macintosh iisi

  1. jack 68k

    Reconnaissance: Modern Diagnostics for your Classic Mac

    #MARCHintosh 2026 is here and I'm excited to share a project I've been working on. https://reconnaissanceapp.com You may know that many Classic Mac models have a diagnostics mode built into the ROM that you can access over a serial connection. But it's extremely cumbersome, limited, and there...
    • jack 68k
    • Thread
    • diagnostics macintosh ii macintosh iicx macintosh iisi macintosh lc iii macintosh se/30 marchintosh2026
    • Replies: 12
    • Forum: Macintosh II
  2. BullyFreeBear

    Macintosh IIsi, Recapped, quite chime, no display.

    I had recently gotten a Macintosh IIsi that didn't have any signs of life. I've gone through it and recapped a fair amount of the power supply and tested the voltages, I was getting a solid +12.3 +5.4 -12.3. The machine powered up but no display or chime, I thought nothing more then it just...
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