Search Posts:

Latest Projects:

Digital Rainbow 100 Restorations

by billdeg - 06/24/2016
Total messages in this thread: 2
Last Post: [ Archive VENIX ] 02/22/2017
DEC Rainbow 100+ removed from and resting upon it's pedestal case. Click for larger image.
This thread will document the restoration of two DEC Rainbow Model PC-100 B2 units. Both are not functional. One is a "plus" unit with a pedestal case. Otherwise they're pretty much the same.
DEC Rainbow display with plenty of screen rot, model VR-201. The display works inside, so the question is whether to attempt a repair or just swap with a non-working case. Click for larger image.
Model PC-100 B2 plus /... [ read more ]

VCFed Workshop Feb 2017

by billdeg - 02/15/2017
Total messages in this thread: 1
Commodore PET 2001-8
I spent most of my time working on a sick PET 2001-8. The display board failed. Click for larger view.
Commodore PET 2001-8
Pic of the friend resistor. I replaced this component, but we did not have a TIP29 that I think was the reason the resistor fried. This resistor has been replaced before. Click for larger view.
Mac 400K drive repair [ read more ]

Build a bootable RSX11/M on RL02 disk

by billdeg - 02/06/2017
Total messages in this thread: 1
Scan of my cover of the Digital pdp11 RSX-11M Beginner's Guide manual.
RSX-11M Manuals http://wwcm.syn...0Manuals.html This thread describes how one might use simH on a $9.95 Next Thing Co CHIP to make an RL02 image of RSX11/M V 4.0 BL 32 (BASELINE). I got the how-to via web search and clues from CCTECH and simH user group members interested in the project. My case - For my PDP 11/40 I have no working EIS option card. (Otherwise I'd be using UNIX 6.) I already have RT11 running but I wanted to try RSX11. I was told that RSX11/M v.4.0 BL 3.2 is the newest OS version compatible with my system. Distribution media disk images for RSX11/M can be found in RL01 format but not RL02, so I had to first build one RL01 boot disk using 4 RL01s and then port to RL02. [ read more ]

Computer History and Restoration Links

by billdeg - 02/04/2017
Total messages in this thread: 1
The thread date will be updated to indicate the last update. Suggest a site here. Bitsavers Software and Document Archive rTTY Art Repository http://artsc...LLECTION/ Datastore: Manuals and system docs galore. http://maben.ho...S100/index.html Dave Dunfield's Site - vintage computer newbies should start here, disk archiving info here Bryan's Old Computers Document Archive Every Computer That Ever Was (list) http://www.crowl...computer_list Samuel S Snyder's 1964 "History of NSA General-Purpose Electronic Digital Computers" http://www.g...DC_1964.pdf Personal Computer Milestones - Fun page that attempts to answer t... [ read more ]

1966-68 Honeywell u-COMP DDP-516 Console

by billdeg - 10/13/2016
Total messages in this thread: 3
Last Post: [ DDP-516 8K core ] 02/03/2017
Photo of a Honeywell u-COMP DDP-516 control console. The orange color scheme was used in the 1966~68 u-COMP models, see early advertisements. Many people know of the "kitchen computer", the 516 is the same thing, same instruction set as the DDP-316 (H316). If the 316 is the Kitchen Computer, the 516 is the "business" model. This console would sit on the operator's desk, or on top of the computer cabinet, which stood about 4 feet tall (need to check that). The operator would use the console buttons and switches as one would use a front panel. There is also a blue cover version of this consol... [ read more ]

KE11-E M7238 EIS Diagnostics

by billdeg - 02/02/2017
Total messages in this thread: 1
industrial/11 with frozen front panel after attempting to load UNIX without a working EIS controller card. The KE11-E Extended Instruction Set (EIS) is required for UNIX 6.
Up to this point I had not messed with using the optional EIS card, M7238, KE11-E in my 11/40 system testing. UNIX 6 requires this card, so I am going to test the card. Not sure if it works. Here is the basic info for the controller: KE11-E M7238 Extended Instruction Set EK-KE11E-OP-001 EK-KE11 E-OP KE11-E/F USER MANUAL EK-KE11E-TM KE11-E/F TECHNICAL MANUAL MP-KE11-B KE11-E MAINTENANCE PRINTS The manual says to cut the W1 jumper on the M7233 Decode card, which I did, as part of installation, plus attach the three ribbon cables between the M7238 and M7232. When I run the system wit... [ read more ]

Booting the System Using RL02 drive

by billdeg - 07/20/2015
Total messages in this thread: 14
Last Post: [ Progress / Checking Disks ] 02/01/2017
M9312 Bootstrap Terminator CONSOLE Test
I set the jumpers on the M9312 card to use the CONSOLE program. The CONSOLE is a monitor program that allows a person to load a RAM address, change memory, load and run programs rather than have to rely on the front panel. This image shows the echo character program from the manual. The last line reads: @STHIS IS A TEST.... @ is the prompt, S is the start command. I then typed THIS IS A TEST, without a LF CR. Click on image for larger view.
I have one RL01/RL02 ROMS that I can use with the M9213. I read the ROM to compare with the bootstrap listed below to verify I have the correct ones. The RL02 bootstrap is here https://ak6dn.dynd...9/23-751A9.lst Below I... [ read more ]

Slugging it through XXDP Diagnostics

by billdeg - 07/06/2016
Total messages in this thread: 14
Last Post: [ XXDP+ ] 02/01/2017
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 ]

Commodore Announces 128K Computer

by billdeg - 01/26/2017
Total messages in this thread: 1
Commodore B(C)128 Product Announcement, Byte Feb 1985
Notice anything wrong with this February 1985 product announcement, in Byte Magazine? Here is your hint. Click image for entire announcement.
The question is, was this a print error or did they really mean to call their new computer the B128? Were the various product departments within Commodore really that disconnected to not know of the real B128, forcing a last-minute name change, to C128? I know the original B128 was developed at about the same time as the C64, and flopped pretty quickly. Protecto bought out the inventory from Commodore and was still actively selling B128's in 1985 and for a number of yea... [ read more ]

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 ]

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 ]
OLDER POSTS (15 threads per page): 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 |


Buy a Commodore Computer Poster

Popular Topics and FAQs

Past Issues:

Cromemco s1 info display

This image was selected at random from the archive. Click image for more photos and files from this set.