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Thread: Powertran Cortex

  1. #341
    Join Date
    Aug 2011
    Location
    Near Hindhead, Hampshire. UK
    Posts
    162

    Default

    How about the people here who bought the other NOS pcb's, how are you getting on ?

    Jim

  2. #342
    Join Date
    Jul 2009
    Location
    Southampton, UK
    Posts
    169

    Default

    Just waiting for you to iron the bugs out of the assembly instructions Jim. Good to hear you're getting some space to carry on playing.

    Stuart.

  3. #343
    Join Date
    Jul 2009
    Location
    Southampton, UK
    Posts
    169

    Default

    TMX9909s on ebay - item 120901292390.

    Stuart.

  4. #344
    Join Date
    Aug 2011
    Location
    Near Hindhead, Hampshire. UK
    Posts
    162

    Default

    Thanks Stuart,
    I just bought one as a spare incase it's differnet to the ones that other Jim kindly sent me for testing.
    Sheds are built, i just need it to stop raining so i can fully waterproof, insulate and line them !!

    Jim

  5. #345
    Join Date
    Sep 2012
    Location
    Bradford, West Yorkshire, England
    Posts
    12

    Default

    Hi all,

    I've just rescued my Cortex (Mk 1) from my mum's loft and now need to reassemble it and see if it still works.

    Steve

  6. #346
    Join Date
    Jul 2009
    Location
    Southampton, UK
    Posts
    169

    Default

    Welcome Steve,

    The perceived wisdom seems to be to test the power supply before (re-)connecting it to the main board.

    What was the spec of your Cortex? Disk drives?

    Stuart.

  7. #347
    Join Date
    Sep 2012
    Location
    Bradford, West Yorkshire, England
    Posts
    12

    Default

    It's the original version with no addons. I cannibalised some parts from it years ago, so I need to replace those before I can test it.

    Steve

  8. #348

    Default

    Is there any source for Cortex PCBs? I did own one and was made throw it out - something to do with marriage. I would really like to build one again.

  9. #349

    Default

    A few of them turned up on eBay within the last year or so that were actually new old stock Cortex II boards. Other than finding a deal like that, your only options now would be to find an assembled one for sale (they do turn up now and then) or to take the time to do a new board layout (a bit expensive to do the boards though, as there isn't a huge base of Cortex owners out there). Patience is the real key--I had to hunt for several years before I found one, but they've started to turn up a lot more often since I started this thread a few years ago.

  10. #350
    Join Date
    Aug 2011
    Location
    Near Hindhead, Hampshire. UK
    Posts
    162

    Default

    Finally got my recently built Cortex kit back onto the bench in the new workshop.
    Still got one of the 2 old problems, it sees keypresses from the keyboard but not the correct ones.
    Without shift, ctrl etc pressed most keys generate a space on the display.
    With control pressed most keys generate graphics characters.
    The graphics key and shift don't seem to alter what the keys do.
    The signals leaving the keyboard seem correct but i will be sure tonight when i get the USB logic analyser hooked up to it.
    Then it's going to be looking at the input port chips on the motherboard, i've already swapped the chip out but that hasn't helped.
    Though, when i was working on it before swapping the chip input out (74LS251) did cure the problem for a short period of time.

    At the moment the seeming overheating of the cpu problem seems to have gone, but did i swap the CPU out when i was working on it back in last November, i can't remember

    Jim

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