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

by pete＠dunnington.u-net.com

On May 17, 22:11, Tony Duell wrote: > > Yes, a common pitfall. I got bitten by that :-) And the 74150 has the > > same number and arrangement of pins as the 74ALS150, but one is 0.6" wide > > and the other is 0.3" wide! > > Most of the 24 pin chips in the 'modern' familes (things like the 74F181 > and 74HC154) are 0.3" wide. The 'traditional' ones (74181, 74S181, > 74LS154, etc) are 0.6" wide. Don't ask how I found that out. > > Suffice it to say I have commerical instruments where the PCB was set out > for a 0.6" wide chip. In said space is a header plug, soldered to which > is the 0.3" 'modern' version with the pins bent out sideways. :-) A solution I've seen is more "three-dimensional". Take one 24-pin 0.3"-wide wirewrap socket. Bend the pins so they fit into a 0.6"-wide socket. Fit new IC to "upper" socket and fit this to the "lower" one. If liked, mould "power bulge" into the hood. Or cut ventilation hole. -- Pete Peter Turnbull Network Manager University of York

25 years, 1 month

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Slicing open the top of a 48T02 Sun Sparc chip to replace battery is that thing hollow or filled with epoxy?

by claudew＠videotron.ca

Hi I am considering slicing open the part epoxyed to the top of a 48T02 chip to replace or hook up a new 3VDC source. I dont wanna buy a new chip.... My plan is to use a Dremel type cutting wheel and do a "lobotomy" on the module fitted on top of the chip. Then, either connect a new 3VDC source to this (2 alkalines in a battery holder) or simply replace the cells inside. If the thing (the top module with the batt and osc) is not filled with epoxy I imagine this can be done...does anybody know if that module is "hollow" and removing the top will reveal the components inside...??? Or will I just be cutting through solid plastic/epoxy??? Other method would be to slowly grind top of module until components inside are revealed... Alternative method is revealing the wires coming from top part to chip by digging into epoxy on one side and hooking up there (from sun NVRAM faq)... Thanks Claude

25 years, 1 month

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Using audio cassette

by david_j_findlay＠yahoo.com.au

Hello I am a new member of the list in digest mode. I have read quite a bit about the early homebrew computer club days and processor techniques. I am currently designing my own computer and want to come up with a easy cheap method of mass storage. I have been thinking about hacking a tape recorder's read/write/erase heads and support equipment into my computer. I would just make a small modem thing to turn my data to sound and record it on the tape. Using a 90 minute tape, with a 10 second sector size, I would put a File allocation table at the start of the tape and that would tell the machine where to go to get a piece of data. Has anyone experimented with this sort of set up? I figured on audio tape because they are small, robust, and cheap. The computer will only be 16-bit so I don't think the speed of the storage would be a problem as my files won't be that big. It's got to be better than paper tape anyway. BTW, would anyone happen to know where I could find circuit diagrams/logic diagrams for either the PDP6 or PDP10? Thanks, David P.S. Could you please CC' your response to me? Otherwise I won't see your replies for a week... :-) -- David Findlay ---------- Email: david_j_findlay(a)yahoo.com.au Homepage: http://users.bigpond.com/nedz/ Segmentation Fault. (Core dumped)

25 years, 1 month

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destinking the computers.

by mmcfadden＠cmh.edu

Slightly OT. Yesterday I listened to a National Public Radio, NPR, segment on people who clean up crime/medical scenes. An example was a person who died in their bathroom and wasn't found for 1 month. They talked about odor removal, they use active enzymes to remove any organic remains. They wore tyvec suits, respirators, double gloves, boots and goggles. Basically they tore out the sheetrock, tile and carpet because the blood and body fluids seep everywhere. Lots of problems with maggots. Company's name was Bioclean. Two ladies with strong stomachs. I'd bet they could destink a computer. Morbid humor on, no offense intended, may not be humorous Probably could clean up after suicidal Microsoft windows programmer. Back to normal Mike mmcfadden(a)cmh.edu

25 years, 1 month

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Slicing open the top of a 48T02 Sun Sparc chip to replace battery is that thing hollow or filled with epoxy?

by pete＠dunnington.u-net.com

On May 17, 10:55, Claude.W wrote: > I am considering slicing open the part epoxyed to the top of a 48T02 chip to > replace or hook up a new 3VDC source. I dont wanna buy a new chip.... > > My plan is to use a Dremel type cutting wheel and do a "lobotomy" on the > module fitted on top of the chip. > > Then, either connect a new 3VDC source to this (2 alkalines in a battery > holder) or simply replace the cells inside. It's a single lithium cell inside > If the thing (the top module with the batt and osc) is not filled with epoxy > I imagine this can be done...does anybody know if that module is "hollow" > and removing the top will reveal the components inside...??? Or will I just > be cutting through solid plastic/epoxy??? It's solid. My colleague James Carter did this for one of his Suns, and he has a picture somewhere, showing a (replacable) battery fitted to the top. I can't find the picture on his web pages, but he mentioned it recently in response to a similar post on this list, so look through the archive... -- Pete Peter Turnbull Network Manager University of York

25 years, 1 month

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74xx orgin

by pete＠dunnington.u-net.com

On May 17, 16:43, John Honniball wrote: > I've checked my "System 74 Designer's Manual", and it's I no longer have my really old Texas TTL data books -- the oldest I have is 1982 -- but didn't one of th eold ones have a short chapter describing the evolution of TTL, S and H series, and LS? I thought it might have dates. > But an oddity did show up: the chip pinouts sometimes > differ between ordinary 74 TTL and the 74H version. A 7401 > has a completely different pinout from a 74H01, for > instance. And a 7454 has one less input than a 74H54 (it's > an AND-OR-INVERT chip). I hadn't spotted that before. Yes, a common pitfall. I got bitten by that :-) And the 74150 has the same number and arrangement of pins as the 74ALS150, but one is 0.6" wide and the other is 0.3" wide! -- Pete Peter Turnbull Network Manager University of York

25 years, 1 month

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74xx orgin

by pete＠dunnington.u-net.com

On May 15, 13:45, Hans Franke wrote: > When where the first 74xx ICs released / designed ? > Especialy when where complex chips like 744x, 748x or > 74181 first mentioned/available ? > > This may be a stuipd question, but I couldn't find any > information ... so all I have is my personal guess (~1970) > and the oldesd TTL book Philip Belben could find (1972). According to Webopaedia and at least one history website, Texas released the first SSI TTL chips in 1965 and LSTTL in 1970. It certainly must have been before 1970 becasue DEC were using 7440's, 7481's ($9 each according to the spares list), and 74Hxx in quantity for the PDP-11/20 by 1970. The PDP-8/I used TTL in 1968. And the Smithsonian site quotes "NMAH catalog number 1987.0487.128, 314, 315 1964 - TI-G00206,294, 343 documentation News release: TI Announces new Series Of Semiconductor Integrated Circuits Combining High Speed And Low Power Advantages -- Solid Circuit Series 54" Nat Semi's website history pages quote 1970 as the year they made money >from TTL 74xx series. But the earliest I can find in my Texas data books for MSI is 1972 for the 72181, same as Philip. The data sheets for the SSI are obviously older than that. Curiously, although there's lots of information on TI's own company information pages in the "Innovations" section, they don't mention TTL. The only relevant items are a press release on June 23, 1964 about granting of patents including "Features of integrated 'AND gates' and related devices" and mentioning that "Current Texas Instruments SOLID CIRCUIT? semiconductor networks contain up to 69 component equivalents formed within a single bar of ultra pure silicon material". That's not 54/74 series TTL, though, it's 51-series. The other is a reference to "1972: first ABACUS-II wire bonder, enabling high-volume IC production." There's some information on that at http://www.ti.com/corp/docs/company/history/abacus.shtml which I found very interesting as I used a manual wire bonder on a visit to Ferranti around 1972. -- Pete Peter Turnbull Network Manager University of York

25 years, 1 month

3
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LA210 problem with the control lines

by GOOI＠oce.nl

Hi all. Yesterday I connected my LA210 Letterprinter to the printerport of a VT102. Both are set at 9600 Bd, 8 databits, no parity and 1 stopbit. However when I send some 5 characters from the VT102 to the printer, it prints many mirrored question marks and other 'strange' characters. Okay, I thought, the baudrate setting, etc. is not correct. But it is. These are the checks I have done so far. 1) The used cable is an original DEC BC22D-25. This cable is mentioned in the LA210 Letterprinter User Guide. 2) From the VT102 User Guide, I build the EIA loopback connector. It is a 25 pin D connector and has pin #2 wired to #3 and #15, pin #4 wired to #5 and #8, pin #20 wired to #6 and #22, and pin #19 is wired to #12 and #17. The VT102 passes the Printer Loopback Self-Test, ESC [ 2 ; 16 y 3) The LA210 passes the Internal Self-Test. Among others, it prints that the speed is 9600 Bd, so I know those DIP switches are set ok. It also print lines with all characters in it. 4) The LA210 I/O Loopback Tests only mentions to plug in a loopback connector. I assume I can use the same one as the one used on the VT102. The Loopback Test gives an error. The output text is: Control lines failed. (20 mA ?, jumpers ?) Data path OK Printing loopback <many lines with all characters in it> I do not understand the message "Control lines failed". I am using EIA, so it can not be a current loop problem. When I connect the BC22D to the VT102 and the LA210, the "Data Set Ready" LED on the LA210 goes on. Am I using the correct loopback connector on the LA210? Has anybody seen this problem before? I have no field maintenance print set of the LA210 .... kind regards, Henk Gooijen, PDP-11 collector http://home.12move.nl/~sh416008

25 years, 1 month

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Fwd: Alpha Computers Order

by jcook793＠yahoo.com

OK, so which one of you guys got it? :) -John --- cara <cara(a)ibuynw.com> wrote: > Reply-to: <cara(a)ibuynw.com> > From: "cara" <cara(a)ibuynw.com> > Subject: Alpha Computers Order #1269 > Date: Wed, 16 May 2001 15:09:31 -0700 > > Hello John, I am sorry to inform you that the item that you ordered, > Apple > Lisa with floppy disk, is out of stock. Please remember us for all > your > computer needs. Thank you for shopping at Alpha Computers. > > Cara Bergeson > ibuyNW.com, a division of Alpha Computers, Inc. > Phone: 503-684-1111 ext. 251 > Fax: 503-639-4386 > Email: cara(a)ibuyNW.com __________________________________________________ Do You Yahoo!? Yahoo! Auctions - buy the things you want at great prices http://auctions.yahoo.com/

25 years, 1 month

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Storage medium for longevity of data

by mmcfadden＠cmh.edu

I seem to remember this thread awhile back. If you search the National Bureau of Standards site there is a reference to etching data onto iridium blanks. The Mormon Church is also interesting in retaining records for > 1000 years. Also look up references to optical tape. Other references include: http://www.slis.ualberta.ca/cap99/jvarney/preserve.htm Preservation of Digital Data http://www.nla.gov.au/niac/meetings/npo95rh.html The digital storage media examined are magnetic tapes and optical disks (including magneto-optical disks). For each medium the claims of manufacturers about their longevity, results of accelerated aging tests, and observations from field sites are presented. Recent research, including that presented by Jeff Rothenberg and by the National Media Laboratory, St. Paul, Minnesota, is noted. The paper concludes that there are at present too many unknowns to commit digital data to currently-available artifacts for anything other than short-term storage. The preferred option is to direct preservation efforts towards solutions which preserve the information content - the digital 'object' - rather than the digital 'artifact'. http://www.uky.edu/~kiernan/DL/hedstrom.html Digital preservation: a time bomb for Digital Libraries Mike mmcfadden(a)cmh.edu

25 years, 1 month

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Kaypro manuals available

by tim＠arti.vub.ac.be

Thank god for this site About two years ago i got a kaypro II in excellent condition, with a lot of original disks What I am interested in is an sbasic manual, -> ave some left? If anyone has some experience with connecting a HD to it, please let me know tim(a)arti.vub.ac.be

25 years, 1 month

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Heathkit Fall 1978 catalog now on-line; H-8, H-11, H-9 and ET-3400.

by mikeford＠socal.rr.com

>I have been looking all over for the model number of a fancy digital fm >tuner that heathkit made about 1978. It was unusual because it had a keypad Heathkit AJ1510, it was in the first half of the 70's, and it wasn't very good. One sold on eBay last month.

25 years, 1 month

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Storage medium for longevity of data?

by jss＠ou.edu

This topic came up on slashdot a week or two back, and I have been thinking about it ever since. And it's even on-topic, when asked a certain way. How resilient are today's storage media? In particular, is our classic computing data (tape/disk images, scanned documents, etc.) archived adequately enough that it's going to survive the next few centuries? One slashdot poster postulated that some EMR event (possibly the next magnetic pole reversal, or some sort of solar phenomenon) could wipe out nearly all of our magnetically stored data. Another user pointed out that even CD-ROMs expire eventually. One thing that came to my mind was our venerable friend the paper tape (an example of why it pays to remember the history of computing). I think it makes a darn good solution for archiving data and locking it away in a vault for a few millenia, provided some research was put into developing a tape paper (or other material) that would last longer and store data more densely than our traditional paper tape mechanisms. Any thoughts? -- Jeffrey S. Sharp jss(a)ou.edu

25 years, 1 month

3
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PDP 11/34 on EBay.... NOT!!!!

by vaxman＠qwest.net

Fair warning... The 11/34 that just showed up on EBay with a buy it now price of $899 and a reserve > 12.50 isn't an 11/34... I doesn't have a CPU... I does however have a paper tape control board, an operator panel, and a bunch of bus grant cards :) clint

25 years, 1 month

1
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Toshiba T3100/20

by sialenec＠yahoo.com

Hi there, I am having trouble getting my old Toshiba T3100 up and running. THe problem is that once it boots up it says "Incorrect Dos Version" and then "Bad or missing Command Interpreter" How can I get this thing running again? Mitch.

25 years, 1 month

2
1
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Where to buy Gorilla Banana printers?

by heatond30＠hotmail.com

Hi Doug, We have a Gorilla Banana Printer! It seems to be in good shape with the dust cover, manual, and old ribbon. We also have a ton of systems and componets ,and software (the good stuff)from that era, Commador 64, 128, 5.25 drives, Atari systems, and lots of other equipment. Printers like the big blue, Commador vic and others. We have the IBM PC jr system complete with monitor, printer, side parallel car, and extensive manuals. We have a lot of stuff from the 70's and 80's MAC performa 450 complete with software manuals modem, monitor, printer-Image Writer II, also a Apple IIgs with lots of attachments 5.25 & 3.5 drives, printer all complete! Windows 3.1 tower system complete has CD-rom, 5.25 1.2 mg, 3.5 1.44mg drives 2 hard drives 2.19.mg and 83.mg. Has Sound blaster card, modem, serial and parallel cards installed. Has the Calmira Final addition GUI (windows 95 desktop) installed. Mouse, Keyboard, Monitor, lots of software installed like Word, Powerpoint, Excel, and more! We have 5 - HP smartdesk Writers Color and black inkjet printers TOO! 386 boards, ISA cards lots more. We would like to sell it all if possible! Contact us at samcgee65(a)hotmail.com Thank you, Mark McGee

25 years, 1 month

1
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Where to buy Gorilla Banana printers?

by heatond30＠hotmail.com

Hi Doug, We have a Gorilla Banana Printer! It seems to be in good shape with the dust cover, manual, and old ribbon. We also have a ton of systems and componets ,and software (the good stuff)from that era, Commador 64, 128, 5.25 drives, Atari systems, and lots of other equipment. Printers like the big blue, Commador vic and others. We have the IBM PC jr system complete with monitor, printer, side parallel car, and extensive manuals. We have a lot of stuff from the 70's and 80's MAC performa 450 complete with software manuals modem, monitor, printer-Image Writer II, also a Apple IIgs with lots of attachments 5.25 & 3.5 drives, printer all complete! Windows 3.1 tower system complete has CD-rom, 5.25 1.2 mg, 3.5 1.44mg drives 2 hard drives 2.19.mg and 83.mg. Has Sound blaster card, modem, serial and parallel cards installed. Has the Calmira Final addition GUI (windows 95 desktop) installed. Mouse, Keyboard, Monitor, lots of software installed like Word, Powerpoint, Excel, and more! We have 5 - HP smartdesk Writers Color and black inkjet printers TOO! 386 boards, ISA cards lots more. We would like to sell it all if possible! Contact us at samcgee65(a)hotmail.com Thank you, Mark McGee

25 years, 1 month

1
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destinking the computers.

by xds_sigma7＠hotmail.com

Well, for what it's worth, my mom and her friend are janitors for banks, and as such, I could probably get about anything... Don't leave out good old Orange Clean, which is even made right here in my state... I'd imagine a lot of those cleaning things are available at Grainger, too... Will J _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

25 years, 1 month

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D connector tirade (was: Re: Age-old ethernet equipment)

by pete＠dunnington.u-net.com

On Mar 30, 19:49, Richard Erlacher wrote: > I'm glad I don't have to explain that. There is, by the way, another more > "current" name for the 3-row, 'E'-shell connector commonly seen with 15 pins in > it in VGA applications. I'm not remembering it, though. HD-15? -- Pete Peter Turnbull Network Manager Dept. of Computer Science University of York

25 years, 1 month

20
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My IBM 1130

by xds_sigma7＠hotmail.com

The correct term is "urinal CAKE" not cookie... it's that round thing in urinals that is an air-freshener, etc. At least I believe thats what it does... I sure as hell have no intention to sniff it to determine the accuracy of this.. Will J _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

25 years, 1 month

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Destinking Computers

by truthanl＠oclc.org

Date: 16 May 2001 0:50:25 +0100 From: "Iggy Drougge" <optimus(a)canit.se> Subject: Re: destinking the computers. jpero skrev: ....If it stinks after this treatment, I'd have no idea what to do next. My Sugesstion: Pack it with a dryer sheet. Dryer sheets also repell mice. I have a friend who does this to the interior of his 69 SS Chevelle. He covers the car on a cement floor in his pole barn. Dryer sheets under the seats got rid musty smell, and he also realized lack of mouse dropings. Prior years he'd find seat stuffing packed in a nest on the intake manifold, or some other unlikely place. Larry Truthan Digest subscriber truthanl(a)oclc.org

25 years, 1 month

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My IBM 1130

by xds_sigma7＠hotmail.com

Hey, I'm personally totally perplexed as to where it came from in the first place... I just wish I could afford the 1130 but I know someone will come out with some large amount of money and as always I'll miss out on another opportunity... I guess I could sell my PDP-8/i and some other stuff or something, except then I'd never have another PDP-8/i.. ugh.. I tried to look up weights, but IBM actually doesn't have info on the 1130 in the sales manual anymore, unfortunately. Will J _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

25 years, 1 month

1
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My IBM 1130

by xds_sigma7＠hotmail.com

Good God, some of us read e-mail while we are *eating*... ugh! _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

25 years, 1 month

1
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Need help identifying a MOSTEK chip

by pete＠dunnington.u-net.com

On May 16, 8:50, Norm Anheier wrote: > I need help identifying the function (ie what is it!) of a MOSTEK chip, > part number MK2488P with date code (?) 7429. If it's 1974, its a little > early for my data books. I can't find MK2488P. Nearest I can see is MK2400P (a 256-word x 10-bit mask ROM) or MK2408P (2400 programmed as a character generator ROM). -- Pete Peter Turnbull Network Manager University of York

25 years, 1 month

1
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My IBM 1130

by mcguire＠neurotica.com

On May 16, Will Jennings wrote: > The correct term is "urinal CAKE" not cookie... Oh, that's an entirely different product. The urinal *cookies* are only intended as a light snack, or perhaps for...dipping. "Stays crispy in milk!" [dave ducks under his desk to avoid being pelted with flying fruit] -Dave McGuire

25 years, 1 month

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74xx orgin

by pete＠dunnington.u-net.com

On May 15, 20:54, Sipke de Wal wrote: > If guess Fairchild was the company that first made the 54/74xx series > The 54xx had mil. specs the 74xx had consumer specs. Nope, TI made the first 54/74. Fairchild made other things, some of them before TI, but not 54/74 TTL (a least, not before Texas). -- Pete Peter Turnbull Network Manager University of York

25 years, 1 month

2
1
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Console bulkhead battery source

by ajp166＠bellatlantic.net

simpler... buy a threecell pack intented for cordless phones. Ratshack sells them and there are various form factors but they work. FYI don't worry the capacity, anything will do even three AA nicads (500mah) in a battery box(holder). Allison ------Original Message------ From: Paul Thompson <thompson(a)mail.athenet.net> To: classiccmp(a)classiccmp.org Sent: May 16, 2001 1:20:42 PM GMT Subject: Re: Console bulkhead battery source Good idea. With other battery packs I tried to use off the shelf batteries to make a new pack but had very poor luck in getting the solder to stick to the battery. It seemed like a spot weld was used to attach the wire rather than normal solder. I assume that your idea uses the existing leads in the battery pack to get around this problem. On Tue, 15 May 2001, Don Maslin wrote: > Get the four cell package, use your razor knife to remove the fourth > battery, resolder the lead from the fourth to the third cell and > install. --

25 years, 1 month

1
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Inside Altair BASIC - interesting!

by jfoust＠threedee.com

http://www.rjh.org.uk/altair/4k/ I especially like the way he points out that the error numbers from the pre-Microsoft 4K BASIC are still used in Visual BASIC today. Related articles: http://www.theregister.co.uk/content/4/18915.html http://www.theregister.co.uk/content/4/18909.html - John

25 years, 1 month

1
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Teledisk not working

by lgwalker＠look.ca

> > These assholes even claim that: > > > > "TeleDisk was developed to assist the U. S. Treasury Department > > in the processing of computer evidence tied to floppy diskettes." > > > > Does anybody know if this is *true*?! I always thought it was > > developed to distribute software via BBS's (and other electonic > > means). > > I believe it to be 100% false. The story I remember (probably read in > some Sydex documentation) is that Teledisk was written to help support > the CP/M disk reading software (was that called 22disk?). The idea was > that if you had a CP/M disk in a format that wasn't supported by 22disk, > you could use Teledisk to mail an image of the disk to Sydex so they > could attempt to add the format to later versions. > > In any case, teledisk is not that useful for extracting information from > a non-PC disk (which is presumably what the police, etc, would want to > do). I can really see the point of being able to make a copy of a disk > for some machine they don't have. Some program like anadisk, which lets > you read sector-by-sector, make disk images, and so on, would be a lot > more useful to them I would have thought. > > -tony > Someplace among my 5.25 disks I have a zipped early shareware copy of Teledisk that I downloaded from a BBS around 92-93. I remember it had some sort of lame disclaimer to the effect that it was not to be used to circumvent copyright restrictions. I thought at that time it was just a legal cover for their asses and certainly looked like a way around copy-protection. larry Reply to: lgwalker(a)look.ca

25 years, 1 month

4
5
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Need help identifying a MOSTEK chip

by norm.anheier＠pnl.gov

I need help identifying the function (ie what is it!) of a MOSTEK chip, part number MK2488P with date code (?) 7429. If it's 1974, its a little early for my data books. Thanks Norm

25 years, 1 month

1
0
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Rescue in Madison/Monona, WI, USA

by jfoust＠threedee.com

A friend is moving from the Midwest to the West coast, so he's liberating himself of all his antique computers except for his IMSAI. This means the rest goes... this includes two Kaypros, a TRS-80 Model I w/Expansion Interface, an Apple ///, and maybe a TRS-80 Color Computer, plus various other stuff. No charge if you say "John Foust told me about it." :-) They're having a rummage sale starting tomorrow. Anything left goes on the curb. Questions to Mike and Becky Winter <mwinter(a)execpc.com>. (Battlebot freaks may recognize his name.) Location is http://www.switchboard.com/bin/cginbr.dll?ID=101809742&MEM=1&FUNC=MORE&TYPE… - John

25 years, 1 month

1
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looking for SS-50 people, especially non-SWTPC

by chomko＠greenbelt.com

I'm wondering who collects SS-50 bus stuff. I'm interested in who has systems like Smoke Signal Broadcasting (Chieftain), Helix, Gimix, Midwest Science Instruments (MSI). Thanks, Eric

25 years, 1 month

3
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Fwd: Completed Floppy Disk Controller Design

by jhellige＠earthlink.net

For those interested in the SWTPc and SS-50 bus machines: >Status: RO >Sender: fufu-l(a)telia.com >Reply-To: fufu-l(a)telia.com >Date: Mon, 14 May 2001 08:47:25 -0700 >From: "Michael Holley" <holley(a)mail.hyperlynx.com> >To: Multiple recipients of fufu-l <fufu-l(a)telia.com> >Subject: Completed Floppy Disk Controller Design > >I have finished the design of a new floppy disk controller for the S30 I/O >bus. The card emulates the SWTPC DC-4 with a few additions. The design uses >a Western Digital WD2797 FDC that supports double density format. The WD2797 >is a superset of the WD1797 and WD1691 and is software compatible. > >The card will fit in an old 6800-style case or the newer 6809-style case >with the connectors coming out the back. The clock frequency is programmable >so the card should work with 3.5-inch drives. > >The design is complete but needs to be reviewed.(There are errors and >omissions.) After a few weeks of review I will have 2 (or 4) boards made. I >am looking for someone who has a system with SS30 I/O bus to help debug the >board. After the design is tested I will order 10 or so boards with >silk-screen and solder mask. > >The design documents can be found at: >http://members.aol.com/swtpc6800/FDC2/FDC_Index.htm >I still have some design documents in process and will add them when they >are done. > >The difficulty I was having with a discrete logic design was board layout. I >was going to use some 20-pin programmable logic devices such as the 16V8 but >programming them is difficult. (I have an old Data I/O Model 29 programmer >but I haven't turned it on in 10 years.) I was looking for an in-circuit >programmable device. > >I decided to use the Xilinx XC9500 CPLD family. They are low cost ($6), the >development software is free, and the programming hardware is simple. >Another reason is that I have worked with these devices since they were >developed by Plus Logic in the late 1980s. Somewhere I have a Plus Logic >2020 engineering sample. The development software is based on the ABEL and >Synario software that I developed at Data I/O. > >I chose the XC9572, which has 72 Macrocells and comes in an 84-pin PLCC >package. This device holds all of the discrete logic devices needed in the >design. The timer IC and one-shot IC are external along with the buffers. I >could have connected the disk drive directly to the CPLD but I felt the low >cost buffers would be easier to replace in the future. The device is >re-programmable so design changes are easy. I am only using about half of >the device now. > >For the PCB layout I went with ExpressPCB because they have free software >and they do low cost double-sided boards. A friend of mine has had good luck >with them. I have access to very high-end PCB layout software at work but I >want the design to be public domain. (If I published the design files in >PADS format you would have to buy a $10,000 PADS PowerPCB software package >to modify them.) > >After the layout is done I will publish the PBC file. If someone wants to >review the current design I can email you the file. > >The only rare part in the design is the WD2797; I bought 10 of them from BG >Micro before I started the design. The rest of the parts are available from >Digi-Key with exception of a few ICs that I found at Jameco. The complete >kit of parts cost $50 plus about $40 for the circuit board. I am going to >acquire enough parts to build 10 boards. > >I still need to write the calibration procedure and add the required test >point to the board. I just noticed a trace clearance problem near pin one of >the 34-pin connectors. > >The DDEN line is controlled by the CPLD so we can add the logic for MS-DOS >floppies. This logic in not in the CPLD yet. >----------------------------------------------- >Michael Holley holley(a)hyperlynx.com >Innoveda >Phone: (425) 869-2320 Fax: (425) 881-1008 >Direct Line (425) 497-5075 >----------------------------------------------- >-- >FLEX & UniFLEX Users' mailing List >http://www.flexusergroup.com/ >http://w1.503.telia.com/~u50302970/ > > -- Collector of Classic Microcomputers and Video Game Systems: Home of the TRS-80 Model 2000 FAQ File http://www.geocities.com/siliconvalley/lakes/6757

25 years, 1 month

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processors.

by geoffr＠zipcon.net

looks like they are all spoken for, I will be getting back to those that have already emailed me to make arrangements to got them to y'all. :)

25 years, 1 month

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Intel 4004

by per_son＠fuse.net

Dear Dwight, I have just obtained a C4004 and its supporting chips and am very interested in learning how to write some code for it. I read from http://www.classiccmp.org/mail-archive/classiccmp/1999-02/0689.html that you have made some tools to do this. I am an EET student so I don't have a whole lot of experience in programming. I have written machine code for the Motorola 6800 series but that's about it. I am VERY interested in learning more about it though. If I can pull it off I would like to do this as a final project for school. My main problems are actually writing and compiling code and coming up with the two phase clock that this chip requires. If you can help me at all it would be GREATLY appreciated! I am willing to pay for your software as I am sure it took a lot of hard work to create it. Thanks, Josh

25 years, 1 month

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destinking the computers.

by xds_sigma7＠hotmail.com

OK, well so far none of those solutions seem likely to help me... The computer in question has a unique odor, not mouse/mold/cigarette/anything else mentioned before generated, nor is it one I recognize, and I've driven it down the road in the back of a pickup mostly disassembled at speeds in excess of 45MPH... And it still FREAKING REEKS! I'm not making a joke, but my Wang really smells... And its a funky smell, sometimes not present, and other times you can smell it even with the front door shut... I'd really like to eradicate the odor, though much joke potential will be lost... Suggestions? _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

25 years, 1 month

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Token Ring coax?

by optimus＠canit.se

While oogling all the pretty Apollo pictures at http://www.citi.umich.edu/apollo-archive/photo-gallery/ , I found two puzzling pictures: http://www.citi.umich.edu/apollo-archive/photo-gallery/apolloXrnsXautolab.j… http://www.citi.umich.edu/apollo-archive/photo-gallery/apolloXrnsXautolab2.… They're described as a "Token Ring Remote Network Switch (RNS)", but then what are all that coaxial wiring doing there? All TR which I've encountered has been either TP or those frightening IBM connectors. What is the meaning of all this? -- En ligne avec Thor 2.6a. JavaScript has been developed to show scrolling messages on your pages. It should have been named ScrollerScript, but as it came out more or less the same time when the hype on a programming language called Java (poor man's SmallTalk raped by C++ which is expected to solve all problems of the world, including traffic, pollution and AIDS) started, it's creators decided to use the term ``Java'' in it's name, too. -- README for the HTML preprocessor "hsc"

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IBM CICS manuals or other information

by BeaumontDawson＠aol.com

Hello out there, does anyone know where I can get hold of information on the follwing old IBM products (manuals/microfiche etc) products ----------- 5798-AXC 5796-AEF manuals ---------- SH20-1358 G320-8088 SN20-6277

25 years, 1 month

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74xx orgin

by Hans.Franke＠mch20.sbs.de

When where the first 74xx ICs released / designed ? Especialy when where complex chips like 744x, 748x or 74181 first mentioned/available ? This may be a stuipd question, but I couldn't find any information ... so all I have is my personal guess (~1970) and the oldesd TTL book Philip Belben could find (1972). Anyone more informed ? Gruss H. -- VCF Europa 3.0 am 27./28. April 2002 in Muenchen http://www.vcfe.org/

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74xx orgin

by ajp166＠bellatlantic.net

From: Sellam Ismail <foo(a)siconic.com> >I think you guys are going to have to use DTL. If TTL was even around in >1970, it was probably pretty expensive at first. It existed in 1970. By 1973 it was widely used. My Yasu Freq counter (good to 350mhz) was purchased in 73 and contains: 7490 decade counter (usually good to 35mhz then) 7475 quad latch 7441 Decimal decoder and Nixi driver. 7400 7404 74Sxx parts were a year or two later. Allison

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DRV11-WA info

by xds_sigma7＠hotmail.com

Hey I just felt compelled to make a joke.. and keep in mind it was like 1AM my time... Is there a SNAFU register as well? Just wondering... I need to have SEX with all my Interdata's/Perkin-Elmer's... heh, thats the "System Excerciser" _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com

25 years, 1 month

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FDCs -- was Re: TELEDISK Problem

by pete＠dunnington.u-net.com

I've not had the time I hoped to sort through my FDCs* and pick likely candidates for 8" operation (and SD for 5.25" as well), but I do want to thank Tony, Allison, Don, and everyone else who provided useful information. * Partly because I spent most of the weekend repairing two 8" drives -- one of which was only bust because of my own carelessness :-( -- and sorting out surplus equipment which I'll offer to the list in due course. -- Pete Peter Turnbull Network Manager University of York

25 years, 1 month

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Apollo Token Ring

by ndiablo＠diablonet.net

As stated before, this is a just a daisy-chain ring type network (that is, the ring is both physical and logical) that operated using a token-passing scheme. It was proprietary to Apollo as far as I know. I've got a few of these cards laying around, unfortunately without machines to go with them. They're full-length ISA-bus cards with something like a 6W2 (six pins and two BNC-type connectors ala a 13W3 monitor connector) that one would connect a small dongle to. The dongle has two BNC ports on it ("in" and "out"). Interesting stuff... --Sean Caron (root(a)diablonet.net) | http://www.diablonet.net

25 years, 1 month

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destinking the computers.

by jeff.kaneko＠juno.com

Oh yea-- that's the same stuff they use in Hospitals, right? I always wondered why they all smelled *exactly* the same :^). Isn't that stuff usually allowed to 'wick out' a cotton pad stuck in the bottle? Jeff On Tue, 15 May 2001 15:16:45 -0400 "Michael Nadeau" <menadeau(a)mediaone.net> writes: > Used car dealers have something that they use to get rid of nasty > odors--cigarette smoke, etc. I don't know what it is, but any > service > department should be able to tell you what it is and how to get it. > > It generally works at eliminating the offending odor, but it leaves > its own > sweetish smell behind. > > --Mike ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for less! Join Juno today! For your FREE software, visit: http://dl.www.juno.com/get/tagj.

25 years, 1 month

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Old chips for new project.

by chronic＠nf.sympatico.ca

I'm interested in the exact same thing you are at this point. I'm workin on a 6502 board, i hope to have it finished soon, i may put some schematics on my web page. For info about the 6502 and projects, you cannot beat http://www.6502.org, Chris Ward's 6502 board in particular. For 6502-related books, the best i have found have been Programming the 6502 and 6502 Applications, by Rodnay Zaks. Keep an eye out, they may show up on EPay if you're lucky. As for the processors themselves, I recycled my 6502 out of an old 1541 disk drive that didn't work, and i recently found a Z80 in a PC/AT keyboard i cannibalized (albeit for the LEDs, how ironic). Anyone else out there have any advice/suggestions??? -Lanny ----- Original Message ----- From: <rhudson(a)cnonline.net> To: <classiccmp(a)classiccmp.org> Sent: Monday, May 14, 2001 10:02 PM Subject: Old chips for new project. > Hi all! > > It's not exactly classic, but... > > Are any of the 8 bit processors still available? I would like to scratch build > a z80 or 6502 or somthing board to hook up to my > > vt220 (ob classic??) > > I have **no** hardware experince (well I can solder, but beyond that...) > > Hints?? > > Thanks! > > > > > > --------------------------------------------- > This message was sent for FREE using Shot-mail. > http://www.shot-mail.com/ > > >

25 years, 1 month

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Infoserver 1000

by dittman＠dittman.net

I just got an external Infoserver 1000. Can anyone provide the pinouts for the power connector, or even better, does anyone have a spare power supply? -- Eric Dittman dittman(a)dittman.net

25 years, 1 month

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destinking the computers.

by mcguire＠neurotica.com

On May 15, Vance Dereksen wrote: > MMMmmmMMMmmmMMM... Alconox. Tastes great with milk! -Dave McGuire

25 years, 1 month

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NeXTs?

by spectre＠stockholm.ptloma.edu

Whatever happened with all those NeXTs that were bought at the auction? I haven't heard anything since :-/ Still interested! -- ----------------------------- personal page: http://www.armory.com/~spectre/ -- Cameron Kaiser, Point Loma Nazarene University * ckaiser(a)stockholm.ptloma.edu -- FORTUNE: You will be hit with a lot of money. Avoid armoured trucks. -------

25 years, 1 month

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destinking the computers.

by mcguire＠neurotica.com

On May 15, jpero(a)sympatico.ca wrote: > Alcohol do very little to dislodge junk and only kills bugs and > mildew but the remains stays there and still smell. > Even the windex help very little it's consumer grade. Very weak. > > What I'm looking for is real thing that oxidizes the stink and get > all the dirt and junk floating out of hidden cravities with a flush. Perhaps something like Alconox? I've seen that stuff do amazing things. -Dave McGuire

25 years, 1 month

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VCF East 1.0 - July 28/29 in Marlborough, Massachusetts!

by RCini＠congressfinancial.com

Who's going to VCF East?? I was toying around with going and wanted to see who from the list would be there. Rich -----Original Message----- From: Vintage Computer Festival [mailto:vcf@siconic.com] Sent: Wednesday, May 09, 2001 12:46 AM To: Classic Computers Mailing List Subject: VCF East 1.0 - July 28/29 in Marlborough, Massachusetts! It's finally official! VCF East 1.0 July 28-29, 2001 10am to 5pm daily Best Western Royal Plaza Hotel and Trade Center Marlborough, Massachusetts Admission $10 daily at the door Speakers Want to give a talk at VCF East 1.0? E-mail me at <sellam(a)vintage.org>. Exhibitors Sign-up your exhibit at http://www.vintage.org/2001/east/exhibit.php3 Vendors Want to sell vintage computer stuff at VCF East 1.0? Contact me at <vendor(a)vintage.org>. More info to come soon, including updated VCF East 1.0 web pages with speaker schedule, exhibits and more! Sellam Ismail Vintage Computer Festival ---------------------------------------------------------------------------- -- International Man of Intrigue and Danger http://www.vintage.org

25 years, 1 month

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