mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
ebc8e4413f
freeintv_ts_overlay (same BIOS as FreeIntv), bnes (NES, no BIOS), clownmdemu (Mega Drive, open-source MCD boot ROM embedded), m2000 (Philips P2000T, all embedded), mesen (NES, FDS + StudyBox BIOS), race (NGP, HLE with disabled BIOS loader), vemulator (VMU, HLE only), gw (Game & Watch, Lua simulator), pd777 (Cassette Vision, no BIOS), play (PS2, full HLE, LoadBIOS commented out) 115 total profiles.
53 lines
2.0 KiB
YAML
53 lines
2.0 KiB
YAML
emulator: RACE (Neo Geo Pocket)
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type: libretro
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source: "https://github.com/libretro/RACE"
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systems: [snk-ngp, snk-ngpc]
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notes: |
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RACE is a Neo Geo Pocket and Neo Geo Pocket Color emulator, originally
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developed for PSP (forked from Akop Karapetyan's port), adapted for
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libretro.
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No external BIOS files are required. The core contains dead code in
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race-memory.c that would load "NPBIOS.BIN" (64KB, loaded into cpurom
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via filestream_open), but it is compiled out with #if 0 and loadBIOS()
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unconditionally returns 0. The comment explains: "Using a real bios
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file causes nothing but issues" and references Card Fighters' Clash
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Test Mode as a known failure.
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Instead, the core uses a software HLE approach:
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- A built-in koyote_bin memory dump (RAM state from a real console
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post-boot) is copied into mainram at startup
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- A fake SWI jump table is constructed at cpurom[0xE000] using the
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TLCS-900H 0x1A (reg) dummy opcode to trap BIOS calls
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- doBios() in tlcs900h.c handles 33 BIOS functions in software:
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shutdown, clock speed, RTC, screen mode, font rendering, flash
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read/write, communication, and sound control
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- Interrupt vectors are set up at cpurom[0xFF00] and interrupt
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handler code at cpurom[0xF800]
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- CPU RAM defaults (interrupt priorities, timers) are loaded from
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the ngpcpuram[256] table
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The Z80 sound CPU is emulated in software (cz80 or DrZ80 backend).
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Flash memory for game saves is handled internally by flash.c.
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The only core option affecting system behavior is ngp_language
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(english/japanese), which sets a RAM flag at 0x6F87.
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ROM extensions: .ngp, .ngc, .ngpc, .npc
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files: []
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analysis:
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npbios:
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filename: NPBIOS.BIN
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size: 65536 # 64 KB (0x10000)
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loaded_by: "race-memory.c:loadBIOS()"
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status: disabled
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source_ref: "race-memory.c:337-361"
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notes: |
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loadBIOS() is wrapped in #if 0 and always returns 0.
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Even if re-enabled, the realBIOSloaded=1 path has known
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compatibility issues (e.g. Puzzle Bobble fails to boot).
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The HLE path is the only functional code path.
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