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).
58 lines
2.3 KiB
YAML
58 lines
2.3 KiB
YAML
emulator: PD777
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type: libretro
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source: "https://github.com/W88DodPECuThLOl/PD777"
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profiled_date: "2026-03-18"
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cores:
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- pd777
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systems:
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- epochcv
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notes: |
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PD777 is an Epoch Cassette Vision emulator (NEC uPD777C CPU) with a libretro
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interface, by W88DodPECuThLOl.
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No BIOS or firmware files required. The .info file declares firmware_count = 0.
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Game loading in source/libretro/libretro.cpp:retro_load_game() (line 386-474).
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The core loads a code ROM file (.bin777) directly from the content path, then
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attempts to load a pattern ROM file (.ptn777) by replacing the extension.
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If neither file is found, the core falls back to hardcoded ROM data compiled
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from source/core/rom.cpp (Battle Vader program + pattern ROM dumps from
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oguchi-rd.com).
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The code ROM supports three formats:
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- Raw order: exactly 0xF00 bytes, program words in sequential address order
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- Raw address: address/data pairs (compiled-in rawRom[] array)
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- Formatted: header starting with "_CassetteVision_000" magic, version 0 or 1,
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includes key mapping, title, and code section at offset 0x100
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The pattern ROM supports three formats:
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- Formatted: 0x340 bytes, header "*CassetteVision*0000", 7x7 + 8x7 CG patterns
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- Raw bitstream: 0x4D0 bytes, bit-packed 7x7 and 8x7 character patterns
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- Built-in: fallback to patternRom[] / patternRom8[] arrays in rom.cpp
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The system directory path is retrieved via RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY
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but is not used for any file loading.
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Game identification uses a checksum over the loaded ROM to detect known cassettes
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(Battle Vader, Galaxian, etc.) and apply per-game key mappings and bent character
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tables. 11 cassette IDs are recognized (1-9, 11, 12).
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Supported extensions: zip, bin777, ptn777.
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files: []
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platform_details:
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cpu: "NEC uPD777C (uPD774 variant)"
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system: "Epoch Cassette Vision (1981)"
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region: "Japan"
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notes: |
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The Cassette Vision uses a NEC uPD777C (or uPD774 variant) as its main
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processor. Program ROM and pattern/character ROM are per-cartridge, not
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system-level. There is no system BIOS - the CPU executes directly from
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the cartridge ROM.
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The emulator supports analog paddles (4 paddles mapped to 2 analog sticks),
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lever switches, push buttons, course switch, and a lightgun peripheral.
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