mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
d2adde9846
add core_classification, cores, upstream fields. fix false aliases (fixnes, fsuae, gearboy, higan_sfc, higan_sfc_balanced, potator, quicknes). add new profiles (fbneo_neogeo, flycast_gles2, genesis_plus_gx_wide). remove verbose notes and disclaimers.
54 lines
2.1 KiB
YAML
54 lines
2.1 KiB
YAML
emulator: "emux (SMS)"
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type: libretro
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source: "https://github.com/libretro/emux"
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profiled_date: "2026-03-19"
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core_version: "0.1"
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display_name: "Sega - Master System (Emux SMS)"
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cores:
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- emux_sms
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systems:
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- sms
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notes: |
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emux is a multi-system emulator by Sebastien Ronsse, supporting CHIP-8,
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Game Boy, NES, and Sega Master System as separate libretro cores.
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BIOS loading in controllers/mapper/sms_mapper.c:
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static char *bios_path = "bios.sms"; (line 33)
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#define BIOS_SIZE 0x2000 (line 7, 8192 bytes)
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sms_mapper->bios = file_map(PATH_SYSTEM, bios_path, 0, BIOS_SIZE);
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If file_map returns NULL, init returns false — core cannot start.
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No HLE fallback, no skip logic.
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BIOS enable/disable via slot control register port write (lines 74-90):
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bios_disable bit in control union. Reset clears bios_disable and
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adds BIOS region to memory map. Writing bios_disable=1 removes
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the BIOS overlay, exposing cartridge ROM underneath.
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Cartridge loading delegated to sega_mapper controller:
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ROM mapped via file_map(PATH_DATA, ...), 16 KB banks (BANK_SIZE=0x4000),
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3 bank slots (NUM_BANKS=3), bank select registers at 0xFFFD-0xFFFF.
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Memory map from mach/sms.c:
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0x0000-0xBFFF Mapper (BIOS overlay + cartridge ROM banks)
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0xC000-0xDFFF RAM (8 KB)
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0xE000-0xFFFF RAM mirror
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The .info declares firmware_count=1, firmware0_opt=false.
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is_experimental=true. No save states, rewind, or netplay support.
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Supported extensions: sms, bms, bin, rom.
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system_directory obtained via RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY
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(libretro/libretro.c:23-25), passed as "system-dir" config param.
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BIOS loaded from this directory via PATH_SYSTEM.
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files:
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- name: "bios.sms"
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system: sms
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description: "Sega Master System BIOS"
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required: true
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size: 8192
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md5: "840481177270d5642a14ca71ee72844c"
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source_ref: "controllers/mapper/sms_mapper.c:7 (BIOS_SIZE=0x2000), :33 (bios_path), :167-172 (file_map)"
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note: "Mapped at 0x0000, overlays cartridge ROM until bios_disable bit set in slot control register. No HLE — core fails to init without this file."
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