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Multi-Tech Systems MT25 EIA-CCITT

by billdeg - 09/01/2009
Total messages in this thread: 1
Multi-Tech Systems MT25 EIA-CCITT Breakout / Monitor tester. A useful tool.
... [ read more ]

Qume QVT-108

by billdeg - 09/01/2009
Total messages in this thread: 1
The Qume QVT-108 terminal appears to be 9600 baud terminal. This terminal came with a CompuPro 8086/8085 system and was probably used as the console.
A few more pictures... [ read more ]

Zorba GC-200 Portable

by billdeg - 09/01/2009
Total messages in this thread: 3
Last Post: [ Zorba Repairs ] 07/20/2011
I have received a non-functional Zorba portable model GC-200. It's in nice cosmetic shape, but does not complete a boot cycle, no screen output, no attempt to access diskette. The portables of this era all seem to have similar problems.
The portable with the quirky name - Zorba - was one of the last great CRT portables. This portable had dual 5 1/4" drives and ran a CP/M. It had non standard looking 25 pin female serial, parallel and IEEE

Shugart SA801 Inventory

by billdeg - 08/30/2009
Total messages in this thread: 1
Shugart 801 inventory 5 Shugart 801's, none have yet been proven to work. Enclosures: Lobo twin 8" drive enclosure. Xerox twin 8" drive enclosure SN: x973 013718 New Old Stock drive in box. M35982 3/15/1982 NOTES 1. Removed boot drive from Lobo enclosure and replaced with the new old stock drive. made jumper changes to match original drive 2. Xerox drives not used #1 #2 ... [ read more ]

Vintage Computer Festival Video 2008

by billdeg - 08/26/2009
Total messages in this thread: 1
Demo of Space War on the PDP 8i captured on video, with ASR 33 and Calcomp Plotter: http://www.y...=JxVMtGFcc_s Towards the end there are a few snips of my exhibit from the festival as well. Here is a video of my Commodore SuperPet and D9090 from Dan Roganti: http://www.y...Mw0UEHoxU ...another one from Dan of the ENIAC development lecture [ read more ]

Timex Sinclair 1000 / ZX81

by billdeg - 07/11/2007
Total messages in this thread: 3
Last Post: [ Looking for Sinclair Keyboard ] 08/23/2009
Here are some photos of some recently purchased Timex Sinclair 1000 / ZX81 items. There are 6 boxes of books and hardware, plus about 150 tape programs to catalog. Assembly programming for the Sinclair I can believe..Forth? I had no idea how seriously people took these machines. more to follow. I will probably put some of this up for sale, if anyone is interested, let me know. My favorite item is the Suntronics Sinclair keyboard kit. Makes the system so much more usable with a good keyboard. ... [ read more ]

Geniac Ad

by billdeg - 08/07/2009
Total messages in this thread: 1
Astounding SCIENCE FICTION page 1 Advertisement:
This is an ad for the 1958 model of the Geniac computer kit. PDF
... [ read more ]

MARCH's 2 PDP 11/05 computers

by billdeg - 08/02/2009
Total messages in this thread: 1
On my way home from MARCH's computer museum I took home two 11/05's for inspection. More on this later, but I was able to get one of them to read and write memory from the front panel, the other I was also able to get funcitonal aside from a stuck 7th bit in the 4K Core memory card. UPDATE: THe system with the bad core does not respond to any front panel input, the "working" system today would not power off when switching the key to the off position.... [ read more ]

SWTPc TV Typewriter II

by billdeg - 07/29/2009
Total messages in this thread: 2
Last Post: [ TV Typewriter II Restoration Update ] 08/08/2009
The original TV Typewriter on display in the MARCH museum was donated by Bill Dudley. I don't have any pictures at the moment. Bill showed up on Wednesday and we took the thing apart to see if it could be made functional again. Here are some project notes for future reference, I will come back to this post asap. 1. The keyboard attached to the unit is a George Risk. See same keyboard model I have the tech doc for the keyboard, but this was not necessary, all of the voltages checked out OK. The keyboard voltages and connections are good. We checked the repeat key mod Bill had made. We monitored the voltage coming into the TV Typerwriter from the keyboard. Each time a key was pressed, the voltage jumped 15 millivolts (from 80 to 95). We did not go so far as to verify that when you press an "a" you get an "a" sent by the ke... [ read more ]

IBM PC Convertible 5140 Laptop

by billdeg - 12/07/2008
Total messages in this thread: 3
Last Post: [ 5140 Guide to Operations? ] 07/10/2009

What make these IBM laptops tick, anyway? Recently I have been learning more about what you can and can't do with an IBM 5140 laptop. It's a non-PS/2 from 1986 that was popular until the PS/2 laptops started appearing a few years later. Surprisingly, a lot of the units I have come across still have working batteries! I need more power supplies. Pictures of 5140's... [ read more ]

Commodore P500 (aka C128-40)

by billdeg - 07/04/2009
Total messages in this thread: 2
Last Post: [ CBM P500 PAL to NTSC Conversion ] 07/11/2009
The Commodore P-500 was the first to have a SID chip installed.
The boot screen from a PAL Commodore P500 using an NTSC monitor.
I have to use a step up/step down transformer because this is a 220 / PAL system. After carefully testing the AC input and DC power output I determined that the power supply was correctly sending 12V, -12V, 2.5V, and 5V. There is a TIP29 transistor that seemed to be sending the correct voltages, based on the data sheet. I swapped the English PAL VIC-II chip with a VIC-II from a C-64. The black and white screen above is exactly what you'd expect to see coming from an NTSC monitor when receiving the PAL refresh rate. More Pictures I found this set of instructions on [ read more ]

Commodore Models - 10 have SID chips

by billdeg - 07/04/2009
Total messages in this thread: 1
The following 10 American Commodore computers models with at least one unit sold in stores and also had SID chips are:
The Commodore P500, also known as the C128-40 was the first Commodore model with a SID chip.
P500 C64 SX64 C64C C128 C128D B500 CBM 128-80 CBM 256-80 B128 Honorable Mention, but not sold in stores: C64 LCD ... [ read more ]

A donation story

by billdeg - 03/22/2008
Total messages in this thread: 3
Last Post: [ Archiving Wafers to WAV ] 07/02/2009
As you may or may not know last year my VCF exhibit was supposed to be on the Exatron Stringy Floppy. A month before the show all my drive's belts snapped, and I had to switch my exhibit to a different subject. And that's why I did the TRS 80 Model 1 30th anniversary exhibit. Not my first choice, but that's the way it goes. hoo haa. Since then I found a company to engineer replacement belts. It took 4 belt size/width attempts to finally get it right. Great, 6 months late but I finally had a working drive. I given the parts and such I accumulated I was able to assemble 3 working drives and I was able to use the belt for another related project that uses the same motor/belt. It pays to stick with things. "A donation story" Around lunchtime Friday I was working down stairs at my office in Wilmington, on the IBM Series 1 friends helped me move around Christmas time. The... [ read more ]

Panasonic Senior Partner

by billdeg - 07/02/2009
Total messages in this thread: 1
The Panasonic Senior Partner is an attractive IBM clone portable with a built-in printer.
The Panasonic Senior Partner running DOS 2.1
I built a boot disk to be stored with it, and I guess it was a DOS 2.1 machine but I don't have the manuals and such. More pictures... [ read more ]

The lost NASA tapes

by billdeg - 07/01/2009
Total messages in this thread: 1
This is an article that illustrates the importance of preserving the skills needed to preserve ancient data from being lost. From Computerworld online: The lost NASA tapes: Restoring lunar images after 40 years in the vault A Mac Pro and 40-year-old tape drives are helping restore the original Lunar Orbiter tapes http://www.comp...12&pageNumber=1 Here are some pictures from an actual Apollo lander computer, courtesy Frank O'Brien from VCF East 3 2006. Apollo Guidence Modules Apollo Guidence Module Closeup 1 Apollo Guidence Module Closeup 2... [ read more ]
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