mirror of
https://github.com/Abdess/retroarch_system.git
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Every profile now has: - profiled_date: date of source code analysis - core_version: version from libretro-core-info .info files - display_name: human-readable name from .info files 260/260 profiles complete. 294/294 libretro cores covered. Standalone emulators (cemu, rpcs3, xemu, vita3k) versioned manually.
71 lines
2.6 KiB
YAML
71 lines
2.6 KiB
YAML
emulator: EmuSCV
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type: libretro
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source: "https://github.com/wzcwzc/emuscv"
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profiled_date: "2026-03-18"
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core_version: ""
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display_name: "EPOCH/YENO Super Cassette Vision"
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display_name: "EPOCH/YENO Super Cassette Vision"
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cores:
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- emuscv
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systems:
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- scv
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notes: |
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EmuSCV is an Epoch/YENO Super Cassette Vision emulator for libretro,
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based on eSCV by Takeda Toshiya.
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BIOS loading in src/vm/scv/memory.cpp:initialize() (line 71-242). The core
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tries multiple filenames in order: upd7801g.s01, upd7801g.bin, upd7801g.bios,
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bios.rom, bios.bin. First successful open wins.
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The BIOS is read as 0x1000 (4096) bytes into the bios[] array, mapped
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read-only at CPU address 0x0000-0x0FFF (UPD7801 internal ROM area).
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When CHECKBIOS core option is YES or AUTO, the core computes MD5 of the
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loaded data and compares against 635a978fd40db9a18ee44eff449fc126. If the
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hash does not match, the BIOS is rejected (zeroed out, bios_present=false).
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When CHECKBIOS is NO, any file content is accepted.
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The font/character data is embedded within the BIOS at offset 0x200
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(memory.h:163 get_font() returns bios + 0x200). No separate font ROM file.
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The core can start without BIOS (supports_no_game=true) but shows
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"BIOS not found" or "Bad BIOS" on the OSD. Games will not run without it.
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The .info file declares firmware_count = 1, firmware0_opt = false.
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files:
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- name: "upd7801g.s01"
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system: scv
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required: true
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size: 4096 # 4 KB, UPD7801G internal ROM
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md5: 635a978fd40db9a18ee44eff449fc126
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note: "UPD7801G internal ROM (BIOS). Mapped at 0x0000-0x0FFF. Contains character font at offset 0x200."
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source_ref: "src/vm/scv/memory.cpp:74, libretro-core-info/emuscv_libretro.info"
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aliases:
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- "upd7801g.bin"
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- "upd7801g.bios"
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- "bios.rom"
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- "bios.bin"
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platform_details:
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cpu: "NEC UPD7801G"
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bios_mapping:
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upd7801g:
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target: "0x0000-0x0FFF (CPU internal ROM, 4 KB)"
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format: "raw binary"
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source_ref: "src/vm/scv/memory.cpp:249"
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notes: |
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Memory map from memory.cpp:initialize():
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0x0000-0x0FFF BIOS ROM (read-only)
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0x2000-0x3FFF VRAM (8 KB)
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0x8000-0xFF7F Cartridge ROM (up to 4 banks of 32 KB)
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0xFF80-0xFFFF CPU internal RAM (128 bytes)
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Font data lives inside the BIOS at offset 0x200, accessed via
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get_font() for the VDP character rendering (src/vm/scv/vdp.cpp).
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cartridge_loading:
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formats: "cart, bin, rom, 0 (multi-file: .0/.1/.2/.3), zip"
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banking: "4 banks of 32 KB via PC5/PC6 port lines"
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source_ref: "src/vm/scv/memory.h, src/vm/scv/memory.cpp"
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