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  • GanjaTron's Avatar
    November 21st, 2017, 03:30 AM
    Hi Dave, thanks for the disassembly. That does indeed assert CLRPER, which clears the parity error latch. I would assume this NMI handler is...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 20th, 2017, 11:29 AM
    Hi Dave, thanks for the update. I suppose then it's a parity error only lasts 1µsec or so. ;) Quick update from my side: I met up with Jos at...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 14th, 2017, 01:05 PM
    Hi Dave, thanks for clarifying the RAM organisation. What do we do if the non-socketed NEC µPDs are faulty? I can unsolder one with a some...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 14th, 2017, 12:39 PM
    Hi Jos, that thing looks like just what we need; It will even identify the faulty chip! I grabbed your docs (btw, the JPGs aren't readable) and...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 12th, 2017, 03:38 PM
    Hi again, Dave. Just to clarify: from my understanding, that's how the firmware ROMs map into the address space. Each block is comprised of an...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 12th, 2017, 03:07 PM
    Wow, thanks Dave! Unfortunately we don't know anything more about the extended instructions other than their mnemonics and addressing modes in the...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 12th, 2017, 09:38 AM
    Oh, and thanks for confirming my ancient logic analyser actually works, Dave. I can now probe with confidence. ;)
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 12th, 2017, 09:37 AM
    HI Dave, hi Jos. many thanks for your efforts in deciphering the firmware -- I am REALLY impressed! Yes, the ROMs logically start at 0x4800 but...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 11th, 2017, 04:14 AM
    Jos, I can't P.M. you -- it says your inbox is full... :(
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 9th, 2017, 03:39 PM
    Micro-update: Jos' V5.1 firmware dumps are actually identical to those from my rev9 MAS ROMs. So either the ROMs are ok after all, or I'm just too...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 9th, 2017, 02:58 PM
    Quick update: the tape drive actually pulled RESTART low when connected, thereby locking everything up. Obviously the logic on the tape drive is...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 8th, 2017, 08:41 AM
    Hi Jos, I assume both of the MAS firmware revisions I have (rev4 and rev9) are probably dodgy. I compared the rev4 with those from Christian Corti...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 7th, 2017, 07:57 AM
    Anyone else have these?
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 7th, 2017, 06:31 AM
    Hi Jos, just to clarify: no usable tapes means you have tapes, but they're unreadable? I wonder if that helps with a comatose system... ...
    96 replies | 7271 view(s)
  • GanjaTron's Avatar
    November 7th, 2017, 06:09 AM
    Hi Dave, hi Jos, thanks for the info and the new ROM dumps, may try these out on my later MAS board. Just to clarify: are the ROMs labelled...
    96 replies | 7271 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]
"Any appearance of danger is simply a device to enhance your experience" [Futureworld, 1976]

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