mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-14 12:52:31 -05:00
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.
45 lines
1.6 KiB
YAML
45 lines
1.6 KiB
YAML
emulator: JAXE
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type: libretro
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source: "https://github.com/libretro/jaxe"
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cores:
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- jaxe
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systems:
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- chip8
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notes: |
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JAXE is a CHIP-8, SCHIP, and XO-CHIP emulator by Kurtis Dinelle,
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ported to libretro. Supports .ch8, .sc8, .xo8, and .hc8 ROMs.
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No external BIOS or font files required. The core has firmware_count = 0
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in jaxe_libretro.info and never calls RETRO_ENVIRONMENT_GET_SYSTEM_DIR.
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Font data is hardcoded in chip8_load_font() at src/chip8.c:119-168.
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The standard 4x5 hex font (0-F, 80 bytes) is loaded at address 0x000,
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and the SCHIP 8x10 big hex font (0-F, 160 bytes) follows immediately
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after at address 0x050. Both are written directly into chip8->RAM[]
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during chip8_reset() -> chip8_load_font().
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Memory layout from include/chip8.h:42-45:
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0x000-0x04F standard font (NUM_FONT_BYTES = 80)
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0x050-0x0EF big font (NUM_BIG_FONT_BYTES = 160)
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0x0F0-0x0FF stack (STACK_SIZE = 16)
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0x100-0x10F audio buffer (AUDIO_BUF_SIZE = 16)
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0x200+ program ROM (PC_START_ADDR_DEFAULT)
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The fonts/dbgfont.ttf file in the repo is only used by the standalone
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build (src/main.c:19) for the SDL debugger overlay, not by the
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libretro core.
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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: "jaxe_libretro.info:13, src/chip8.c:119-168"
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notes: |
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All font/sprite data is compiled into the binary. The standard
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CHIP-8 hex font (5 bytes per character, 16 characters) and the
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SCHIP big hex font (10 bytes per character, 16 characters) are
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stored as a static array in chip8_load_font() and copied into
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RAM on every reset. No file I/O is performed for BIOS or fonts.
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