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  • thunter0512's Avatar
    Today, 08:12 AM
    Thanks Dave, This issue is getting me increasingly confused. I tried to go back to basics and follow the logic by probing the inputs and outputs...
    15 replies | 497 view(s)
  • thunter0512's Avatar
    Today, 05:09 AM
    Thanks Kevin, I used my TL866CS EPROM programmer to compare Jim's IOT1B.jed with the IOT1 contents and it verified good. Strangely IOT2 did not...
    15 replies | 497 view(s)
  • thunter0512's Avatar
    Yesterday, 08:37 AM
    If I understood the seller correctly the systems was working many years ago, but when he tried it just before he sold it, the terminal & keyboard...
    15 replies | 497 view(s)
  • thunter0512's Avatar
    Yesterday, 05:25 AM
    Previously my workbench was full with a LAB-8/E I have been repairing so I took a break from the IOB6120 debugging. Last night and today I...
    15 replies | 497 view(s)
  • thunter0512's Avatar
    January 20th, 2021, 05:51 AM
    Edit2: I noticed that the file SDA0:BASIC.UF was the last file in the directory listing. On a hunch I just renamed the file to BASIC.JK and recopied...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 20th, 2021, 04:47 AM
    Thanks Dave! The error mis-reports that it is a write when in fact it is a read. The last few messages from os8disk are: Successfully completed...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 19th, 2021, 07:46 AM
    Thanks Dave. The article provides some useful additional detail that is missing in Kyle's document. I might take a break from SerialDisk and see...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 19th, 2021, 07:35 AM
    Thanks David. I redid the whole process described in Kyle's docment and answered "N" when it asked "WRITE ZERO DIRECTORY?" and the system seems...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 18th, 2021, 11:15 PM
    After adding the horizontal jumpers the M8650 works perfectly at addresses 40/41 and at 115200 bps the SerialDisk server works much nicer. I...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 18th, 2021, 05:59 PM
    Thank you Doug!!! I am obviously blind. :-( Now that you pointed out the horizontal jumpers I wonder how I missed them. I prefer the M8650...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 18th, 2021, 07:23 AM
    Thanks David! The M8650 works perfectly well with the original 14.418 MHz crystal running at 115200 bps while using it as a console UART at...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 17th, 2021, 05:02 PM
    Sorry David, You linked to Doug's article so I wrongly guessed "djg" is Doug. For the higher speeds to work I would need power of 2 multiples...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 17th, 2021, 05:27 AM
    Thanks Doug, I found a possible local supplier of the crystal and I hope I will get it quicker from Melbourne/Victoria than via Digikey or Mouser...
    152 replies | 10119 view(s)
  • thunter0512's Avatar
    January 16th, 2021, 03:17 AM
    I have succcessfully booted OS/8 via Kyle Owen's SerialDisk via a M8655 running at 19200 bps. I also found that my terminal connection using the...
    152 replies | 10119 view(s)
  • 1944GPW's Avatar
    January 14th, 2021, 10:36 PM
    There are a few threads here on VCF with lots of details, but basically, add a bunch of solenoids, and time their firing right. Most of the hobbyist...
    14 replies | 500 view(s)
  • 1944GPW's Avatar
    January 14th, 2021, 10:10 PM
    'Low-priced' is the kicker. The December 1975 BYTE also announces the IBM 5100 and with it the IBM 5103 80 cps 132-column dot matrix line printer,...
    14 replies | 500 view(s)
  • 1944GPW's Avatar
    January 13th, 2021, 11:04 PM
    Not specifically aimed at the home market but used for a home "hobby" computer project was the Philips 60SR mosaic (dot matrix) printer, an article...
    14 replies | 500 view(s)
  • 1944GPW's Avatar
    January 12th, 2021, 08:01 PM
    That looks like it works pretty well. 3D printing can be so indirectly useful for making jigs so other materials such that other materials can be...
    94 replies | 8695 view(s)
  • thunter0512's Avatar
    January 12th, 2021, 07:45 AM
    The next step in my Lab-8/e adventure will be to get OS/8 to boot using Kyle Owen's SerialDisk application (https://github.com/drovak/os8diskserver)....
    152 replies | 10119 view(s)
  • 1944GPW's Avatar
    January 11th, 2021, 06:59 PM
    TI Speak & Spell? https://en.wikipedia.org/wiki/Speak_%26_Spell_(toy) Can you perhaps sketch a rough picture of it? Approximate size?
    3 replies | 189 view(s)
  • 1944GPW's Avatar
    January 10th, 2021, 03:59 PM
    Sounds like a fairly easy thing to make 100% identical repops from thin card using a CNC vinyl/stencil cutting machine, then you'd never run out. ...
    32 replies | 1295 view(s)
  • thunter0512's Avatar
    January 10th, 2021, 05:10 AM
    Hi Roland, I too have an RX01 to restore (this came with the Lab-8/E I am restoring). Until now I have only blown out decades of dust, decaying...
    11 replies | 519 view(s)
  • 1944GPW's Avatar
    January 9th, 2021, 09:59 PM
    It's a quiet Sunday arvo in lockdown so thought I would have a go at modelling it from photos, just eyeballing the measurements. It's fully...
    5 replies | 293 view(s)
  • thunter0512's Avatar
    January 9th, 2021, 09:48 PM
    Just to put the density difference into perspective ... The straight-8 core memory shown in https://pdp-8.nz/index.php/repairing-core-memory/ is...
    69 replies | 3328 view(s)
  • thunter0512's Avatar
    January 9th, 2021, 12:59 AM
    Hmmm - the cores and the wires are microscopic. There may be some original jigs which were used to manufacture these cores and maybe these could be...
    69 replies | 3328 view(s)
  • thunter0512's Avatar
    January 9th, 2021, 12:49 AM
    Thanks Dave, Yes the MM8-EJ board kit could be modified to turn it into a 4K kit but fortunately the owner of the Lab-8/E found a H212 board so I...
    69 replies | 3328 view(s)
  • thunter0512's Avatar
    January 9th, 2021, 12:32 AM
    I very carefully checked along the section of core and the posts for any visible damage using magnifying goggles looking through a magnifying light....
    69 replies | 3328 view(s)
  • thunter0512's Avatar
    January 8th, 2021, 12:22 AM
    I have tried to reflow both sides without any improvement. I have even attempted to solder a bit further back on the pad by applying liquid flux...
    69 replies | 3328 view(s)
  • thunter0512's Avatar
    January 7th, 2021, 11:31 PM
    Thank you Kevin! I don't know why I missed this when I originally tried to locate the pad. The other end of the core wire is just opposite the...
    69 replies | 3328 view(s)
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Recent Entries

APL\360 typeball for the IBM 1052 and I/O Selectric

by 1944GPW on January 24th, 2020 at 11:01 PM
This is just for a bit of fun, now you can 3D print your own APL\360 typeball ('golfball') for a Selectric, I/O Selectric, 1052 printer-keyboard or IBM 1130:



You can find it at https://www.thingiverse.com/thing:4126040
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ASR 33 teletype chad box

by 1944GPW on January 13th, 2019 at 11:53 PM
I had a go at doing the ASR 33 chad bucket in CAD so you ought to be able to just print one off now.
https://www.thingiverse.com/thing:3353088
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DEC PDP-11/03 switch paddle, LED receptacle and console board

by 1944GPW on March 16th, 2018 at 11:21 PM
I have an MDB Systems workalike LSI-11 backplane which I am starting to get working. I thought it would be nice to build the DBCOK logic and console switches to have the same look and feel as the original PDP-11/03 console so I scripted up the specific DEC switch paddle and LED receptacle as part of the project (which is ongoing) so they can be 3D printed and use a tiny Arduino to do the powerup sequence.

If you have a PDP-11/03 or a PDP-11/05 with missing or broken switch paddles then

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IBM System/360 and System/370 console button replica inserts

by 1944GPW on December 9th, 2017 at 11:19 PM
In case you need some stopgap inserts in a /360 or /370 console, until you find the originals (which I have found is very difficult).
They pass the 'Six foot Rule' test ie. they look good from 6 feet away.

Attachment 42404 Attachment 42405

See https://www.thingiverse.com/thing:2703172
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PTAP2DXF - make paper tapes without a punch

by 1944GPW on December 1st, 2017 at 06:04 AM
If you have a paper tape reader and no punch, you can now make real working paper tapes using a normal home stencil-cutting machine.
I've written a small command line utility that can take a .PTAP (or any other binary or textfile) and generate output that these
machines will cut. that your reader will read.
Attachment 42216Attachment 42217
It can easily make repair pieces for existing old broken tapes from any byte offset. In addition it can

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