mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-04-13 12:22:33 -05:00
60d9d38d69
mame2003_plus (16 BIOS ZIPs, MAME 0.78 naming), mame2010 (51 ZIPs), mame2016 (37 ZIPs incl Lindbergh), hbmame (MAME 0.220, no custom BIOS), tyrquake (no BIOS), cannonball (29 OutRun ROMs with CRC32), uzem (open source, no BIOS), vecx (ROM embedded), emuscv (UPD7801G), b2 (BBC Micro standalone, ROMs bundled) 81 total emulator profiles covering all libretro cores with firmware. Cross-reference: 731 undeclared files, 186 already in repo.
67 lines
2.4 KiB
YAML
67 lines
2.4 KiB
YAML
emulator: EmuSCV
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type: libretro
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source: "https://github.com/wzcwzc/emuscv"
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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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