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  • daver2's Avatar
    Today, 01:23 PM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    OK. So I have disassembled the 4052 V5 microcode + the other ROMS from the ALU board. I am slowly starting to understand what it does and how it...
    95 replies | 3432 view(s)
  • 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...
    95 replies | 3432 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 | 416 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 | 1281 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 | 122 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...
    95 replies | 3432 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...
    95 replies | 3432 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 | 1085 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...
    95 replies | 3432 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 | 459 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...
    95 replies | 3432 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...
    95 replies | 3432 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...
    95 replies | 3432 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...
    95 replies | 3432 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. ...
    95 replies | 3432 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 | 573 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 | 573 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...
    95 replies | 3432 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...
    95 replies | 3432 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... ;)
    95 replies | 3432 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...
    95 replies | 3432 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...
    95 replies | 3432 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
    95 replies | 3432 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 | 1233 view(s)
  • daver2's Avatar
    April 9th, 2018, 01:23 AM
    +1 for Chuck's post regarding the flag setting code. I have written a number of emulators also (some of which are in commercial products) - and this...
    31 replies | 1233 view(s)
  • daver2's Avatar
    April 8th, 2018, 08:34 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    Nice work you guys :-)! Dave
    95 replies | 3432 view(s)
  • GanjaTron's Avatar
    April 7th, 2018, 05:26 AM
    Hi Jos, this is indeed good news! Fantastic job! Count me in for a PCB! I finally put my 4052 together again last night, so next time something...
    13 replies | 459 view(s)
  • daver2's Avatar
    April 6th, 2018, 02:55 AM
    daver2 replied to a thread Tek 405x web-browser emulator in Other
    A few minutes between finishing one spreadsheet and starting another... FDUP - possibly duplicating what is on the floating point stack? FSWP -...
    95 replies | 3432 view(s)
  • daver2's Avatar
    April 5th, 2018, 08:06 AM
    daver2 replied to a thread Mod8 in Other
    Not had much to do today - so working on the MIL a bit... I have a spreadsheet deailing the pinouts of each card - so I can pretty much see how...
    5 replies | 395 view(s)
  • daver2's Avatar
    April 4th, 2018, 10:38 PM
    daver2 replied to a thread Mod8 in Other
    I thought you would have parts of the MIL somewhere Falter! If you ignore the EPROM programmer part of the 'motherboard', I wonder if the rest of...
    5 replies | 395 view(s)
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SW/HW design engineer

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