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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 ]

PET 4016 to 4096 Project (+64K RAM)

by billdeg - 10/25/2009
Total messages in this thread: 3
Last Post: [ PETVet ] 01/22/2013
I finally got around to attempting to install a CBM PET 4032 mother board in my 4016 PET.
The Commodore PET 4016-12 Computer.
The 4016 motherboard can be upgraded with the 4032 (32K RAM version) in a matter of minutes. Aside from doubling the RAM (16K --> 32K) the boards are exactly the same, and so is the power supply. Why go through the effort of getting a paltry 32 more K out of the system? My ultimate goal is to turn my 4016 into a "PET 4096" and only the 4032 is compatible with the 64K memory expansion board. I don't have a 4032 anyway, *and* it's easier to change the "1" to a "9" on the case if I was to somehow change the front label. Here is a link to the PET 4032 mother board. Note the top line of RAM chips and then compare with this... [ read more ]

DSD 880 Control Panel

by billdeg - 06/23/2010
Total messages in this thread: 4
Last Post: [ U of Delaware VAX Photos ] 01/12/2013
Pictured is a control panel for a DSD 880 which is a plug-compatible RX02/RL02 emulator for PDP8/PDP11 minicomputers. I think that this particular PDP 11 also ran a "FuzzBall" router controller designed by Professor Dave Mills of the University of Delaware. The Fuzzball was the router selected for use in launching the National Science Foundation Network (NSFNET) in 1985, the direct ancestor to the commercial Internet (WWW). Click on image for larger views.
In the early 1980's MILNET was spun-off of ARPANET. Soon afterwords the National Science Foundation launched the NSFNET service on the now non-classified ARPANET system, in 1984-85. NSFNET used the ARPANET TCP/IP standard. NSFNET went commercial in the early... [ read more ]

Employment Opportunity - MIT

by billdeg - 01/09/2013
Total messages in this thread: 1
1965 ad for employment with MIT in Project MAC. Sounds interesting...
... [ read more ]

Texas Instruments Compact Computer 40

by billdeg - 01/09/2013
Total messages in this thread: 1
Texas Instruments Compact Computer 40
A close-up of the 1983 Texas Instruments Compact Computer 40, also known as the CC-40. After cleaning the battery holder and installing new 4 AA batteries, this unit fired up and was fully functional. Click image for larger view.
Texas Instruments Compact Computer 40
The TI CC-40 is a typical first-generation laptop similar to the Tandy TRS 80 model 100. Out of the box the CC-40 is capable of creating and running BASIC programs, calculator functions, and support add-on cartridges for more specialized functions. The display is a single line 40-character LCD. Click image for larger view.
... [ read more ]

Mystery Logic Boards from 1968 or 1969

by billdeg - 01/03/2013
Total messages in this thread: 1
Pictured is a pair of computer logic boards from 1968 or 1969. The part numbers (?) printed on the boards are 438811-1 and 438803-1B. Can you identify the manufacturer of these boards? These boards are exactly 14 cm (not including the handles), they're larger than similar boards from Digital Equipment Corporation. The Click image for larger view.
ID labels RA 240-2 and DR 240 are silk-screened on the thumb handles. Click image for larger view.
[ read more ]

OSI Peek[65] vol 4.8 and 4.12 available

by billdeg - 12/22/2012
Total messages in this thread: 1
Cover of Ohio Scientific computer-themed newsletter PEEK[65] volume 4 number 8 from August 1983. Scans of these two issues are now available for download
Vol 4.8 (Aug 1983) Vol 4.12 (Dec 1983)... [ read more ]

MITS 88-2 SIO (2SIO) for BASIC

by billdeg - 02/10/2010
Total messages in this thread: 6
Last Post: [ IMSAI and 2SIO - Loads 4K BASIC ] 12/15/2012
Click image for detailed pictures of jumpers.
... [ read more ]

Teletype ASR 33 S/N 256219 Repair

by billdeg - 06/04/2012
Total messages in this thread: 4
Last Post: [ Restoration Complete ] 11/29/2012
The keyboard of the Teletype Model ASR 33. The cover of the teletype has been removed.
I have been working to restore teletypes lately. I am almost done with this one, in fact it was running just fine until I read in a long tape using the reader. Afterwards I noticed that the characters that use the 6th channel/cam to print characters from the keyboard was being switched with channel/cam 7. For example, if you hit the "4" key, the printer prints a T instead. The Model 33 typewheel code chart says that the 4 is printed using channel 3-5-6-8. A "T" is printed by using channels 3-5-7-8. I have asked Wayne from the GreenKeys mailing list for help. He has a teletype repair and restoration business and I highly recommend his services. Closeup p... [ read more ]

Tandon 100-2A alignment w/o align disk

by billdeg - 11/28/2012
Total messages in this thread: 1
Originally posted on TRS 80 Yahoo group, will work on any Tandon 100-2A "..article by Philip Avery ... He used a TRS80 M3 to undertake radial alignment on Tandon drives with a scope, but without an alignment disk. http://www.clas...andon-m100.htm Terry (tez).."... [ read more ]
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