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4am ❧ (a2_4am@mastodon.social)'s status on Wednesday, 25-Mar-2026 22:56:07 JST 4am ❧

RE: https://mastodon.social/@a2_4am/116072144942640899
Meta-note: this is the GOOD STUFF. This took me HOURS to debug, and in those hours I developed a mental model of a complex operation AND learned something new about ProDOS internals AND tested and discarded several theories before finally discovering the root cause and it was ALL WORTH IT. I don't want to outsource that to Dr. Flattery the Always-Wrong Chat Box. Why would I want to skip this? This is the WHOLE THING.
If you don't want to write software then don't.
In conversation about 3 months ago from mastodon.social permalink
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  4am ❧ (@a2_4am@mastodon.social)
  
  from 4am ❧
  
  Attached: 1 image The bug was not in the subroutine that recalculated the parent pointer. The bug was earlier, when it was deciding if it needed to recalculate it in the first place. The code is looking at the high byte of |POINT|, clearing bit 0 (AND #$FE), then comparing that to the high byte of |SDIR| — which was indeed one of the fields in the data structure I had just moved. Except I had shifted the data structure by 0x100 bytes, so SDIR was now odd, so its bit 0 was always 1, so this comparison never hit.

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