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IICX Troubleshooting Help

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    IICX Troubleshooting Help

    I have a IICX that does have some battery damage. I removed all the corroded parts around that area and replaced them - including the multiplexers next to the battery. I've also inspected all the traces around that area and really only found one that was totally dead and ran a bodge wire to to replace it, and of course I've replaced all the caps - even the through hole ones.

    When I switch the machine on I get a chime and a mouse pointer on the screen, but I can't move the mouse or anything. If I press the nmi button I get a 0000000F/00000013 error (which I've attached). Not quite sure where to go from here. I'm testing it with 4 1 meg sticks in bank a - closest to the battery. The one clue I have is if I take a set of known good sticks (4 4 meg sticks) out of a IISI fixed ages ago - I get absolutely nothing at all - no chime, no error from nmi etc. The video card I'm using is the Apple Mac II nubus card that came with the machine.

    Are there a set of minimalist diagroms I can use to troubleshoot post issues? I'm guessing not.

    I took this picture with a capture board:

    debug.png

    Picture of my work - I replaced all those 74 logic chips pictured - the corrosion seemed to stop just before the resistor packs.

    PXL_20210318_045300275_small.jpg

    #2
    so you get the dual chord 'good' chime and the screen with the mouse pointer, but then nothing no disk ? icon and no sad or happy mac unless you press the NMI key ?
    Current fleet
    TRS80 Model 4 - BBC B - Tatung Einstein - PCW9512 - PET 3032 - C64 - ZX81 - Spectrum 48K - Amiga A500 - Apple II europlus - Apple iMAC G3. Sharp MZ-80K. - IBM 5160 XT - Multibus 286/10 - Micro PDP 11/73 - Rainbow PC100A - MicroVax II - MicroVAX 3100, 3300, VAX 4000 VLC & 4000 Model 96 - AlphaStation 225Apricot PC - Apple Performa 6200 - Apple Mac IIcx

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      #3
      Correct - its kinda odd.

      One thing I want to fix is the adapter I made for the ATX power supply I'm using - the connectors are a bit loose and maybe there's some power draw issue. I noticed when I had a cheap logic analyzer connected to one of the multiplexors is a bit of rc tail (a slight slope on the beginning of the square wave).

      Do you know what kind of molex crimp pins I need to buy for a IICI/IICX?

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