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#perq — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #perq, aggregated by home.social.

  1. Tom Stepleton @[email protected] ·

    45 days until #RetroFest 2026 in Swindon. #PERQ status:

    • Flaky Z80-based I/O subsystem: sometimes the #Z80 jumps off the tracks and executes nonsense code
    • Disk boots fail: the microcode attempts to load blocks far beyond the end of the disk

    Trying today: DIY diagnostic microcode

    #retrofest #perq #z80
  2. Tom Stepleton @[email protected] ·

    POV: #PERQ hardware debugging, as usual. The #Z80 (serving as an I/O coprocessor) is behaving strangely: fetching instruction bytes without toggling the M1 pin, jumping to random locations at around 47uS after coming out of reset; what's going on here?

    #perq #z80