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Diagnosing PDP 11 h742a 15V failure

by billdeg - 01/23/2017
Total messages in this thread: 1
The backplane lost the +/- 15V signal while I was testing the drive controller.
The power supply is hard to get to in the rack. Pictured is the h742a power supply disconnected from the rack but not the computer. I positioned two cinder blocks on each side of the rack with a strong board between them to form a table. Unbolted from the rack I was able to move the h742a 90 degrees to sit it on the board with the power connections intact. Now the unit is much easier to access. Click image for larger view.
I removed the power control board from two h742s including the... [ read more ]

Slugging it through XXDP Diagnostics

by billdeg - 07/06/2016
Total messages in this thread: 11
Last Post: [ Checking 15V to RL11 ] 12/24/2016
DEC PDP 11/40 and RL02 undergoing repairs
PDP 11/40 in chassis with rack arms extended. RL02 sitting on top of rack. Click image for larger view.
Found at lot here, but not ZRLG or ZRLH http://www.retro...evices/RL02.html so, I am going to try the maindec-11-dzrla-a-pb1 and maindec-11-dzrla-a-pb2 - and I see that ak-e038b-mc and ak-e039b-mc I think replaced the first two. * * * * * * UPDATE - found page 2-40 RL01-RL02 user guide to confirm CZRLAAO and CZRLBAO are correct. "..These diagnostics can be run free-standing under the Diagnostic S... [ read more ]

simH notes

by billdeg - 01/12/2017
Total messages in this thread: 3
Last Post: [ CHIP connection to serial terminal ] 01/14/2017
pocket CHIP simH RT-11
simH RT-11 running on the Pocket CHIP single board computer.
Here is the simh layout I have settled on so I can have all types of emulation in one place. I have a /BIN for the emulator bin files (altair, pdp11, nova, vax, etc.) created by the MAKE process from the source files. I also created a directory for each emulator to hold system-specific ini and media files. Assuming you're using a linux for these things, and you're set up the same way... 1. Log in 2. $ cd [../simhdir]/[emulatordir] where [emulatordir] = name of system such as pdp11 eg. $ cd/simh/PDP11 3. $ ../BIN/pdp11 (the file that the MAKE process created you want to use) 4. At this point you should be at the simh> prompt. sim... [ read more ]

Raspberry Pi PiDP8 Emulator rev 2015

by billdeg - 01/10/2017
Total messages in this thread: 1
PiDP8 2015 Model
This is the 2015 version with the little dots on the white switches. I think I placed the first or second paid order, shipped in July of 2015, but I finally got around to building the kit over the 2016 Christmas holiday. These kinds of projects I like to save for the right moment, a very enjoyable kit. Hats off to Oscar Vermeulen for his fine work designing both the kit and the software. Click image for larger view.
Pi Zero as PiDP8 emulator
I chose the Pi Zero because it can feed off a USB port for power. There are just enough ports to connect... [ read more ]

Looking for Help with Tandon 602S

by falen5 - 01/08/2017
Total messages in this thread: 2
Last Post: [ Tandon 602s 603s SASI ] 01/08/2017
I am a vintage computer collector and recently acquired a strange machine that seems to be hacked together from a machine from Yugoslavia , an apple ii, what i think is tandon 602S 5mb hard drive, with the controller board and an interface to the apple II.A Diy powersupply, 12' onboard monitor and analog board, 5.25' floppy drive. I have made a video log of my findings with this machine. At present I am trying to get the motherboard working. When it is working I will be rebuilding the machine. The tandon drive is the big question as I have no idea about these drives or how to acess it. Here is a link to the first part of this 9 part video log.. so far. https://www.yout...DXmQU&t=1308s Please excuse my 'colorful' irish language. cheers Adrian ... [ read more ]

PDP 11/40 Industrial 11 model

by billdeg - 04/06/2015
Total messages in this thread: 3
Last Post: [ Front Panel Repairs ] 12/22/2016
PDP 11/40 expansion chassis
Digital made a PDP 11/40 "industrial11" model. The front panel coloring is different but otherwise operates the same as the standard unit.
PDP 11/40 industrial 11 bottom chassis card cage
Pictured here is a view of the bottom card cage with the main CPU and memory module. Click image for larger view.
PDP 11/40 industrial 11 expansion chassis [ read more ]

Commodore BASIC test program

by billdeg - 12/21/2016
Total messages in this thread: 1
Looking for a nice screen save type graphic for your Commodore 64 and probably many other platforms? 10 PRINT CHR$(205.5+RND (1));:GOTO10... [ read more ]

Visual Technology Inc Model 1050

by billdeg - 03/31/2010
Total messages in this thread: 15
Last Post: [ XEBEC Drive Controller Overheating? ] 12/16/2016
The Visual Technology Inc Model 1050
I have a perfectly working Visual Technology 1050 system with Winchester hard drive option. There is however one problem. I have three keyboards and they're all bad. The problem is similar to that of the Processor Technologies SOL Terminal Computer and other keyboards made with a foam contact pad in each key. About 25% of the pads have turned to dust. To format the Winchester drive I was forced to swap keyboards just to get certain keys to print on the screen. I needed all three keyboards to initiate the hard drive format! There has to be an easier way.
The Visual Technology Inc Model 1050 keyboard.
... [ read more ]

Atari 1200XL (1983)

by billdeg - 12/13/2016
Total messages in this thread: 1
Atari 1200XL Pitfall!
The 1983 Atari 1200XL computer, with Pitfall! cart in use. Click image for larger view.
Here is a closeup of the Pitfall! screen. It looks more or less the same as the Atari 400 and 800 systems' display of the same cart. In fact my testing shows that one could use any 400/800 cart in the 1200XL. Click image for larger view.
Close up view of the Atari 1200XL. Click image for larger view.
I got this compute... [ read more ]

Televideo PM/286

by billdeg - 06/22/2009
Total messages in this thread: 4
Last Post: [ Set up Process ] 12/12/2016

The Televideo PM/286 Computer with 8 user ports. The PM/286 is a near IBM AT clone with notable features such as a 286 processor with external switch to change from 8 mhz to 6 mhz (should you be feeling a bit slow that day) and cassette port for backup storage.
This model has a high resolution color CGA card, a Novell controller and a 8-port user controller. I have a complete batch of the system software, and I would like next to return this system to original condition. The manuals make it clear that this is an MS DOS based system. I put the computer in the same class as the ear... [ read more ]

IBM System/360 Model 44 Pamphlet

by billdeg - 12/09/2016
Total messages in this thread: 1
IBM System/360 Model 44 Pamphlet
Pictured is the cover of the IBM System/360 model 44 pamphlet brochure from 1968/69. The System/360 model 44 was oriented specifically toward scientific applications, but otherwise its code and instruction set was compatible with the /30 through /75 models. Click image to download PDF.
... [ read more ]

UNIVAC Proposal to Philip Morris 11-1968

by billdeg - 11/18/2016
Total messages in this thread: 1
Model calling for backups. UNIVAC 9300 system. Click image for larger view
UNIVAC 9200 brochure
UNIVAC 9200 brochure cover. Sperry Rand liked their UNIVAC product models making phone calls. Or maybe they're calling product support. Or maybe Sperry Rand hires its product models to also work in their customer support department. Click image for larger view

I picked these images from the brochures included with the following proposal to Philip Morris dated November 1, 1968. I really love the pretty, hot, psychedelic photos of women and their UNIVAC 9000... [ read more ]

Computer Products Co. Card Inventory

by billdeg - 03/04/2014
Total messages in this thread: 2
Last Post: [ Request for Pictures ] 11/02/2016
Thread date is last update date. MAKE OFFER(S) Computer Products / CP A Fort Lauderdale Firm that makes controller cards for engineering purposes. These cards may have been used in a DEC A/D system in the 80's. PART NUM / DESCRIPTION / (QTY) 021-177 LL GATE CARD (2) 021-058 OPTICALLY ISOLATED INPUT 006-019-0 A/D CONVERTER 021-161 4 CHAN RGTR D/A CONV (2) 021-0027 DIGITAL OUTPUT 021-0176 021-5229 021-0032 021-0205 RELAY BOARD 021-5232 RELAY BOARD 021-5389-0008 PANEL SWITCH BD 021-5235 PANEL LIGHTS 021-100 PANEL LIGHTS 021-0016 021-0004 TERMINATOR? 021-099 DIGITAL INPUT TEST --- EXTENDER PD --- CONSOLE RIBBON CABLE CONNECTOR ... [ read more ]

Photos from this site on NeXTstation

by billdeg - 10/30/2016
Total messages in this thread: 1
Honeywell DDP-516 photo from vintagecomputer.net displayed on NeXTstation color monitor.
NeXTstation color desktop networked via TCP/IP, running Omniweb2 browser, open to vintagecomputer.net and displaying Honeywell DDP-516 photo. Click image for larger view.
NeXTstation color desktop networked via TCP/IP, running Omniweb2 browser, open to vintagecomputer.net
NeXTstation color desktop networked via TCP/IP, running Omniweb2 browser, open to vintagecomputer.net. I used website search to locate a photo of the NeXTstation boot screen. What you se... [ read more ]

CompuPro S-100 Computer

by billdeg - 08/28/2009
Total messages in this thread: 9
Last Post: [ Compupro Disk Images ] 10/29/2016
I have ben working on a CompuPro S-100 8086/8085 256K RAM system with dual Qume 842 disk drives and a Qume terminal. Pretty beefy. I am working through some disk formats to see how that goes... More Pictures... [ read more ]
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