mirror of
https://github.com/Abdess/retroarch_system.git
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a5553def94
boytacean (GB Rust, 6 boot ROMs embedded), emux_chip8 (no BIOS), fake08 (PICO-8, Lua runtime compiled in), jaxe (CHIP-8, fonts hardcoded), lowresnx (fantasy console), opentyrian (Tyrian freeware data), openlara (Tomb Raider engine, game data), squirreljme (J2ME, 8 JARs), vitaquake2 (Quake 2, 4 variants), xrick (data.zip sound pack) 145 total profiles.
44 lines
1.6 KiB
YAML
44 lines
1.6 KiB
YAML
emulator: "emux (CHIP-8)"
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type: libretro
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source: "https://github.com/libretro/emux"
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cores:
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- emux_chip8
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systems:
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- chip8
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notes: |
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emux is a multi-system emulator supporting CHIP-8, Game Boy, NES, and
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Sega Master System as separate libretro cores. The CHIP-8 core
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(emux_chip8) does not require any external BIOS or firmware files.
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The CHIP-8 architecture has no real BIOS. The standard font/character
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set (hex digits 0-F, 5 bytes each = 80 bytes) is hardcoded in
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mach/chip8.c:40-57 as the char_mem[] array. On reset, this font data
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is copied into the beginning of the 4 KB RAM (address 0x000-0x04F)
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via memcpy in chip8_reset() at mach/chip8.c:105.
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ROM loading: the game ROM is loaded via file_open(PATH_DATA, ...) in
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chip8_init() at mach/chip8.c:68-74. On reset, ROM contents are copied
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into RAM starting at address 0x200 (mach/chip8.c:113). The core
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accepts .ch8, .bin, and .rom extensions (libretro/Makefile.rules:20).
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Memory map from mach/chip8.c:17-20:
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0x000-0x04F font/character data (hardcoded)
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0x050-0x1FF unused
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0x200-0xFFF program ROM + working RAM
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The libretro frontend retrieves the system directory via
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RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY (libretro/libretro.c:34) but
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only uses it as a general config path, not for BIOS loading.
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files: []
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platform_details:
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bios_mapping:
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target: "none"
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source_ref: "mach/chip8.c:40-57, mach/chip8.c:98-115"
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notes: |
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No external BIOS. The 80-byte character font is compiled into the
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binary as char_mem[] and memcpy'd into RAM[0x000] on every reset.
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This is standard CHIP-8 behavior -- all interpreters embed the font.
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