mirror of
https://github.com/Abdess/retroarch_system.git
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d929424988
- Added profiled_date field to all 204 existing profiles for update tracking - Created 56 alias profiles for cores that share BIOS with a parent (e.g., mednafen_psx -> beetle_psx, fbalpha2012 -> fbneo) 260 total profiles covering all 294 libretro cores (204 unique + 56 alias).
89 lines
3.7 KiB
YAML
89 lines
3.7 KiB
YAML
emulator: Frodo
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type: libretro
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cores: [frodo]
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source: "https://github.com/libretro/frodo-libretro"
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profiled_date: "2026-03-18"
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systems: [commodore-c64]
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notes: |
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Frodo is a Commodore 64 emulator by Christian Bauer (Frodo V4.2), ported
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to libretro. It emulates the C64 (MOS 6510, VIC-II, SID, CIA x2) and an
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optional 1541 floppy drive.
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All four ROMs are embedded directly in the core binary as compiled-in
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byte arrays (Basic_ROM.h, Kernal_ROM.h, Char_ROM.h, 1541_ROM.h). No
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external BIOS files are required for normal operation.
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The core attempts to load external ROM files from the current working
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directory (DATADIR is empty in the libretro build) at startup via
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load_rom_files() in main.cpp. If any file fails to open or has the wrong
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size, the embedded ROM is used as fallback via memcpy(). The filenames
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are hardcoded with spaces, no subdirectory prefix.
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ROM loading order in load_rom_files():
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1. "Basic ROM" (8192 bytes, BASIC_ROM_SIZE 0x2000) -> TheC64->Basic
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2. "Kernal ROM" (8192 bytes, KERNAL_ROM_SIZE 0x2000) -> TheC64->Kernal
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3. "Char ROM" (4096 bytes, CHAR_ROM_SIZE 0x1000) -> TheC64->Char
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4. "1541 ROM" (16384 bytes, DRIVE_ROM_SIZE 0x4000) -> TheC64->ROM1541
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The core does NOT construct paths relative to retro_system_directory for
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ROM loading. The system directory variable is fetched in retro_init() but
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only used for the save directory fallback, not for ROM path construction.
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DATADIR defaults to "" (empty string) when not defined by the build
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system, so the filenames resolve to bare names in the cwd. In practice,
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the external ROM loading path is effectively unused in the libretro build
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since the cwd is unpredictable and the filenames contain spaces.
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The Kernal ROM is patched at runtime by PatchKernal() in C64.cpp for
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fast reset (addresses 0x1D84-0x1D85) and IEC bus replacement when 1541
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processor emulation is enabled (multiple addresses in the 0x0D00-0x0E00
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range are patched with 0xF2 trap opcodes).
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The 1541 drive ROM is also patched at Reset() in C64.cpp: ROM checksum
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verification is disabled (0x2AE4-0x2AE9 NOPed), DOS idle loop is
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trapped (0x2C9B), and write sector / format track operations are
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intercepted (0x3594-0x3598, 0x3B0C-0x3B0D).
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Source: Src/main.cpp:67-115 (ROM defines, load_rom, load_rom_files),
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Src/C64.h:33-37 (ROM size constants), Src/C64.cpp:221-284 (PatchKernal),
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Src/C64.cpp:738-746 (Reset ROM patching),
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Src/Basic_ROM.h, Src/Kernal_ROM.h, Src/Char_ROM.h, Src/1541_ROM.h
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(embedded ROM arrays)
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files:
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- name: "Basic ROM"
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system: commodore-c64
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description: "C64 BASIC V2 ROM"
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required: false
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embedded: true
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size: 8192
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note: "Embedded as builtin_basic_rom[] in Basic_ROM.h. External file never loaded in practice (DATADIR is empty, path is bare filename in cwd)."
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source_ref: "Src/main.cpp:71,77,100-102"
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- name: "Kernal ROM"
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system: commodore-c64
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description: "C64 Kernal ROM"
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required: false
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embedded: true
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size: 8192
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note: "Embedded as builtin_kernal_rom[] in Kernal_ROM.h. Patched at runtime for fast reset and 1541 IEC traps."
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source_ref: "Src/main.cpp:72,78,104-106"
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- name: "Char ROM"
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system: commodore-c64
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description: "C64 Character Generator ROM"
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required: false
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embedded: true
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size: 4096
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note: "Embedded as builtin_char_rom[] in Char_ROM.h. Used by VIC-II for text/bitmap rendering."
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source_ref: "Src/main.cpp:73,79,108-110"
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- name: "1541 ROM"
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system: commodore-c64
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description: "Commodore 1541 floppy drive ROM"
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required: false
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embedded: true
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size: 16384
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note: "Embedded as builtin_drive_rom[] in 1541_ROM.h. Patched at runtime to disable checksum and trap disk I/O."
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source_ref: "Src/main.cpp:74,80,112-114"
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