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CBM KIM-1 Rev G Restoration

by billdeg - 05/19/2013
Total messages in this thread: 4
Last Post: [ Photos Commodore KIM-1 Rev G ] 08/27/2014
Started project to restore a non-functioning Commodore Kim-1 (Rev G). Working with a number of attendees at the Spring MARCH workshop we concluded that the 6502 socket was bad. I also replaced the dual timer chip in U25.
More to come.... [ read more ]

BASIS 108

by billdeg - 12/10/2012
Total messages in this thread: 2
Last Post: [ BASIS board maint. ] 05/14/2013
BASIS 108 Apple II Clone Computer
The West German-made BASIS 108 was an Apple II clone with a Z80 processor and built-in video features. This unit has 128K RAM. Click image for larger view.
System power checked out, clean inside, boots Apple Pascal OS. No obvious restoration needed. After a more thorough check-out, I will explore the monitor program (6502) and attempt to boot CP/M, and Apple II programs in color. Photos... [ read more ]

Motorola MEK6800D2 Microcomputer

by billdeg - 01/05/2005
Total messages in this thread: 3
Last Post: [ Motorola 6800 JBUG Monitor ] 04/25/2013
1-10-05 Pictures htt...otorola/mek6800d2/ I have not yet tested this single board computer. I have the manual, it's very good, should be fun. Requires a 5V DC @ 2.5 MA. I have to splice up an adapter, etc. ... [ read more ]

B 128 Alternative OS Expansion Board

by billdeg - 04/15/2013
Total messages in this thread: 1
The Anderson Communications Engineering Alternate Operating System Expansion Circuit Board for the Commodore B Series computer
More to come!... [ read more ]

Intersil 6100 PDP 8 Homebrew System

by billdeg - 03/28/2013
Total messages in this thread: 1
Took a few photos of a homebrew Intersil 6100 PDP 8 Homebrew computer built by William F. Dudley Jr. which he donated to MARCH.
More photos I did not get a chance to photograph the ROM card (need to download the 2708 ROMs) nor the processor card. The front panel is a primitive four-digit octal dial. Here is a thread from Mid-Atlantic Retro message board: William F. Dudley Jr. donated another wonderful box of homebrew parts to MARCH: a new unused Intersil 6100 eval kit, several PHI-deck digital cassettes (2 in the original blue eval cases), spare memory cards and schematics. The intention was to build a PDP8 using the 6100 chips and the PHI decks emulating DECtapes to run OS8 and all the PDP8 software. Each memory card is 4k of 12 bit DRAM, 8 max per system. ... [ read more ]

Trenton Computer Festival 2013

by billdeg - 03/17/2013
Total messages in this thread: 1
Mark 8 Minicomputer display at Trenton Computer Festival 2013
Who wouldn't be smiling if they had a beautiful Mark 8 to feature at their computer exhibit? MARCH is proud to have received (on loan) an original Mark 8 computer for our computer museum. The system came to us from David Larson curator of the BugBook Museum located in Floyd Virginia. The Mark 8 was designed by Dr. John Titus and this particular Mark 8 was built by George Overfelt in 1975. The Mark 8 will be displayed within the MARCH vintage computing exhibit within the Infoage Science Center in Wall, NJ. Click image for larger view.
Herb Johnson Heathkit H8 Tren...<strong> <a href=[ read more ]

Tandy 128K Color Computer 3 (26-3334)

by billdeg - 03/02/2013
Total messages in this thread: 2
Last Post: [ Useful Commands Tandy CoCo ] 03/03/2013
The Tandy 128K Color Computer 3 system with Disk Extended Color BASIC 2.1 boot screen. Also pictured is a dual PERCOM double-density disk drives, manuals and Deluxe Joystick . Click for larger view.
The Tandy 128K Color Computer 3 model 26-3334. Click for larger view.
[ read more ]

Wired Magazine Feature

by billdeg - 02/27/2013
Total messages in this thread: 1
http://www.wired.com/wir...ions-2/?pid=589 Some of my photos were credited in this article.... [ read more ]

Commodore Colt Model PC10C

by billdeg - 02/26/2013
Total messages in this thread: 1
The Commodore COLT PC10C was an 8088 processor XT-clone. The system works but the power supply has a bad line filter cap which needs to be replaced. The system was tested using a Commodore 1950 monitor. The 360K drives work, I cannot locate the Commodore DOS disks. More Photos... [ read more ]

CBM B-520 (a.k.a B256-80 or B500 256)

by billdeg - 02/26/2013
Total messages in this thread: 1
Commodore B500 with 256 K RAM - B520
Pictured are the ROMS from the low-profile B500 (a.k.a "B520" or B256-80). Commodore Labs experimented with a 256K RAM version of the B500 computer, but this version was never sold due to heat or power problems depending on who you talk to about it. Click image for larger area view.
For more information about Commodore B Series computers including the B520 prototype, click here. New Photos... [ read more ]

IMSAI 8080 Processor Tech CUTER

by billdeg - 02/19/2013
Total messages in this thread: 1
IMSAI 8080 running Processor Technology CUTER
Pictured is the original IMSAI 8080 system that I first started working on in 2005. Since then the original Processor Technology General Purpose Module (GPM) card had failed. I was able to find a new one finally, and restored the system to full function again. Click for larger view.
IMSAI 8080 running Processor Technology CUTER
Here is a screen shot of the top of memory. Click for larger view.
New Pics (dated 2013). Note that the original photos' file dates of 2008 are wrong,... [ read more ]

Micropolis 10xx Drive Inventory

by billdeg - 02/19/2013
Total messages in this thread: 1
Micropolis 1022 1033 1053
View of Micropolis disk drives in storage. Left to right: Models 1042 (2), 1022 (2), 1033, 1053 (with spare drive). Click for larger image.
Key pages from Micropolis 10xx manual: Model Versions Page 1-2 Model Versions Page 1-3 Standard Terminal Configurations Note that drives with the blue drive actuator (door) are "Mod II" and 100 TPI, the black lever indicates Mod I which is 48 TPI. More new photos... [ read more ]

Using an ASR 33 Teletype with IBM PC

by billdeg - 06/14/2011
Total messages in this thread: 4
Last Post: [ IBM Async Card Current Loop Jumper ] 02/19/2013
There is a socketed shunt module on the bottom right of the original IBM async board, just pull it out and re-insert upside down (so the dot is pointing down) for current loop. If you're going to use slot 8 of an IBM PC or XT a jumper is required on connector J13. Why I don't know off-hand. Plug a regular-old EIA connector into the serial card in the back. The serial connector pins you need to connect to the teletype are are: pin 9 = + transmit current loop data pin 11 = - transmit current loop data pin 18 = + receive current loop data pin 25 = - receive current loop data [pin 25 is the bottom right (bottom = row of 12 pins)] Then connect to ASR 33: Transmitted data return (-) attaches to terminal strip screw 6 or "number 2 connector" #7 Received data return (-) attaches to terminal strip screw 3 or num 2 connector #5 Transmitted data send (+... [ read more ]

Compaq OEM MS OS/2 1.10

by billdeg - 12/15/2011
Total messages in this thread: 3
Last Post: [ Compaq Deskpro 386s 1.2Mb Drive ] 01/30/2013
The complete Microsoft OS/2 1.10 rev B disks for Compaq.
I am working to recover the 2nd install disk...unfortunately one cannot simply copy the IBM equivalent version, there is a hidden marker file that needs to be changed with a HEX editor before it'll be accepted as a correct disk by the install process.... [ read more ]

Commodore Disk Archive Project

by billdeg - 07/19/2007
Total messages in this thread: 5
Last Post: [ 8050 Disk Archive .D80 format ] 01/28/2013
Here are directions for using the MMC64 with RR-Net to make backups of Commodore 64/128 disk libary. See below for a link to get most of the files you'll need. NOTE: You will need to turn the C64 off and on after each successful image extraction. I am looking for a way to avoid this, so far nothing I have tried works. For this reason, it might be best to use a C128 because you have the reset button. 1. Purchase a MMC64 and RR-Net from http://protovision-online.de (In Germany). The MMC64 fits into the cartridge slot of the C64 (or 128). The RR-Net attaches to the MMC64. It has an ethernet jack. 2. Format a SD-memory card, FAT 16 or 32. 3. Download "Warp Copy." The software contains 2 components. One is WARPCOPY06.prg which is to be run on the Commodore c64. The other component is warpcopy.exe which is to be run on a modern Windows PC. Together they work to per... [ read more ]
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