sl0pboy.git/src/cpu.c, branch master sl0pboy - a Game Boy Color emulator (companion to the gbos OS) https://git.sl0p.foo/sl0pboy.git/atom/src/cpu.c?h=master 2026-07-17T17:47:02Z cpu: log the $ED poweroff opcode with pc/registers 2026-07-17T17:47:02Z gbc dev gbc@localhost 2026-07-17T17:47:02Z urn:sha1:ef07ad11bb0a20f137682e901a0a6beacfc08968 The clean-exit opcode used to print nothing, so any guest crash that walked into a stray $ED byte was indistinguishable from a silent socket death (one of the kill vectors in the link-drop investigation). Now it identifies itself on stderr with pc/af/bc/de/hl/sp. headless: $ED opcode = clean power-off (exit + battery save) 2026-07-16T10:49:02Z gbc dev gbc@localhost 2026-07-16T10:49:02Z urn:sha1:ca6f9bb91893cf50c8e09bf7396085a7d69e80ab The unused SM83 opcode $ED now sets gb->poweroff, which breaks the headless loop so the normal cart_free()->cart_save() path runs. Lets a guest OS shut the emulator down cleanly (and flush its .sav) instead of relying on an external timeout/SIGTERM, which could SIGKILL before the save. run_frame() also stops on poweroff so exit is immediate. core emulator: SM83 CPU, MMU, timer, PPU, CGB support 2026-07-04T20:11:10Z gbc dev gbc@localhost 2026-07-04T20:11:10Z urn:sha1:bc48df9f7162a4a816fdc0edaa6ed08304008c9c Passes blargg cpu_instrs (all 11), instr_timing, mem_timing.