mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-11-12 04:53:52 -06:00
Abdessamad Derraz
5df3a707e6
The note judged the CHECKBIOS handling instead of describing it. It now says what memory.cpp:80 does: the MD5 comparison runs only for YES_VAL, so AUTO accepts any content. A rejected BIOS is filled with 0xFF (line 97), not zeroed.
86 lines
3.2 KiB
YAML
86 lines
3.2 KiB
YAML
emulator: EmuSCV
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type: libretro
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core_classification: community_fork
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source: "https://github.com/wzcwzc/emuscv"
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upstream: "http://takeda-toshiya.my.coocan.jp/"
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profiled_date: "2026-03-23"
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source_commit: "6d6e4594d79862dd5c2ff7f725c109e4266f0b03"
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core_version: "0.12.20220726135800"
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version_basis:
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kind: file
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path: "Makefile.libretro"
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pattern: '^EMUSCV_VERSION_MAJOR := (\d+)\s*\nEMUSCV_VERSION_MINOR := (\d+)\s*\n(?:#.*\n)*EMUSCV_VERSION_DATETIME := \u0027?(\d+)'
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format: "{1}.{2}.{3}"
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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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Libretro port of eSCV by Takeda Toshiya (Common Source Code Project),
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ported to libretro by MARCONATO Maxime. Upstream source mirrored at
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https://github.com/tautologico/common-src-project (src/vm/scv/).
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BIOS loading in src/vm/scv/memory.cpp:initialize() (lines 74-243).
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Tries filenames in order: upd7801g.s01, upd7801g.bin, upd7801g.bios,
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bios.rom, bios.bin. First successful open wins. Upstream eSCV uses
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only BIOS.ROM (uppercase), and the libretro port renamed and added
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fallback aliases.
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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, the core computes MD5 of the loaded
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data and compares against 635a978fd40db9a18ee44eff449fc126. If the
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hash does not match, the BIOS is rejected (filled with 0xFF,
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bios_present=false). When CHECKBIOS is AUTO (default) or NO, any file
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content is accepted. With AUTO the log says "automatic (yes)", and the
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MD5 comparison runs only when the option equals YES_VAL
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(src/vm/scv/memory.cpp:80), so AUTO accepts any content.
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The font/character data is embedded within the BIOS at offset 0x200
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(memory.h 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
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it.
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The .info declares firmware_count=1, firmware0_opt=false. Matches code.
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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
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md5: 635a978fd40db9a18ee44eff449fc126
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validation: [md5]
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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:74-243"
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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:249-254"
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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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