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Re: Subject: Looking for Tektronix 4012/4014 character generator ROM dumps (EA4001 / 156-0296-00, 156-0293-03)

by Fabio J.W.

>You are aware of Rene Richarz's excellent 4014 emulator ? Unfortunately that emulator uses a standard font (monospace) from the graphic library cairo so it's not historically accurate -- Fabio Montarsolo

6 hours, 24 minutes

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Subject: Looking for Tektronix 4012/4014 character generator ROM dumps (EA4001 / 156-0296-00, 156-0293-03)

by Serhii Bielov

Hello, I'm working on an emulator of the Tektronix 4010-series storage-tube terminals. The one thing I can't find documented anywhere is the dot pattern of the 4014's alphanumeric character set (a 7 x 9 dot matrix, scanned column by column). The character generator uses three ROMs: - 4012 (service manual 070-1461-01): U465 = 156-0296-00, an Electronic Arrays EA4001 (64 characters, 7 x 9, 9 outputs), and U479 = 156-0293-03, a Tektronix-coded ROM. - 4014/4015 (service manual 070-2303-00): ROM A U305 = 156-0296-00, ROM B U325 = 156-0293-03, and on the 4015 the APL ROM C U315 = 156-0294-03. Any of these would help: 1. A dump of 156-0296-00 (EA4001) and 156-0293-03, and of 156-0294-03 if you have a 4013 or 4015. 4013/4015/4016 boards may carry the same parts. 2. The Electronic Arrays data sheet or 1973-74 catalogue page for the EA4001 -- it is a standard-pattern part, so its font may be printed there. 3. A sharp close-up photo of a 4012/4014/4016 screen showing the full character set in one of the two smaller character sizes, where the beam wiggler does not fill in between the dots, so the dots can be counted. (The photo in the 4014 User's Manual, Fig. 1-4, is a halftone and does not resolve them.) I'd be glad to pass whatever turns up back to bitsavers and TekWiki. Thanks, Serhii Bielov

21 hours, 49 minutes

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sun OS backup tapes

by Bill Degnan

I have been doing work commercially to recover SunOS 4.1.4 era (early 90s) backup tapes... anyone need this service? I have a good solid system set up to reconstruct the original file system from tape on the bench at the moment.. before I switch to VMS for my next project, let me know.

2 days, 13 hours

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DSI NC-2400 Papertape Reader / Punch for Sale

by Bill Degnan

DSI model NC-2400. https://vintagecomputer.net/temp/DSI2400_TapeReaderPunch/ I am going to try to bring this to the swap at System Source in November, but if anyone is interested before that contact me through vintagecomputer.net/contact.cfm to make an offer. I am thinking around $500 because it's tested and jumpered for rs232 2400 baud for easy use. Not perfect, but it does read and write tapes. A person has to keep a little tension on the tape as it pulls through the reader as it is now, but that may be because it needs to be re-greased. What's important is that it reads the tapes correctly. Comes with a new spool of tape, manual, gender changer, power cable, test tape. I have tested reading and copying a tape successfully with the unit. I am selling because I have a same-spare and I am clearing out duplicate hardware as time permits. Located in Landenberg, PA. I am willing to meet 1/2 way if it's not too far, or will consider shipping but I much prefer to sell either at an upcoming event or if you're ok with picking up in Landenberg, PA (near the University of Delaware). I accept cash, credit card, paypal, venmo, cashiers check. Hoping someone can use this. Bill

3 days, 1 hour

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Re: S-100 PDP-11 Processor & Support boards

by Stephen Pereira

Thanks for the pointer, Will. I’ll try there next. smp - - - Stephen Pereira Bedford, NH. 03110 KB1SXE

1 week, 1 day

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IBM House P/N to Manufacturer P/N Cross Reference?

by Sean Ellis

Hi all, I've got a collection of IBM 4683 point-of-sale equipment that I've been working on restoring and documenting this year. One of the planar boards in this collection is bad, and I'm trying to figure out what exactly is bad on it. Of course, every part on the board is marked with IBM's house part numbers. Does anyone have a better cross-reference list than what's on Bitsavers? Using that list I was only able to cross-reference the 74xx TTL chips on the board, none of the active chips. From my understanding of IBM hardware in 1986 and reading what few technical reference manuals still exist, I have a pretty good idea of what -should- be on the board, I just can't prove what's on the board: - Intel 80286 CPU - ~1MB of RAM (probably SRAM; not sure if the RAM bank is parity) - Dallas DS1220Y NVRAM (the only non-IBM labeled part on the board) - Big UV-erasable Intel chip (purple ceramic, almost certainly an 8042 or 8051) - Two additional Intel chips next to the UV chip (serial UARTs? Other MCS glue? they have different IBM P/Ns) - A couple of Hitachi chips, I suspect these are SRAM chips for the microcontroller section - Two 2716 EPROMs (hi byte and lo byte BIOS ROMs - I was able to confirm this from an arcade repair forum thread; ROMs were dumped and appear to have dumped OK) - Two or three large ASICs (One is manufactured by OKI, the other two have permanently glued heatsinks) I will get the IBM P/Ns later tonight... currently toiling away in the day job mines... Sean Ellis The Crusty Computer Club Secretary, Webmaster, RPG ILE Wizard https://crusty.computer

1 week, 2 days

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Reminder: October CCC Repair and Camaraderie Meeting in Glen Ellyn 17-Oct-26

by Mike Katz

Reminder: The next meeting in Glen Ellyn of the CCC Hardware Repair and Discussion will be held on October 17, 2026. Meeting Starts at 2:00PM and we will order pizza around 6pm or so. I hope to see you there, Mike Katz 385 Saint Charles Rd Glen Ellyn, IL 60137 +1 (773) 414-1044 (Cell)

1 week, 2 days

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Service manual/schematics for Exxon Qyx Intelligent Typewriter?

by Nicholas Van Wey

Hello all, I'm looking for technical documentation for a 1980 Exxon Qyx "Intelligent Typewriter," Level 2 -- the Z80-based word-processing typewriter from Exxon's short-lived office systems era. The machine I have doesn't power on, and I'm trying to get it repaired. The problem: no service manual or schematics seem to exist anywhere online (checked Bitsavers, Internet Archive, etc.), so any tech would be reverse-engineering the power supply blind. Does anyone have a Qyx service manual, schematics, or other technical docs they'd be willing to share, scan, or sell? User manuals and software disks also of interest. Happy to cover copying/postage costs. For reference, this is the same model held by Museums Victoria (Level 2, tested 30-07-80). I saw a 2002 thread here where someone mentioned having Qyx manuals and software -- if you're still out there, I'd love to hear from you. Thanks, Nicholas Dallas, TX

1 week, 2 days

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S-100 PDP-11 Processor & Support boards

by Stephen Pereira

I am interested in obtaining the V2 PDP11 S100 Bus CPU Board, and the PDP11 S100 Bus Support Board, that originated on John Monahan's s-100 computers site: https://s100computers.com/My%20System%20Pages/PDP11%20V2%20Board/PDP11%20Bo… https://s100computers.com/My%20System%20Pages/PDP11%20Support%20Board/PDP11… To complicate matters, I cannot do the board assembly myself, so I would like to acquire them as built & tested boards. Can anyone here point me to any person or any site that might be able to assist me in this acquisition? Thanks very much in advance for any insights, pointers, or suggestions you may have. smp -- Stephen M. Pereira Bedford, NH 03110 KB1SXE

1 week, 2 days

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VCM Midwest PiDPs still available

by Mike Katz

I have the following PiDPs and Enigmas that didn't sell at the VCM Midwest show. Please contact me directly (bitwiz(a)12bitbest.com) if you are interested: 2 PiDP-1 Console Kits ($265 plus shipping) 2 PiDP-1 Rack Kits ($460 plus shipping) 2 PiDP-8 Kits ($220 plus shipping) 2 PiDP-10 Kits ($415 plus shipping) 1 PiDP-11 Kit ($315 plus shipping) 1 Enigma Touch Double Case ($565 plus shipping) 1 Enigma Touch Double Panel ($465 plus shipping)

1 week, 2 days

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