Latest Projects:
California Computer Systems Series 2200 |
Compaq Contura 4/25cby billdeg Total messages in this thread: 1  The Compaq Contura 425c. Note that the pointing device for this laptop was a detachable trackball mouse, which allowed for a larger keyboard. There is a spring that is used to clamp the trackball to the side of the keyboard on the side front.
The Compaq Contura 4/25c is a 486 laptop that I used to support when I worked at Zeneca in the early 1990's. The Contura was a lighter-weight Compaq laptop of the early 1990s. I received this computer with Windows 95 installed, but it would have come with Windows 3.1. I tested the modem and it worked. The battery needs to be replaced, it would not hold a charge.
Pictures">... [ read more ]
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RetroChallenge 2009 - Apple II Biorhythmby billdeg Total messages in this thread: 3 Updated: [ And the Winner Is... ] 02/08/2009 I signed up for the 2009 RetroChallenge http://r.../winter/news.html  Apple II with Apple disk drives and Sony Trinitron color television. Note Biorhythm program running on display. Click thumbnail for larger image.
THE PROJECT:
Write a Y2K-compliant Biorhythm program on and for the original Apple II computer, using a vintage color TV.
Here is the Biorhythm video:
http://www.youtu...tch?v=jYoY1cwAd90
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PRESS PLAY ON TAPE: Retro Actionby billdeg Total messages in this thread: 1 http://www.youtube.com/w...v=aoQa1OiHlrM chicks and vintage computers.">... [ read more ] |
MITS Software Agreement |
Lanier Word Processor Model 103by billdeg Total messages in this thread: 3 Updated: [ possible trade ] 05/23/2010  The Lanier Model 103 Word Processor / Computer
The University of Delaware received a Lanier Model 103 Word Processor / Computer as a donation. As you can see it's in pretty bad shape, but it may be at least partially restorable. I have not done much with it, other than open it up for a visual inspection. There's an 8080 processor on the disk drive control board.
More pictures">... [ read more ]
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Malvern Particle Sizer - CBM 8296 OEMby billdeg Total messages in this thread: 2 Updated: [ PLA Replacement Malvern CBM 8296 ] 01/11/2009 I have re-started the restoration of the Malvern "Particle Sizer" a CBM 8296 OEM unit from an earlier thread. This is no normal 8296, it looks more like a squashed 8032. In addition to the strangeness of the chassis (compared with the normal 8296), this computer has a daughter board for Co-ax communications and/or particle sizing? with an end port similar to an IBM PC. The true origins of this OEM system is proven by the 8296 label, motherboard part number 324645, and a single internal SFD-1001 drive. Note that since some of these pictures were taken a few years ago I have fixed up some of the dangling bits. Ignore the file date">... [ read more ] |
S-100 board testing with Z-80 ICEby billdeg Total messages in this thread: 4 Updated: [ ICE and RAM may vary in compatibility ] 01/09/2009 I just finished testing a Cromemco 64KZ RAM board. I did this by using Bob Grieb's Z80 ICE, which is made to be plugged into the Z80 slot of computer or controller card. Bob created his own "PIC-based circuit that could emulate a Z80 for displaying memory, writing to I/O ports, etc. as an aid to troubleshooting..." Bob's modern version is based on the Nicolet Paratronics Z80 emulator called the Z80 NICE. I am fortunate to have been given a beta version of this device to test. I inserted his Z80 ICE into a Jade CPU card, which is installed in my California Computer Systems 2200 Series S-100 computer. Using the ICE I was able to determine that the JADE controller was working correctly. Next I tested 2 64K RAM cards a Cromemco 64KZ and a SMS 64K. The SMS was 100% OK, but not the Cromemco. H">... [ read more ] |
Northstar Horizon - Boot Problemby billdeg Total messages in this thread: 11 Updated: [ N* back in business ] 01/04/2009 First the situation and then the questions My formerly working Northstar Horizon will no longer boot formerly known-to-work boot disks. This system used to boot up a number of NS disks, worked very well with present hardware. Not sure what happened. I did all of the standard stuff with chips and connections, but I did not do any electrical probing or anything like that. Now, when the system is powered on the drive does not engage the disk. It spins for a spell and then stops. Both the A and B drives will spin together upon boot for 30 seconds and then stop. The left / boot drive is a Tandon TM100-2A with all the jumpers off. The right drive is a MPI model 52 with the first two jumpers on. I have temporarily disconnected this drive. I have a terminator jumper installed on drive A. I have a North Star MDS AD3 controller/interface card with no visible modifications. I tr">... [ read more ] |
Lear Siegler ADM 3Aby billdeg Total messages in this thread: 2 Updated: [ ADM3 Working (always has been) ] 12/19/2008 Restoration project notes for Lear Siegler ADM 3A terminal S/N 21818 from late 1977. The bad news: I cannot communicate with a known-working computer, no response from keyboard although box prompt is present. The good news: The picture is in good shape. I cannot get the computer to respond locally either. I tried to jumper pins 2 and 3 (I believe those are the ones). Missing the dip switch cover. Updates to come. Pictures ADM3A">... [ read more ] |
C64 for saleby dmobile215 Total messages in this thread: 1 Keyboard,Floppy Disk Drive (1541) Tape Drive Software 5.25 Fast Hackem Word Processor 64 Gemini Printer included! Make me an offer! ">... [ read more ] |
Xerox 820-IIby billdeg Total messages in this thread: 1 Coming soon thread about Xerox 820-II project to add a 5 1/4" drive to an already-working system with 8" drives. I have received a lot of disks to archive. Pictures">... [ read more ] |
Altair BASIC on cassetteby billdeg Total messages in this thread: 2 Updated: [ WTB Altair Tapes ] 11/26/2008 I bought some "Altair tapes" on Ebay. When the box arrived, I opened it to find that it contained most if not all of the Altair BASIC versions. More to come.">... [ read more ] |
New Picturesby billdeg Total messages in this thread: 1  Timex 1000 / Sinclair ZX 81 Books and Manuals My policy for collecting computer artifacts is to keep only working or serviceable systems and parts. I also avoid anything that I have no intention in actually using. Lastly, I have a finite space so for everything that comes in, something of lesser interest must go... Miscellaneous Grid Laptops Xerox 820-II Misc Micropolis Drives ICOM Dual 8" Drive Two IMSAI 8080's 
IBM Software Pkgs
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Archiving Apple II disksby billdeg Total messages in this thread: 2 Updated: [ Apple IIGS 3.6v MB Battery ] 11/28/2008 Test subject: Apple II GS with 3.5 and 5 1/4" drives, ADT 1.21 and a bunch of diskettes. 
Apple II GS Computer running ADT 1.21 I decided it was time to learn how to archive Apple II disks by copying them (somehow) to a modern computer. I chose an Apple II GS as the bridge system because it has a 3.5 and 5 1/4" disk drive, and it can read old Apple II diskettes. The question is how to take make disk images and save them to 3.5 disk, and then find a modern system to read the 3.5 disks. Finally I will need to be able to both run the disk images in an Apple II emulator, and also move disk images from other sources to the Apple II GS for extraction onto 5 1/4" in Apple DOS 3.3 format for use on an Apple II (II-->IIe). [1 archive diske">... [ read more ] |
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Total messages in this thread: 5
Updated: [ Bootstrap Loader DJ/DMA ] 02/11/2009