I never had issue with the alternators ( regulators were junk ) but then I never had an Italian car with an electric fuel pump. For switches, the worst I ever encountered were used in Audi's. Dwight

21 years, 8 months

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Old EPROM questions again, EPROM Programmer

by dave04a＠dunfield.com

>> >And thereing lies the problem. Presumably you need to program an EPROM >> >with the firmware for this 6809. Which is somewhat hard without a >> >programmer :-)... >> >> For some perhaps - at the time, myself, and almost everyone I knew worked >> for companies with programmers, so it was not a problem. You could also get > >You were lucky. I was a student at the time, and in fact I built the >program over an Easter vacation one year. I didn't have access to a >programmer -- that's why i needed to build one. Agreed with all your points that it may not have been possible - but I did learn many avenues to work around such problems - when I was a student, I "found" the only programmer in the place and got to know the guy who was in charge of it ... :-) My "not available" story: I was at my parents home over a long weekend when I finally got my wirewrapped 8080 system to the point where it could use a keyboard - as they lived in the country, there was no chance of scrounging one (I couldn't afford to BUY anything back then), so I decided to build one... Picture a flat piece of wood, at each key location is a metal thumbtack with a bit of fine wire (salvaged from a transformer) attached. Two spacers at each end allow another "board" to live about 1/4 inch above it. It had holes drilled over every key (thumbtack), and in each hole was a nail pointing up, going through a spring (springs came from an old contruction kit) into a hold drilled into a short piece of dowling which was the "keytop" - another bit of fine wire shoved into the hold beside the nail made the top contact. The contacts from the "keys" went to a rather large and unsightly mess of diodes (salvaged from an old Burroughs posting machine) and ultimately to a set of 8 transistors, which game 7-bit ASCII and a strobe. Took me most of the weekend to build the thing, and it actually worked! Although it was not the most pleasant thing to type on (rollover ... we don't need no steenking rollover :-) One of the few things from my very early digital experiences that I really wish I had saved... [It was replaced within a couple of months with a real keyboard (scrounged) and remapped to ASCII with a 1702] >Unless your programming skills are perfect (and mine are not), this gets >boring fast when you have to wait a few days for each update. In fact the >time taken to erase and reporgram an EPROM yourself soon becomes painful, >that's why I included an emulator in my programmer. >... >> I didn't program the actual firmware right away - I made a EPROM (at work) >> with my 6809 monitor program in it, which allowed me to download code into > >Right... Again this assumes your monitor is debugged. In this case, it was - I did a *LOT* of 6809 code in those days, both privately and commercialy - I had my own debugger (still around essentually unchanged as the MON09 debugger I list on my site), and I designed my EPROM programmer to have the same serial port devices (6551), and RAM in the right place for the monitor to run (ROM was at E000 of course - 8k at top in 6809 map). Had I not had a debugged monitor, I would have written a very simple loader. Just enough to get a "real" loader into the machine - unless I really cocked it up, that would be all I needed, and I doubt I would have had to have the ROM made more than once (did similar things on many other projects). I selected the 6809 in the first place because I had recent experience with it and suitable tools available... >Incidentally, I've built a couple of instruments with microprocessors (as >opossed to microcontrollers) controlling them (actually I normally used >the 6809 -- nice chip), and I included commands to read/write/execute >from any location in mmeory. Sure helped debugging !. Yup - 6809 was an incredible chip - easy to multitask (and most people don't know what DP is for!) - I always include low level debugging features/commands, can be absolutely essential at times. >> If I were doing the same project today, and had absolutely no access to any >> means of programming the initial EPROM, I would first post in the local groups > >These days I'd either use a PIC as the controller processor (trivial to >make a programmer for, and the programming algorithms are documented), or >if I was using some deviec with external program memory, I'd start off >using E2PROM or something, again easy to make a programmer for. I now >have access to rather more computers, with rather more user I/O lines... Yeah, OK - I would use some little flash device too - I was speaking in terms of if I were faced with the same problem to build exactly the same type of device with similar parts ... >This was long before the days of the Internet in the UK. It wasn't easy to >find places to ask about borrowing a programmer. Not familier with UK companies etc. - this would have been somewhere in the mid 80's, and I was reasonably well past being a student ... but these are the kinds of things I would have tried had I still been in school: - Local companies that were "friendly" ... might involve having a friend who's dad worked there. - Local shops, schools etc. - BBS systems - lots of other "geeks" hung out there, many with good connections... fidonet was king before the internet. >> I guess what I am saying, is that if you are not prepared to be a little >> creative, you are probably not well suited to designing/building your own >> test equipment. > >Are you saying I'm not creative? NO! that was a general comment, and NOT directed to you specifically. - I know you are creative (from your postings), and you did solve the problem - no need to defend your honor any further. but.. especially in todays world (as you point out), having to get the "first" ROM programmed should not be a show stopper. Even that is only an issue if the OP decided to build my design "as is" - as discussed earlier in this message, a little flash device could be used and then all you need is a serial or parallel port to program it (depending on the requirements of the device). To me (primarily a software guy), using a little controller with lots of I/O and ability to time pulses far more accurately than winblows, it still makes sense to design a micro based device. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

21 years, 8 months

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OT-ish - converting hex output to binary on a Unix platform

by dwight.elvey＠amd.com

>From: "Stephane Tsacas" <stephane.tsacas(a)gmail.com> > >ahhhhh okay :) >You mean if you have 23 as input (2 digits/ascii code of 2 and 3) the >output should be the binary value 0x23 in one byte. Correct ? >So input is ascii and output is a binary file, not ascii. Hi Stephane Now you got it. Dwight > >awk --non-decimal-data 'BEGIN {RS=" "} {x="0x"$0; printf("%c", 0+x);}' | >od -t x1 >0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 1F 20 FA FB FC FD FE FF >0000000 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f >0000020 10 11 1f 20 fa fb fc fd fe ff >0000032 > >I use 'od' to do the binary to ascii conversion so I can print the >result. But you can also redirect the output in a file and load it in >emacs (in hexl-mode) to double check. >Massaging of the value can be done before the printf as in : >awk --non-decimal-data 'BEGIN {RS=" "} {x=$0; x++; x="0x"x; >printf("%c", 0+x);}'|od -t x1 >1 2 3 >0000000 02 03 04 > >/s >On Fri, 30 Jul 2004 19:40:51 -0700 (PDT), Dwight K. Elvey ><dwight.elvey(a)amd.com> wrote: >> >> >Date: Sat, 31 Jul 2004 04:16:09 +0200 >> >From: "Stephane Tsacas" <stephane.tsacas(a)gmail.com> >> >To: "Dwight K. Elvey" <dwight.elvey(a)amd.com>, "General Discussion: On-Topic and >> Off-Topic Posts" <cctalk(a)classiccmp.org> >> >Subject: Re: OT-ish - converting hex output to binary on a Unix platform >> > >> >awk --non-decimal-data 'BEGIN {RS=" "} {x="0x"$0; printf("%d ", x)}' >> >0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 1F 20 FC FD FE FF >> >0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 31 32 252 253 254 255 >> > >> >better ? >> >> Hi >> I think your still missing the point. Your printout is >> all in ascii. If things were working as expected the >> number '31' hex would display as '1' when printed. Many hex >> numbers would not even display. It looks like the variable >> is now correct but you need to write it as the byte value >> to a file not convert it to the decimal printed >> as ascii digits. 255 is the binary values that are 00110010 >> 00110101 00110101. This is 3 values not the one value 11111111. >> I think you are still confusing the byte with the displayed >> value. >> Am I making sense? >> Dwight >> >> >> >> > >> >On Fri, 30 Jul 2004 18:26:12 -0700 (PDT), Dwight K. Elvey >> ><dwight.elvey(a)amd.com> >> >wrote: >> >... >> >> I'm not sure this is what he is looking for. I think >> >> he wants the hex number converted to a byte value >> >> not just printed in ascii as a binary value. >> >> Dwight >> >> >> >> >> > >> >> >

21 years, 8 months

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Intellec 4

by dwight.elvey＠amd.com

>From: JMeyer101(a)aol.com > >I recently acquired a few older computers. One of the units is a working MCS Intellec 4. Unfortunately, I have no knowledge of how to program this computer or what accessories can be used with it. Can anyone help me out? > >Thanks, > >Jeff > Hi Jeff As I recall, there wasn't any OS or anything for these. They were primarily used to run experimental code on or blow EPROMs for some other machine. They usually had enough ROM in them to do things like take data from a paper tape reader and program proms. They may have had some form of monitor code as well. They usually had cards with hardware to emulate the 4001 I/O functions so that one could debug their code befor commiting to the mask ROM in the 4001's. Joe R. might have more info on this machine. It is a collectors item for sure. I do have some manuals for the MCS-4 series parts that can help and if you can dump the EPROMs in the machine, I can disassemble them for you. The EPROMs are most likely 1702A's. These do require some non-standard voltages. One can often make up an adapter with an external supply to read these as though they were 2716 or something on a standard EPROM programmer. I am setup to read and write 1702A's on my 4004 machine. ( not an Intellec-4 ). Although, it doesn't talk about the Intellec-4, the manual I have does sedcribe the 4004. I also have a newer manual that describe the 4040 as well. I just sent a copy of the older manual off to one of the other follows and it cost about $13 to mack copies and send it to him( as I recall ). Dwight

21 years, 8 months

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Article on data rot on CD's

by msokolov＠ivan.Harhan.ORG

Paul Koning <pkoning(a)equallogic.com> wrote: > Teo> .... I would also like to know what > Teo> affect printable adhesive labels have on media... > > I have a simpler rule for those: "just say NO". So how is one supposed to label recorded CDs then? There needs to be some way to identify which CD-R contains what... MS

21 years, 8 months

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HP 1000 ROM part number history PDF

by jdbryan＠acm.org

For those interested, the HP M/E/F-Series ROM Part Number History that I mentioned in an earlier post is available as part of the "Communicator/1000 for Software Update 6.2" PDF available at: http://www.hp.com/products1/rte/tech_support/5963-4402.pdf See pages 3-120 through 3-124. -- Dave

21 years, 8 months

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OT-ish - converting hex output to binary on a Unix platform

by julesrichardsonuk＠yahoo.co.uk

Silly question, but maybe someone here's found a nice way of doing this using standard Unix tools... I have a few files in hex format (actually ROM dumps) and want to convert them to binary. Sort of the reverse of the hexdump utility. I'm not aware of a standard (and probably on-topic!) Unix util to do this, but maybe someone knows if there is one, or a handy way of doing this using some of the standard text-processing utils that Unix has... (files are in the format of 16 pairs of uppercase hex digits per line, with a trailing space after every pair - even the last one on a line) I'm rapidly coming to the conclusion that I need to remember some C again - and I've only just finished emptying my brain of it after the last time I needed to code in it a couple of months ago :-) cheers Jules

21 years, 8 months

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Whirlwind: Re: First computer with real-time clock?

by aek＠spies.com

Kent C. Redmond and Thomas M. Smith, Project Whirlwind: The History of a Pioneer Computer, Bedford, MA: Digital Press, 1980. ISBN: 0932376096 The book is pretty light on techical information on the computer, however. I'm hoping there is some meater info on Whirlwind buried in the CHM stacks.

21 years, 8 months

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Cirris 1000

by Lee.Davison＠merlincommunications.com

> Holy moley! Speaking of word usage, I sure hope there's nobody from > Wales on this list. Why should we be offended? Just 'cos Joe can't spell? 8^)= Lee. >> Jim, >> >> Yes I still have it. The winnng bidder welshed out and >> never paid for it. BTW note my address above. The address >> that you sent the message to is for a mailing list. >> >> Joe ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

21 years, 8 months

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OT-ish - converting hex output to binary on a Unix platform

by stephane.tsacas＠gmail.com

ahhhhh okay :) You mean if you have 23 as input (2 digits/ascii code of 2 and 3) the output should be the binary value 0x23 in one byte. Correct ? So input is ascii and output is a binary file, not ascii. awk --non-decimal-data 'BEGIN {RS=" "} {x="0x"$0; printf("%c", 0+x);}' | od -t x1 0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 1F 20 FA FB FC FD FE FF 0000000 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 0000020 10 11 1f 20 fa fb fc fd fe ff 0000032 I use 'od' to do the binary to ascii conversion so I can print the result. But you can also redirect the output in a file and load it in emacs (in hexl-mode) to double check. Massaging of the value can be done before the printf as in : awk --non-decimal-data 'BEGIN {RS=" "} {x=$0; x++; x="0x"x; printf("%c", 0+x);}'|od -t x1 1 2 3 0000000 02 03 04 /s On Fri, 30 Jul 2004 19:40:51 -0700 (PDT), Dwight K. Elvey <dwight.elvey(a)amd.com> wrote: > > >Date: Sat, 31 Jul 2004 04:16:09 +0200 > >From: "Stephane Tsacas" <stephane.tsacas(a)gmail.com> > >To: "Dwight K. Elvey" <dwight.elvey(a)amd.com>, "General Discussion: On-Topic and > Off-Topic Posts" <cctalk(a)classiccmp.org> > >Subject: Re: OT-ish - converting hex output to binary on a Unix platform > > > >awk --non-decimal-data 'BEGIN {RS=" "} {x="0x"$0; printf("%d ", x)}' > >0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 1F 20 FC FD FE FF > >0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 31 32 252 253 254 255 > > > >better ? > > Hi > I think your still missing the point. Your printout is > all in ascii. If things were working as expected the > number '31' hex would display as '1' when printed. Many hex > numbers would not even display. It looks like the variable > is now correct but you need to write it as the byte value > to a file not convert it to the decimal printed > as ascii digits. 255 is the binary values that are 00110010 > 00110101 00110101. This is 3 values not the one value 11111111. > I think you are still confusing the byte with the displayed > value. > Am I making sense? > Dwight > > > > > > >On Fri, 30 Jul 2004 18:26:12 -0700 (PDT), Dwight K. Elvey > ><dwight.elvey(a)amd.com> > >wrote: > >... > >> I'm not sure this is what he is looking for. I think > >> he wants the hex number converted to a byte value > >> not just printed in ascii as a binary value. > >> Dwight > >> > >> > > > >

21 years, 8 months

1
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PDP-11/04 issues

by doc＠mdrconsult.com

I have a new-to-me 11/04 in the kitchen, and I'm having some very odd problems with it. Slot 1 - M7263 11/04 CPU Slot 2 - empty Slot 3, AB - M9301-YA Slot 3, c-F M7859 KY11-LB Console interface Slot 4, C-F M7856 SLU, switched for 9600bps, 8N1, 20mA C.L. console Slot 5-6 - G657/H228-B 64KW core assy. Slot 7-9, D - G727 grant continuity modules Slot 9, AB - M9302 Terminator In the "book" configuration, as above, it boots to zeroes on the console LEDs with the RUN light and SR DISP lit. I can CLR the SR DISP, but the only other response I get with the panel is by halting it (CNTRL-HALT), which lights the BUS ERR light. On the other hand, if I remove the M9302, the system powers up to 000002. I can load and examine addresses from the console, deposit code, etc. CNTRL-HALT increments the counter, and CTRL-BOOT brings up the console emulator on the VT220. I can run L, E, D, and presumably S commands from the console emulator. Since I don't have any mass storage on it yet, that's as far as I've gone. Last, if I replace the M7263 with an M7266 and M7265 in slots 1 and 2 respectively, All the above applies excpt there's no terminal output. There's something decidedly un-kosher there, and I'm not catching on. It doesn't help that the processor handbook I have assumes MOS memory and contradicts everything I can find on Teh Inturnet about board placement. (It says something about CC that I'll try configurations I've seen twice in the archives over DEC's own literature.) So, the questions: Is there a simple program (or set of) I can key in to test operation? I'm no programmer, so you'd need to tell me the expected result, too. Is this correct behavior? Running without a terminator seems very wrong. (I've tried replacing the G727 cards with G7273 NPG cards, BTW) I keep seeing references to the DIP switch settings on the M9301 board, but I can't find a reference to tell me how they should be set. Are we having fun yet? ;-) Yes, this is my two weeks at home between travels, my wife is visiting her mom in New England, and I'm catching up on Geek Time. There are 3 PDP-11s, a new-to-me IBM 9348-012 9-track tabletop, several terminals, laptops, and monitors, and an Amiga A3000 in the dining room right now. *I'm* having fun. Doc

21 years, 8 months

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OT-ish - converting hex output to binary on a Unix platform

by dwight.elvey＠amd.com

>From: "Stephane Tsacas" <stephane.tsacas(a)gmail.com> > >I guess you have hex digit as input, not prefixed by 0x (if they are, >remove the string "0x" from the x= statement. Maybe that code might >help : > >awk --non-decimal-data 'BEGIN {RS=" ";} {x="0x"$0; s=""; while (x > 0) > { s=and(x,1)""s; x=rshift(x,1); } print s}' > >0 1 2 3 4 5 6 7 8 9 a b c d e f as input will print : >0 >1 >10 >11 >100 >101 >110 >111 >1000 >1001 >1010 >1011 >1100 >1101 >1110 >1111 > >you can put your own code after the x= statement I guess. >Stephane > ---snip--- Hi I'm not sure this is what he is looking for. I think he wants the hex number converted to a byte value not just printed in ascii as a binary value. Dwight

21 years, 8 months

2
1
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Help with SMS Unibus controller

by doc＠mdrconsult.com

The model number is FD1100i, with a 50-pin Berg header and 3 34-pin headers. Found it in a full-height PDP-11/04. Pics of the SMS board and the 11/04 at http://www.docsbox.net/11-03/ Extreme hi-res scan (1.3MB jpeg) of the SMS board at: http://www.docsbox.net/11-03/FD1100i.jpg Out of consideration for low-bandwidth viewers, the hi-res scan is *not* included in the album. You'll need to go there explicitly. Docs would be nice. Doc

21 years, 8 months

2
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Lucas Electrics: RE: Commodore Pet ROM trouble... EPROM Substitutes...

by donm＠cts.com

On Fri, 30 Jul 2004, Joe R. wrote: > At 04:41 PM 7/29/04 -0700, you wrote: > >>> That's called a 'Light Emitting EPROM' and it's an expensive and > >>> short-lived alternative to an LED. > > > >>Is this related to things like the SER (Smoke Emiting Resistor -- one > >>where the power rating is massivle exceeded), SEC (Sound Emitinf Capacitor > >>-- an electrolytic wired backwards), the Friode (a diode that's > >>open-circuit both ways), etc? > > > >Sounds like what Lucas Electric used to use. > >http://pw1.netcom.com/~krk/lotus/humor/lucasjokes.html > > ROFL! Only someone who's had a vehicle with Lucas electronics could > truely appreciate that! > > Joe (x-1952 MG TD) ...or had experience with Magneti Morelli eqquipment! xxxxxxx Marelli - don

21 years, 8 months

1
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a classiccmp electronics project?

by dwight.elvey＠amd.com

>From: ard(a)p850ug1.demon.co.uk > >> >> Tony wrote... >> > Yes, modern SRAM is fast enough. But that's 'easy' in theory. Firstly you >> > have to have some way of switching the SRAM between the device and the >> > loader >> Dual port SRAM is one answer. Or, I'm not sure what the power on test in > >Sure, but have you looked at the price :-) Hi You use single port RAM with an output buffer ( could even be a 7404 but it would most likely need a 3state control, '240 or '244 ). You hold the machine in reset while you transfer data to the RAM ( It doen't make much sense to do it on the fly with the machine actually running ). This isn't much more complicated than a memory board. Dwight > >> microcode does on the MX's, but my guess is it doesn't touch the add-on >> microcode. The loader roms probably aren't touched either until called from >> the front panel. If the RPL stuff is turned on, it may though. I think the > >OK. I was thinking about the microcode ROMs in an HP9810 (somethign that >_I_ am working on, and those are most certainly 'hit' as soon as INIT is >deaseserted and the microocde program counter starts to change. I prefer >to think of general-purpose solutions (i.e. somethign that will replace >every 256*4 ROM), rather than soemthing that works only in specific >machines under specific circumstances. > >-tony > > >

21 years, 8 months

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Commodore Pet ROM trouble... EPROM Substitutes...

by RMaxwell＠atlantissi.com

On 2004-Jul-22 13:09:46 Wolfgang wrote: > > Mentioned TMS2532 Eproms are one of these Unobtainiums here. I've had better luck finding Hitachi's HN462532G version here... in Canada. That may be worth checking for. > Looking at the Pinouts I have in my databooks there are > little (minor?) Differences to the standard 2732's (besides > the different Program Supply Voltage). I couldn't find much 2732 and 2532 program at +25V, 2732A programs at +21V. +25V is fatal to 2732A. Don't ask me how I know that. > ressources online, but would it work if I made a small > adapter like "illustrated" below... > > 2732 2532 > EPROM -> SOCKET > Pin(s) Pin(s) > 1-17 -> 1-17 > 18 (E) -> 20 (PD/PGM) > 19(A10)-> 19 (A10) > 20(GVpp)> 21 (Vpp) No. The 2532 Vpp is always +5V when reading, and would keep 2732 outputs always OFF. The 2532 has just one enable pin, while the 2732 has two. Better to tie 2732-20 to 2532-18 (or to GND - outputs would be always enabled when the chip is selected). > 21(A11)-> 18 (A11) > 22-24 -> 22-24 > > Please correct me, if I'm completely wrong and trying to do > something impossible. Impossible? Nothing's impossible. Messy and difficult, maybe. > 2732's would be easy to obtain, and I have some > prommer-schematics and software handy. So it would be cool > if I could use them. > > Regards, > Wolfgang At VCF East 2.0 I brought along an EPROM programmer and some blank 2532s... not that you would have considered that to be East at all... ;o) Best of luck, Bob

21 years, 8 months

10
10
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Old EPROM questions again, EPROM Programmer

by rigdonj＠cfl.rr.com

At 07:20 PM 7/27/04 +0200, you wrote: >Hi all, <big snip> My (maybe dumb) >question: Does >anyone have some schematics and software (would be great) >for a little >homebrewed Eprom Programmer which works with a standard PC >parallel-port or >ISA slot? This would be a great project for rainy winter >days :) Why bother? You can buy them cheaply and easily, both new from the manufacturer's and used from E-bay. Yeah, Yeah I know someone will say it's an eductional thing but hanostly can't you find a better way to use your time than to reinvent the EPROM programmer for the 10,000th time? Joe > >Best Regards, > Wolfgang > > > > > >==================================================== >Ing. Wolfgang Eichberger cell.: +43-664-240-65-92 > http://www.eichberger.org > email: wolfgang(a)eichberger.org >---------------------------------------------------- >Gruentalerstr. 24 - 4020 Linz ? AUSTRIA >==================================================== >

21 years, 8 months

11
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Can anyone identify this portable?

by Innfogra＠aol.com

There was a clone case like this that you could put any XT board in. Check the BIOS. Very limited production. Paxton Astoria, OR

21 years, 8 months

1
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Old EPROM questions again, EPROM Programmer

by technobug＠comcast.net

On Jul 30, 2004, at 10:00 AM, cctalk-request(a)classiccmp.org wrote: At 08:59 PM 7/29/04 -0600, Ben wrote: > I would like to create several PCB's > rather than wire wrap but I have yet to find good information on PCB > layout guide lines > Check out <http://www.edwardrhamilton.com/titles/3/2/0/3202275.html> CRC

21 years, 8 months

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