sl0pboy - a Game Boy Color emulator (companion to the gbos OS) https://git.sl0p.foo/sl0pboy.git/atom/tools/gbshot.py?h=master 2026-07-16T23:08:48Z 2026-07-16T23:08:48Z gbc dev gbc@localhost 2026-07-16T23:08:48Z urn:sha1:c714fc8927c454b5cf4735429b4cc9cde7aa5760 2026-07-14T22:37:04Z gbc dev gbc@localhost 2026-07-14T22:37:04Z urn:sha1:12e67588053160d2f9599a09ef932f9b37b1b873 The APU was a black hole: reads returned 0xFF, writes were dropped. That hangs any game that fades music out by decrementing the NR50/rAUDVOL volume register until it reads 0 (Pokemon's StopMusic spin-wait) - the write never stuck, the read never hit 0, infinite loop. Store the 48 sound registers and return them with the standard hardware read-back OR-masks (NR50 mask 0x00 = exact readback). No synthesis, just correct register behavior.