https://gitlab.synchro.net/main/sbbs/-/commit/e81fb58e5d5e2b5b2cbb3f9c
Modified Files:
xtrn/syncarcade/README.md
Log Message:
xtrn/syncarcade: warn that pruning a parent romset breaks its clones

Hiding a romset by moving it out of roms/ looks like housekeeping and is a trap: a clone loads its graphics ROMs and PROMs out of its PARENT's zip, and the parent is frequently the entry that looks most redundant. Moving puckman.zip aside -- "Pac-Man (Japan)" and "Pac-Man" being obviously the same game -- silently breaks pacman.zip, which is the Midway clone of it. MAME does not search sub-directories of the ROM path either, so relegating one to a sub-directory is exactly as fatal as deleting it.

Nothing can warn about this at run time: the parent/clone relationship is in MAME's driver tables, invisible to both the lobby and the door, so the game stays in the picker and the player is told only that the content is wrong for this core.

Document [roms] exclude as the way to drop a menu entry while leaving the file where MAME can still reach it, and cross-reference it from the romsets section.

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https://gitlab.synchro.net/main/sbbs/-/commit/2c2f8a8b29bac2702a96b8fa
Modified Files:
xtrn/syncarcade/README.md
Log Message:
xtrn/syncarcade: record the measured dirty-rect hit rate

Measured in active play over SyncTERM: 80-90% of frames patched rather than repainted on Pac-Man and Frogger, 20-30% on Galaga. The spread is the games and not a defect -- a static maze with a few sprites crossing it is the best case, while Galaga moves an entire formation at once and most of its frames correctly fall back to a whole frame.

Worth having written down: "it depends on the game" is unfalsifiable, and these two numbers give the next person a range to sanity-check a change against.

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