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MITS 8800b Turnmon 9600 baud

by billdeg - 09/15/2013
Total messages in this thread: 6
Last Post: [ Load BASIC into ROMS ] 08/09/2015
Pertec MITS altair 8800b Turnkey model key view.
A view of the on/off key on the Pertec / MITS 8800b Turnkey model. The system required some minor repairs, a short was detected in the turnmon board preventing I/O from the Turnmon board. I repaired some burned out traces and set the baud rate to 9600.
Pertec / MITS Altair 8800b Turnkey model 9600 baud jumpers
View of a repaired turnkey "turnmon" board. Note S0, S1, and S2 are jumpered to produce 9600 baud. S0 required minor repair, some of the original trace metal was lost. The staining is only cosmetic. Click image for larger vie... [ read more ]

Friden Model 132 Electronic Calculator

by billdeg - 12/17/2009
Total messages in this thread: 3
Last Post: [ repair complete ] 07/27/2015
The 1965 Friden 132 Electronic Calculator was the first electronic calculator capable of doing square root.
The 4 row display of the Friden 132.
More pictures ... [ read more ]

PDP 11/40 Power Supply Issue!

by billdeg - 08/12/2008
Total messages in this thread: 14
Last Post: [ Basic stress testing ] 07/17/2015
Nooo! The console and power supply light flicked out while in use. WTD: Power Supply or Power Supply Module. The part number on the front is "H742a" and it's the big part of the power supply in the back. In front (looking from the side) are power modules. The modules and the console power are attached to the "H742a" Other H74x supplies should work. Here is the wording on the unit: Dec Power Supply H742a Caution AC & DC OUTPUTS ARE PRESENT WHEN LIGHT IS ON POWER ON (( )) ------------ where (( )) = the light bulb. The supply's red indicator light no longer comes on, nor do the console lights, though the fans still run. In the meantime I will test with a volt meter and so on, maybe there's a bad connection. More to follow.... [ read more ]

1972 DEC idacs 11/07 Industrial PDP 11

by billdeg - 07/14/2015
Total messages in this thread: 1
Digital Equipment Corporation idacs 11/07 industrial PDP 11 computer
The circa 1972 Digital Equipment Corporation idacs 11/07 industrial PDP 11 computer. Click for larger view.
Download Sales Brochure... [ read more ]

Xerox 820-II - Set Up

by billdeg - 01/06/2011
Total messages in this thread: 4
Last Post: [ Blew a Power Cap! ] 06/23/2015
The Xerox 820-II Computer with DD 8" and "Rigid" disk option.
Xerox is one of those computer companies, like Apple, whose computers you'd buy partially because of the brand name. At least that was the the case in early 80's. The initial reaction of consumers when the Xerox 820 series was announced was "Ah ha, watch out IBM, Xerox is getting in the game and they'll show everyone how to make a real computer". It did not quite work out that way, the 820 series was pretty boring - no mouse and no hi-res graphics like the Lisa-inspiring Xerox Star, the production version of the Xerox Alto. Instead, the 820-II was a business machine, and as such it wa... [ read more ]

DECpc 433SLC Laptop

by billdeg - 06/16/2015
Total messages in this thread: 1
Digital DECpc 433SLC laptop
The 33Mhz i486 Digital "DECpc 433SLC Premium" laptop model PCP38 - One of the last Digital-branded laptops made before the company was bought by Compaq. The SLC was first made available in February 1994 and would have been designed for Windows 3.11, but would have run Windows 95 as well.
More photos... [ read more ]

1993 Compaq Deskpro 5/60M

by billdeg - 06/16/2015
Total messages in this thread: 2
Last Post: [ Restoration progress ] 06/17/2015
1993 Compaq Deskpro 5/60M Pentium Computer
The unassuming Compaq Deskpro 5/60M computer is considered one of the first commercially-sold desktop computers with an Intel Pentium processor. Click for larger view.
EISA qVGA card
Pictured is a rare Compaq QVGA EISA video card. These were at the time Cadillac VGA cards, a good match for the system. The QVision VGA cards also appeared in AlphaServers. Click for larger view.
[ read more ]

Raspberry Pi as Gateway to Internet

by billdeg - 01/03/2015
Total messages in this thread: 3
Last Post: [ IRSSI IRC slashnet.org #vc ] 06/13/2015
Raspberry Pi as Internet Gateway for Vintage Computers
The Raspberry Pi can be used to connect vintage computers to the internet. This image shows my preference - A USB wireless dongle and a USB to serial cable. One could also use the serial port of the Pi, but that method is not covered here. The operating system I chose is a version of Debian Linux tailored for Apple II use (search the web for "IvanX" to download a copy with directions), but this Pi distro is also good for most other terminal software-driven vintage computers. Click for larger view.
The first thing I attempted was to connect a Digital VT102 terminal to the Raspberry Pi. I used a cabled ethernet conection rather than wireless. I also... [ read more ]

The Digital Ultimate Workstation 533au2

by billdeg - 05/11/2015
Total messages in this thread: 1
The Digital Ultimate Workstation 533au2
The 1998 Digital Ultimate Workstation 533au2 was one of the last Digital-branded mini computers. Click image for larger view.
These machines shipped with either Windows NT® Server 4.0 or DIGITAL UNIX, but many installed OpenVMS as well. As you can see, this machine has OpenVMS 7.3 installed (the latest VMS release version as of this writing). Click for larger view.
Marketing Brochure: http://manx.c...ons/antonio/dec/EC-F869... [ read more ]

Telebyte 65A RS232 Converter

by billdeg - 03/25/2015
Total messages in this thread: 6
Last Post: [ Repairs ] 05/07/2015
MITS Altair 680 cover removed
I modified my Altair 680 for 110b, no Baudout, 1 stop bit (see notes about stop bits below). I tested my work by connecting the Altair to a DEC VT102 terminal. Comms are slow but they work enough to get to the ROM monitor prompt and enter commands. Now I know the system works well enough at 110 baud to continue. Note in the photo next to the Altair is a Multi-Tech Systems MT25 EIA-CCITT Breakout / Monitor tester. This device allows me to see what signals are being sent through the serial cable. Click image for larger view.
Telebyte Model 65A RS232 to Current Loop Conve...<strong> <a href=[ read more ]

MITS 8800b Turnkey Restoration (#3)

by billdeg - 04/25/2015
Total messages in this thread: 3
Last Post: [ Restoration Complete ] 04/30/2015
PCC MITS Altair 8800b turnkey front
Started Pertec / MITS Altair 8800b Turnkey system restore project. After doing an initial power test I disassembled the unit for cleaning. Click image for larger view.
The system itself works pretty well, with 48K RAM. The only functional issue remaining is the front panel. I cannot reset nor start the system using the switches. I removed the front panel card by desoldering the switch posts connected to the rear of the card from the front of the chassis so I could slide the card out. I also desolder... [ read more ]

Vintage Joystick Kit

by billdeg - 04/29/2015
Total messages in this thread: 1
vintage computer joystick game controler
A game controller from the mid 1970's that was built from a kit. Designs for these kits were published in magazines like Radio Electronics and Popular Electronics.
Looking for the source of the kit for this joystick. If you can provide, please contact me. It looks a lot like the Cromemco joystick, but not exactly.... [ read more ]

VCF East 10

by billdeg - 04/25/2015
Total messages in this thread: 1
Dave Gesswein powering up the R.E.S.I.S.T.O.R.S. historic PDP-8 computer for the first time in 40 years. A magnificent restoration achievement.
My pick for best exhibit of the show was Doug Crawford's comprehensive VISICALC, with an impressive display of systems running VISICALC, plus a spreadsheet program he wrote for the RCA ELF.
Mike Loewen's TRS 80 Model 4 exhibit featured a unit with a hi-res display.
Dave McGuire's fabulous Digital Pavilion was a smorgasbord of DEC goodness that filled a truck.
[ read more ]

IMSAI 8080 / Thinkertoys Backplane proj

by billdeg - 04/20/2008
Total messages in this thread: 4
Last Post: [ Progress on Imsai 8080 ] 01/31/2010
Project Update: 1. Replaced tantalum capacitors c15, c16, c17, c18 2. Applied power. MC78M12CT (on the schematic it's IC4) started to smoke. Updated pics: New Board pics (have 4/20 file date) power supply pics (have 4/20 file date) One of two things is going on... 1) The IC's are dry/brittle and need to be replaced, the 4 new tantalum capacitors did not smoke after being replaced, it was simply the MC78M12CT (IC4) turn. 2) There is an issue with the power, and that's what's blowing out the ic's. ... [ read more ]

DEC Pictures - PDP, VAX, Alpha Pics

by billdeg - 04/04/2015
Total messages in this thread: 1
Two Digital PDP 11/40 computers. Both are housed in 72" cabinets The left cabinet contains a standard front panel and on the right stands a PDP 11/40 "industrial11" type.
Picked up a few new restoration projects for me and some friends including a PDP 11/40 "industrial 11" and regular PDP 11/40. Other items include some Altair 8800b-T unit with drives, two Alpha Servers, two VAX Servers, two PDP 11/34's, two PDP 11/44's, and related parts and peripherals. I will create separate threads for each as they're restored. Pictures... [ read more ]
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