Latest Projects:
CBM KIM-1 Rev G Restoration |
Motorola MEK6800D2 Microcomputerby billdeg Total messages in this thread: 3 Updated: [ 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 Boardby billdeg 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 ]
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RCA COSMAC Microkitby billdeg Total messages in this thread: 12 Updated: [ RCA 1800 Family Oral History Panel ] 12/21/2018  The 1974 RCA COSMAC Microkit. This is the first commercial microcomputer from RCA to contain the two-chip COSMAC microprocessor (TC 1084 / TC 1085 version). The processor was developed in New Jersey, but the kit itself came out of the RCA Palm Beach Division. Click image for larger view.
 Note the TC 1085 chip on the processor card, which is the earlier name for the CDP 1801 and has a silk screen date of late 1974. Click image for larger view.
Compare the above processor c">... [ read more ]
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Intersil 6100 PDP 8 Homebrew Systemby billdeg 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 ]
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Trenton Computer Festival 2013by billdeg Total messages in this thread: 1  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.
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Tandy 128K Color Computer 3 (26-3334)by billdeg Total messages in this thread: 2 Updated: [ 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.
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Wired Magazine Featureby billdeg 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 PC10Cby billdeg
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 ]
Total messages in this thread: 1  |
CBM B-520 (a.k.a B256-80 or B500 256)by billdeg Total messages in this thread: 1  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 ]
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IMSAI 8080 Processor Tech CUTERby billdeg Total messages in this thread: 1  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.
 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 ]
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Micropolis 10xx Drive Inventoryby billdeg Total messages in this thread: 1  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 ]
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Using an ASR 33 Teletype with IBM PCby billdeg Total messages in this thread: 4 Updated: [ 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 1.10by billdeg Total messages in this thread: 3 Updated: [ 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 ]
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Commodore Disk Archive Projectby billdeg Total messages in this thread: 5 Updated: [ 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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Total messages in this thread: 4
Updated: [ Photos Commodore KIM-1 Rev G ] 08/27/2014