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DECpc 433SLC Laptop

by billdeg
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
Total messages in this thread: 2
Updated: [ 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
Total messages in this thread: 3
Updated: [ IRSSI IRC #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
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
Total messages in this thread: 6
Updated: [ 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... [ read more ]

MITS 8800b Turnkey Restoration (#3)

by billdeg
Total messages in this thread: 3
Updated: [ 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
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
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
Total messages in this thread: 4
Updated: [ 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
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 ]

PDP 11/40 M7656 Serial Comms

by billdeg
Total messages in this thread: 3
Updated: [ Downloading programs via serial card ] 07/18/2015
Now that the core system is running again I can turn my attention to adding a display and disk drives to the system. I have a M7856 10 F-C (RS232 WITH 19.2 OPTION?) i.e. serial card and few terminals including a vt52 a LA36 Instructions for booting the PDP 11/40 using RL02 drives Next - I will replace one of the grant continuity cards and put in a M7762 (RL02 controller) in its place and attempt to boot from RL02 using M9312 ROM boot terminator card with RL02 ROM chip installed. I had a hopefully still working RL02 (01) and I bought a second drive from Ian last year (02). I have 10 or so RL02 packs, at least one should be a RT11 boot disk.">... [ read more ]

Altair 8800B Restoration

by billdeg
Total messages in this thread: 7
Updated: [ VR2 cap replacement no improvement ] 03/08/2015
The subject of this thread is to document the restoration of a previously-working Altair 8800B, which I accidentally shorted by inserting a RAM card with the power on (oops). After probing voltages and looking for A/C ripple, the general consensus of the MARCH workshop team was to open up the front panel to check for blown voltage resistors. The processor card checked out, but I could not examine memory locations or deposit memory. The front panel could not lock onto a location in memory, the front panel is largely un-responsive to toggled input.">... [ read more ]

Live long and prosper, Spock

by billdeg
Total messages in this thread: 1
Live long and prosper, Spock">... [ read more ]

Intellec MON 80 Monitor HEX Dump

by billdeg
Total messages in this thread: 5
Updated: [ Intel imm 6-26 PROM Memory Module ] 02/25/2015
Intel 1702A with MON 80 ROMs
Intel Intellec/8 MON 80 on 8 1702A ePROMs starting from address 3800H. Each 1702A has a sticker that reads MON 80 3800 (through ... 3F00) v. 3.0. Click image for larger view.
This set of 8 1702A ePROMs is installed in the bottom row of an Intel prom memory module imm 6-26. The IMM 6-26 had been around since the original Intellec/4, but I found references to this card in later Intellec system models for the 4040, 8008, 8080. I read that the 4040 version used 4 1702s, and the 8080 version used 16. My board has 8 1702's thus it could be argued that this is a ROM set for the 8008 (loose logic?) On the other hand, the label print style on the proms is similar to images I have seen of the MON 40 f">... [ read more ]

1966 Honeywell u-COMP DDP-516

by billdeg
Total messages in this thread: 1
Pictured is the cover from Honeywell's sales brochure of the u-COMP DDP-516 "...third generation general purpose digital computer...". The DDP-615 was a 16-bit word minicomputer expandable to 32K Core RAM memory. Machine I/O was done through the front panel switches and ASR 33 (or 35) Teletype. The DDP-516 was program-compatible with the DDP-116 and ran things like ASA FORTRAN IV.
Brochure">... [ read more ]
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