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More Commodore Documentation

by billdeg - 06/30/2007
Total messages in this thread: 1
New to inventory 1. Service Manual B Model Computer 1985 P/N 314010-06 2. CPM/86 Commodore BX Source BIOS 3. Misc Compute! articles 4. CBUG Issues 1985-87, Northwest Computer News 1987-92 5. IEEE-Centronix Interface W/ Software Configuration Tips, Superscript II, etc 6. CBM ROM Genealogy plus misc. technotes 7. 2023 Printer 1978 machine lang/source 8. 4040 Disk Drive Source 9/ B-128 Fast Bus v. 2.0 10/30/88... [ read more ]

Commodore Service Manual

by billdeg - 06/29/2007
Total messages in this thread: 1
Recently I got a Commodore Service Manual full of documentation. Housed in a very large 3-ring binder titled "Commodore Service Manual" CONTENTS 1. Commodore Training "Lecture Notes" by Spiro Omfalus 5/80 -Commodore 3000 Series. Troubleshooting/Schematics/Jumpers/etc --PET --Cassette --Floppy --Printer 2. Commodore Techtopics 1980 "Techtopics Bulletin" Diagnostics Testing Upgrade/Tips DOS version 2.1 BASIC 2 Schematics etc. 3. Commodore Technical Support Bulletin 4. Tech Notes 1983 (re-print from 1981, 170 pages) -CBM 8300P -Software Newsletters '81-82 -Regional Newsletters '81-82 --VIC 20 / 8032 / 2031 drive -Schematics... [ read more ]

Epson PX-8

by billdeg - 06/23/2007
Total messages in this thread: 1
Coming of a complete Epson Geneva PX-8 laptop with external drive, printer, and modem. Dbase II ROM, communications software, more.... [ read more ]

Using Toggle Switches to Analyze Memory

by billdeg - 06/20/2007
Total messages in this thread: 1
Ever wonder how to read memory using toggle switches on an old Altair computer? I gave a talk at the Vintage Computer Festival (Power Point) titled Download Vintage Computer Hardware 101 Featuring the MITS Altair 680b. ... [ read more ]

Vintage Computer Festival VCF E 4.0

by billdeg - 06/15/2007
Total messages in this thread: 1
More to come on this subject, but for now, here are some pictures. The event was quite a success. Thank you Evan Koblentz ( ) for making this event such as success. Visit the Vintage Computer Festival East 2007 web site ( ) for more details. Pics from the event: More to come... ... [ read more ]

Lobo Max 80 - Works!

by billdeg - 06/02/2007
Total messages in this thread: 1
Finally after two years I got some working boot disks, (note the file dates for newer pictures): Not pictured, 5 1/4" Percom disk drive used to book LDOS 5.1.3 "v. MAX513" The disk that came with the system Lobo CP/M 2.2 did not boot.... [ read more ]

Prototype PET 2001 photo

by billdeg - 05/26/2007
Total messages in this thread: 3
Last Post: [ Jan 1977 PET photo ] 08/13/2008
While doing some reasearch on my exhbit, I came upon a copy of Byte October 1977, and on page 54 there is an article about the National Computer Conference in Dallas, TX June 13-16. On that page is a picture of a prototype PET 2001. http://www.vint...e/2001-8/magazine/ I posted two scans, one blown up so you can read the face plate. ...this is to my knowledge the first known photo from a magazine of a CBM PET 2001, and a prototype to boot. BUT this is not the first known photo (Seach this site for "gametronics") - Note that the mag pic PET plate reads: "PET Computer 2001" on the front right (as seen in the blown-up of the two scans). SO - If the Dallas convention marks the first public appearance of the PET 2001. This event coincides with the VCF E ( ) - 30 years ago to the day, minus one week. Bill... [ read more ]

Morrow Wunderbuss Motherboard - Fried!

by billdeg - 05/23/2007
Total messages in this thread: 3
Last Post: [ Morrow Wunderbuss Motherboard - Fried! ] 05/25/2007
Recently I picked up an IMSAI 8080 with a Morrow Wunderbuss Thinker Toys Motherboard. From this picture: http://www.v...ss_mb_s-100.jpg Note the fried electolytic capacitor. I am going to pick up the schematic tomorrow, and I have ordered replacement parts. More later... [ read more ]

MITS 8800B - Working

by billdeg - 05/23/2007
Total messages in this thread: 1
Here are some updated pictures. [ read more ]

On cleaning of PET keyboards...

by Bryan Pope - 05/22/2007
Total messages in this thread: 1
I recently cleaned a PET 4032 keyboard by following the directions from the bottom of this page: On this particular keyboard keys like Return and 0 on the keypad were almost non-operative. But after the cleaning, the whole keyboard is working like new! :) I believe that the most important thing to clean is the black graphite that comes in contact with the gold fingers on the keyboard. On the most used keys I noticed it was shiny and had a type of imprint like the gold fingers it would be constantly coming in contact with. I used the eraser on these till the black graphite wasn't shiny anymore and the imprint was no longer visible. Unfortunately this same procedure cannot be done on that PET 2001 with business keyboard as the "switch" for each key is inside each key. I may be able to bring these metal fingers back to life by spraying th... [ read more ]

Epson DOS

by ianmlong - 05/21/2007
Total messages in this thread: 1
We have an industrial machine (a Wire EDM) which is about 11 years old which runs on an Epson 486 PC. We have lost our copy of Epson DOS 3.1 – the FORMAT & SYS files are what we really need – we do have COMMAND.COM. Epson’s DOS seems to use a different to MS DOS as MS DOS 6.1 will not read 3.5” floppy drives with Epson readable data on it. We would much appreciate any assistance anyone could give us. ... [ read more ]

Update - MITS Altair 680b

by billdeg - 05/02/2007
Total messages in this thread: 1
I spent a number of hours working on this system. I reviewed the documentation, tested the memory, and I picked up a ACIA monitor ROM from a kind member of the Altair Computer Club. All seemed to be working, but I was unable to send output through the RS232 port to a display/monitor. I brought the system to the Trenton Computer Festival to meet with other members of my computer club, the Mid Atlantic Retro Computing Hobbyists ( Dan Roganti, Brian Applegate, and Brian Pope helped locate and fix a wiring problem (wrong pin connection in the RS232 connector) and now the system communicates with a terminal, displaying the dot prompt.... [ read more ]

How to make a MS IBM DOS 1 boot disk

by billdeg - 04/11/2007
Total messages in this thread: 2
Last Post: [ IBM DOS 3.3 Disk ] 11/16/2010
How to make a DOS 1.1 boot disk for an IBM PC with 360 K 5 1/4" drive: 1) download all files including the util directory: You will need to (somehow) copy these files onto a blank, MS DOS formatted (any older version), but NOT bootable 360K 5 1/4" disk. 2) with blank disk in drive A, run command chkdsk /v to verify that you have no files on the disk 4) copy the files to the 360 disk 5) assuming the disk is in drive A and you copied to a dir on the diskette called "util", enter the following command: util\attr -S -H ibm*.com [enter] 6) with the newly-prepared disk in the drive, reboot. 7) assuming all goes well, at the prompt enter the "ver" command to verify that you have DOS 1.1. If you have problems, reboot using newer DOS version and try chkdsk /v with... [ read more ]

Commodore PET 2001 Photos

by billdeg - 03/10/2007
Total messages in this thread: 4
Last Post: [ Commodore PET 2001 Photos ] 03/14/2007
A fellow Commodorian met me at my house today to help work on some PETs we have. In total 4 PET's were worked on today from less than functional systems 1) 2001-8 (sn 29652)- when tape loading program, some junk appears on screen see #2 below) 2) 2001-8 (sn 20343)- (bad keyboard replaced) 3) 2001-32B (bad power supply replaced, monitor fixed see #1 below) 4) 2001-16N - (not fixed: RAM (?) 5) also semi restored a CBM 8250 disk drive using a B-128. Was not able to header a disk, but could read directories in drive 0. Lessons learned: #1 If your monitor is hissing pretty loudly but there is no smoke, the suction cup connector may have come dislodged from the inner picture tube chassis - re-attach #2 If you are having issues loading programs from the tape such as garbled characters appearing on the screen, try loading the programs on an external tape drive by d... [ read more ]

HP 2000A Reference Guide Scans Avail.

by billdeg - 03/09/2007
Total messages in this thread: 1
I have posted scans for the Hewlett Packard "A quick reference to HP Time-Shared BASIC" The guide was printed in 1969 for users of the HP 2000A. [ read more ]
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