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  • thunter0512's Avatar
    Yesterday, 09:14 AM
    Thanks Doug! The direct connection of the LOAD_DAR_H from the SBC6120 to the latch on the IOB6120 has eliminated the problem completely. No...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    Yesterday, 01:03 AM
    Success! On a hunch using a wire I connected pin 15 (LOAD_DAR_H) of the 50 pin header (J4) on the SBC6120 directly to the 74ACT373 latch-enable...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    Yesterday, 12:24 AM
    The GAL firmware sources and JED files are different as compared to what is on their websites. It seems I cannot attach a ZIP file, so if you PM me...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 26th, 2021, 09:10 PM
    Thanks Dave, I think I now understand the panel mode and the logic implemented in the memory GAL dealing with MM0 - MM3. Bob and Jim sent me...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 25th, 2021, 10:20 AM
    Thanks Dave, I am a bit lost with this "panel mode". I will have to read up about this to understand the difference between "panel mode" and...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 25th, 2021, 08:46 AM
    Hmmm ... I wrote a small loop using the SBC6120 monitor which continuously issues the 6410 IOT (as suggested by Dave earlier) and the LOAD_DAR_H...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 25th, 2021, 06:29 AM
    Thanks Dave, I have the files from both RBC archive and the originals from Bob's site. They match. Both ICs are in the correct orientation. Not...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 25th, 2021, 04:41 AM
    Bob Armstrong has created a great product, but he has also has created a terribly confusing mismatch of files where the GAL sources don't match the...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 24th, 2021, 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...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 24th, 2021, 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...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 23rd, 2021, 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...
    31 replies | 833 view(s)
  • thunter0512's Avatar
    January 23rd, 2021, 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...
    31 replies | 833 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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...
    165 replies | 10581 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 | 544 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 | 544 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 | 544 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...
    100 replies | 9019 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)....
    165 replies | 10581 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 | 217 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 | 1426 view(s)
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Tom Hunter
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Perth in Western Australia

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