mirror of
https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
e7aa9e870b
Each libretro profile records version_basis and core_version is read there at its pin. snes9x states 1.63 in snes9x.h, nestopia 2.0.0, mgba 0.11.0, vice 3.10, atari800's libretro tree 7.0.0. Cores whose build takes its version from git carry the nearest tag in describe form (flycast v2.7-90-ge88b0ce, ppsspp, duckstation, gearcoleco), placeholders copied from .info files (Git, SVN) are replaced by the code's statement, and a code that states none is null with kind none.
55 lines
2.0 KiB
YAML
55 lines
2.0 KiB
YAML
emulator: "emux (CHIP-8)"
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type: libretro
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core_classification: official_port
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source: "https://github.com/libretro/emux"
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upstream: "https://github.com/sronsse/emux"
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profiled_date: "2026-03-23"
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source_commit: "3e558cb15157fcb1944846a845547d369605c963"
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core_version: "0.1"
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version_basis:
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kind: file
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path: "configure.ac"
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pattern: 'AC_INIT\(\[emux\],\s+\[([0-9][\w.+-]*)'
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display_name: "CHIP-8 (Emux CHIP-8)"
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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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exclusion_note: "CHIP-8 has no BIOS, font data hardcoded in char_mem[]"
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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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note: |
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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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