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  • daver2's Avatar
    Yesterday, 02:10 PM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    I have started to disassemble the 4052 microcode tonight. I have already learned quite a lot... I shall have a look tomorrow between meetings...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 21st, 2018, 11:21 PM
    +1 Need close up photographs of front and back with detailed photographs of the text on the controls. Dave
    6 replies | 411 view(s)
  • daver2's Avatar
    April 21st, 2018, 11:17 PM
    daver2 replied to a thread 8080 TTL Project in Other
    Plus the fact that Marty has a 'track record' in assembling a working PDP-8 from TTL! Hi Marty, nice to see photographs of the new project... I...
    25 replies | 1279 view(s)
  • daver2's Avatar
    April 20th, 2018, 11:03 PM
    daver2 replied to a thread Hi all in Introductions
    Hi Tom, Welcome to VCFED. And I have software for a DPS 6... I am in Worcester. Where are you? Dave
    3 replies | 121 view(s)
  • Philcogrump's Avatar
    April 17th, 2018, 04:09 AM
    Have you checked the latest mc6800.js in Github? I reorganized how the code is structured and especially the function calls between mc6800.js and...
    93 replies | 3337 view(s)
  • Philcogrump's Avatar
    April 17th, 2018, 04:05 AM
    I don't know if https://github.com/jonbstanley/Tek405xEmulator is a good place for these images, but you could make a fork from this master branch,...
    93 replies | 3337 view(s)
  • GanjaTron's Avatar
    April 17th, 2018, 02:29 AM
    I wouldn't rule out yet another bad RAM, which is why I've ordered the diagnostix module rebuild from Jos. I've had those weird SYSTEM ERRORs come up...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 17th, 2018, 01:39 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    Good thinking about the diagnostic ROM/RAM (although disassembly is not a problem - as the emulator performs this on the fly). It would, however, be...
    93 replies | 3337 view(s)
  • Philcogrump's Avatar
    April 16th, 2018, 06:24 PM
    Thanks for attaching the files, I'll look through them. I was thinking we could keep the mc6800.js the same for both emulators and only the 4052...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 16th, 2018, 12:20 PM
    NiKo, I sent you a PM last month regarding the DPS6. Are you picking up PMs? Welcome to VCFED Mike. Regards, Dave
    11 replies | 1065 view(s)
  • daver2's Avatar
    April 16th, 2018, 12:10 PM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    Monty, I like the key graphics! Here is where I have got to on the 4052 emulator. I have added the extension instruction mnemonics to the table...
    93 replies | 3337 view(s)
  • GanjaTron's Avatar
    April 16th, 2018, 09:57 AM
    Thanks Jos! Just sent you an email. I should have no problem getting the parts apart from the programmed GAL; my old Data I/O predates those by a...
    13 replies | 456 view(s)
  • GanjaTron's Avatar
    April 16th, 2018, 01:51 AM
    Hi Monty. thanks for editing, I take it you got those from my goggle drive -- I forgot I'd already uploaded them there. ;) Thanks also for...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 15th, 2018, 02:49 PM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    It's getting a little late in the UK - so my mind is getting somewhat tired... Anyhow, I think I am at the point where the start-up code is...
    93 replies | 3337 view(s)
  • GanjaTron's Avatar
    April 15th, 2018, 02:39 PM
    Thanks for the info, Monty. I don't recall seeing CALL "EXEC" in my 4052's docs, so it appears to be indeed missing. Even then, the 4052's secret...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 15th, 2018, 11:25 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    I have now added some checks to avoid writing to ROM. This is applicable for the entire ROM space and for the area of ROM in the RAM space. It now...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 15th, 2018, 10:47 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    You win the prize! I remember seeing that article in the past as well... Anyhow, I am progressing with the 4052 modifications to mc6800.js. ...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 15th, 2018, 07:42 AM
    Yep, Use an 8080 disassembler - and see if it throws a fit with some of the binary instruction patterns - then look-up those in the Z80 manual and...
    14 replies | 565 view(s)
  • daver2's Avatar
    April 15th, 2018, 06:54 AM
    I have never come across one either. That doesn't mean there isn't one tucked in a corner of the internet of course... If any of the 'Z80...
    14 replies | 565 view(s)
  • daver2's Avatar
    April 15th, 2018, 06:33 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    Here is a post of my code. This should save me typing... Where I was at was to now look at how the CPU (mc6800.js) code accessed the memory and...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 15th, 2018, 06:05 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    >>> P.S. If you guys know a way to list a SECRET file, let me know... I think Roland has laid down a challenge :-)! I'll have a look at the...
    93 replies | 3337 view(s)
  • GanjaTron's Avatar
    April 15th, 2018, 05:58 AM
    P.S. If you guys know a way to list a SECRET file, let me know... ;)
    93 replies | 3337 view(s)
  • GanjaTron's Avatar
    April 15th, 2018, 05:52 AM
    Hi Dave, Jon, Monty, first off, congrats on this impressive effort! I've yet to try the emulator (having the real thing at hand), but I'm already...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 15th, 2018, 12:08 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    I got as far as looking at the 64K RAM / 64K ROM memory map. Of course (true to form) the 64K RAM also contains 'overspill' ROM! The mapping...
    93 replies | 3337 view(s)
  • Philcogrump's Avatar
    April 14th, 2018, 08:47 AM
    Nice, I did some further refinements and uploaded a new version with better look and feel. A few other to do's I have in mind: 1. There is a...
    93 replies | 3337 view(s)
  • Philcogrump's Avatar
    April 12th, 2018, 07:08 PM
    Just posted several improvements tonight. Added the 4 status indicators for power, busy, break, and io. Implemented DRBUSY so display erase can...
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 12th, 2018, 06:45 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    That's fine by me. Dave
    93 replies | 3337 view(s)
  • Philcogrump's Avatar
    April 10th, 2018, 06:03 PM
    Yes, there is a blinking F about 1.5 lines above the first line of text on a full screen condition. I'll let you tweak with the emulator window size.
    93 replies | 3337 view(s)
  • daver2's Avatar
    April 9th, 2018, 10:48 PM
    No typo. Dwight, I am doing an 8008 emulator. I just wanted to explain to the OP the fun and games I am having and what to look out for with their...
    31 replies | 1225 view(s)
  • Philcogrump's Avatar
    April 9th, 2018, 05:46 PM
    I just synced the master branch with the latest updates from Monty. I also added support for the COPY command to download a screenshot, there's also...
    93 replies | 3337 view(s)
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    http://www.vintage-computer.com/vcfo...ad.php?t=12058

    EPROM's don't last forever, and eventially you have to reburn them which I think is why your Tektronix isn't working. Have you tried contacting the guy to that website to see if he can reburn your EPROM's for you? Or if you have a EPROM burner, have you asked him to email you an image copy?
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"END OF LINE" [MCP, 1982]
"An admin that isn't a bit hackerish is just the guy mopping up the keyboard" [Phrack V0b I3f P12]
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