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1993 Digital DECpc XL 566

by billdeg - 11/24/2014
Total messages in this thread: 1
Digital DECpc XL 566
In November 1993 Digital Equipment Corp introduced its XL line of PC computers which included two Pentium I CPU PCs, the DECpc XL 560 and 566. The price for the model shown here was $4,399. Click image for larger view.
This particular machine works quite well and is very clean. I plan to set it up as a vintage 1995 web designer PC, with my original programs and files from that era. This one has an ethernet card in it, which is kind of cheating, the average designer in 1995 would have had a 33.6 kbaud modem. On the other hand if you could afford $4000+ for a PC in 1995 you might was well throw in an Ethernet card as well, eh? Photos... [ read more ]

CBM BX700 Pictures

by billdeg - 11/18/2014
Total messages in this thread: 1
Commodore BX700
CBM BX700 with chassis propped open. Click image for larger view.
CBM 8088 B Series Math Co-Processor
View of the 8088 co-processor board used to boot MS DOS and CP/M 86 OS. Click image for larger view.
A few new photos of the rare Commodore "BX700", a B-Series prototype with no ID badge or S/N label. The BX700 is not to be confused with the European B700 / American CBM B128-80.... [ read more ]

Mainframe / MiniComputer User Manuals

by billdeg - 11/18/2014
Total messages in this thread: 1
Mainframe and Minicomputer paper documents
Here is a snapshot photo of my basement floor sorting project, everything is being cataloged and sorted by manufacturer and model. I will eventually catalog all of this and post here...Click image for larger view.
More photos... [ read more ]


by billdeg - 03/18/2007
Total messages in this thread: 5
Last Post: [ UNIVAC 1219 / 418 Models ] 11/13/2014
Here is a link to the "Univac 1219 Military Computer General Description" brochre: Hi-res Images... [ read more ]

SuperPET ComboBoard Revisions

by billdeg - 11/05/2014
Total messages in this thread: 2
Last Post: [ SuperPet U47 - not a 2764 ] 11/09/2014
I have a SuperPET ComboBoard with a bad 970018-12 (slot U47)...I assume there is no source for the original ROMS...From what I found on the web, this is just a 2764. I will try to make a copy of the one good ROM. I found this site http://mhv.bplaced...s/cbmroms.php SuperPET Waterloo $A and $B (U47) A000 - BFFF Anyway, soon I will see how it goes to make a replacement ROM from scratch. Regarding the two spare Combo boards I have on hand; one is an original Combo board, and one a "Rev D". Both boards are good other than the one bad ROM that I have to share between the two. I did not realize there was more than one rev of the SuperPet Combo board. The big difference is that J2 (the switch port) is in a different positi... [ read more ]

Using CBM 4040 and SuperPET in 6809 Mode

by billdeg - 10/31/2014
Total messages in this thread: 1
CBM SuperPET Switch Settings for 6809 Mode
This is a view of the CBM SuperPET switch settings for 6809 mode. In this position one can run the Waterloo development languages including Pascal, COBOL, Fortran, BASIC, and Assembler. Click image for larger view.
The topic of conversation came up as to whether one could run the SuperPET Waterloo software from a 4040 drive. Being that the 4040 is the IEEE dual-drive equivalent of the 1541 drive, it would then be possible copy the disk as a D64 for easier transport and poss use on an actual serial drive with an adapter. [ read more ]

Tandy 1000 Series MS DOS Computers

by billdeg - 10/23/2014
Total messages in this thread: 1
Tandy 1000 SX 25-1052B
Tandy 1000 SX 25-1052B. This unit has a 10 Mb hard drive and single 360K diskette. Click image to see additional photos of this model.
Tandy 1000 HX 256K
Tandy 1000 HX base model with one 720K disk drive and 256K RAM. Click image to see additional photos of the 1000 HX model
Tandy 1000 HX 640K
This is an upgraded 640K 1000 HX with two 720K disk drives. Click image to see larger view.
[ read more ]

AT&T UNIX PC 3B1 vs. 7300

by billdeg - 06/28/2008
Total messages in this thread: 5
Last Post: [ Using an External Terminal ] 10/12/2014
I received some AT&T UNIX PC parts this week from Mike Lee ( ) Specifically he sent me most of a UNIX PC "7300" model. I own a dead "3B1" model, which can be differentiated from the 7300 by it's raised monitor. I could not find any 3B1 images on the web, below is a link to my system's pics. There are plenty of the 7300's on the web. Anyway, I started into diagnosing what was wrong with my system, and his too. I was hoping to be able to merge my dead system with the parts from Mike's and create a working system. Almost... It turns out that the later model of the UNIX PC, the 3B1, has a different power supply than the older 7300 variants. Mike sent me a "middle version" 7300 with 1 MB onboard RAM. He sent me two good power supplies. Unfortunately neither will work on the 3B1, not the same juice. I checked with volt meter, compared with interne... [ read more ]

Mattel Electronics Auto Race

by billdeg - 10/07/2014
Total messages in this thread: 1
First Handheld Electronic Game, the 1976 Mattel Electronics Auto Race.
I was playing around with this game and gave it to my kids to mess around with. They were mildly interested, but did not really get it. So much for the first entirely digital handheld electronic game. One had to shift into high gear while the car (represented by a LED light) was at the bottom of the track and steer clear of the on-coming cars (more LED lights). As the player's car makes its way up the track there is less time to react to on-coming cars. To compensate the player downshifts using the GEAR controls to slow the pace of cars. Once back at the bottom of the screen the driver can shift back into a higher gear. The lower the score the better, and the worst score is 99. 512 bytes of program storage (not 512K). The Auto... [ read more ]

TRS 80 Model III SN 0019671

by billdeg - 09/19/2014
Total messages in this thread: 1
TRS-80 Model III Serial Number 0019671
TRS-80 Model III Model 26-1066 with Serial Number 0019671. This unit had two drives with broken drive door latches. From the view of the inside, looks like this machine had little actual use. Click image for larger view.
More Photos Tandy replaced the early Texas Peripheral drive latches with a better mechanism, but given the drives did not test/perform well, I decided to not to waste good replacement latches on them. Instead I replaced both drives. Both are practically brand new, There is a note with the machine that says the original power supply was replaced in early 2000's. Not sure if you can tell from my last bat... [ read more ]

TRS 80 Model III Exatron Stringy Floppy

by billdeg - 09/06/2014
Total messages in this thread: 2
Last Post: [ ESF Version 4.1 and hardware photos ] 09/17/2014
TRS 80 Model III Exatron Stringy Floppy
TRS 80 Model III Exatron Stringy Floppy, front panel. Click on image for larger view.
TRS 80 Model III Exatron Stringy Floppy Initialization
THe Model III Exatron Stringy Floppy is not compatible with the Model 1 version because the model III reserves the memory location the model 1 version needs. For whatever reason, Exatron required that the model III version boot from a wafer. Most wafers have turned to powder at this point so I dare not mess around... [ read more ]

Semi-Virtual Diskette (SVD)

by billdeg - 09/12/2014
Total messages in this thread: 1
Semi-Virtual Diskette (SVD)
Version 2.4 of the Semi-Virtual Diskette (SVD) was created by a classic computing hobbyist named Eric and could be used on TRS 80 models, Apple II, TI 99/4a, and Heathkit computers to extend a modern PC serial port to emulate a diskette drive. Click image for larger view.
This particular unit had a blown power supply and 7805 voltage regulator when I got it. Fixed. A nice addition for re-creating archived diskettes to the machine in order to build new diskettes. I don't think that Eric still builds or supports this product anymore. Not sure how many were produced. Website address for support and software: [ read more ]

Hand-held Calculators and Computerettes

by billdeg - 09/01/2014
Total messages in this thread: 1
Toshiba LC-836LM
The 1978 Toshiba LC-836MN is considered by many authors to be the first hand-held personal assistant / databank, a computer-ish calculator. Click image to view more photos.
I have uploaded new photos into the following directories, most are small handheld calculators with computing abilities, a few games and odds and ends. These are not new to me things but I had been meaning to upload images for some of these for years. more than half of these are from the E Koblentz collection. Each has been tested and cataloged, batteries removed when present. I almost always have at least one handheld computer on my desk to use for day to day use. AST Newton [ read more ]

Teletype as Program Storage for Kim 1

by billdeg - 08/28/2014
Total messages in this thread: 2
Last Post: [ 470 ohm resistor ?? ] 08/28/2014
Per I am working to set up my KIM to a teletype (not using rs232) using current loop/papertape old school. I have mine wired up now, but have not actually powered on to test. I have what I think is right, but first I want to do more research.... I think it's: application pin T --> Teletype terminal strip connector 6, "what KIM schematic calls the keyboard" U --> 3 "KIM schematic calls the printer" R --> 7 "KIM keyboard return" S --> 4 "printer return" I am basing this on PDP 11 and PDP 8 documentation where (and this works) "transmitted data -" goes to terminal strip connector 6 "transmitted data +" connects to TS 7 "received data -" to TS 3 "received data +" to TS 4 SO, I guess I am wondering if: "printer" in the KIM docs is the same thing as "received data -" in the DEC pdp docs "keyboard" in KIM docs is the same thing as... [ read more ]

Rockwell KIM-1 Rev D

by billdeg - 08/23/2014
Total messages in this thread: 5
Last Post: [ Rockwell KIM-1 Rev D Photos ] 08/27/2014
Rockwell KIM-1 Rev D
Rockwell, MOS or CBM Kim-1? It's a rev D that should be Commodore, but the brand is obscured by a metal plate. There is no date stamp above the serial number that I have seen in another rev D. Perhaps this is one of the KIM-1's from the transition between MOS and Commodore. Or maybe a Rockwell or other OEM Kim-1. But did Rockwell sell rev D's? The date codes of the chips are mostly early 1977, some late 1976 and the layout is the same as other KIMs that I have seen. Note the serial number is PA2079. This same pattern was used by Commodore in later revisions. PA most likely indicates Norristown, Pennsylvania, USA. Click image for larger view.
Here is another rev D, but it does not look much like mine: ... [ read more ]
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