mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-10-11 05:53:23 -05:00
Abdessamad Derraz
11da070128
Upstream moved under 145 profiles: 679 refs shifted and 452 followed a renamed file, against 6,483 that still anchor where they were written. The recale rewrites the located ranges only, keeping the annotations and the sentences that carry them, and 106 pins advance in the same commit because refs and source_commit name one revision or the profile describes two at once. Nothing here was guessed. The 183 refs that are CHANGED, GONE or AMBIGUOUS are untouched, and the 57 profiles holding them keep their old pin until someone reads the diff: profile_sync refuses to recale a profile while any of its refs needs a re-read. trident kept its pin too, its annotated ref being one the writer will not rewrite.
51 lines
1.9 KiB
YAML
51 lines
1.9 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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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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