2026-03-03 04:03 UTC
Anyone want to help figure out the Lisa A-trap dispatcher? I put a disassembly in a gist: https://gist.github.com/eschaton/2c9cdcddccd3dde177005872ddd6e946
#retrocomputing #lisa #m68k #MARCHintosh
Replies (1)
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@eschaton@mastodon.social 2026-03-04 00:09
Thanks to @larsbrinkhoff@mastodon.sdf.org for finding this documentation on the Lisa A-trap mechanism and its use in implementing IUJSR, IUJMP, IULEA, and IUPEA psuedo-instructions! https://bitsavers.org/pdf/apple/lisa/pascal_monitor/Pascal_Development_System_Internal_Documentation_Jan82.pdf#page=40