mirror of
https://github.com/Abdess/retroarch_system.git
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38 lines
1.5 KiB
YAML
38 lines
1.5 KiB
YAML
emulator: Beetle WonderSwan (Mednafen WonderSwan)
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type: libretro
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core_classification: pure_libretro
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source: "https://github.com/libretro/beetle-wswan-libretro"
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upstream: "https://mednafen.github.io/"
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profiled_date: "2026-03-24"
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core_version: "v0.9.35.1"
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display_name: "Bandai - WonderSwan/Color (Beetle Wonderswan)"
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cores: [beetle_wswan, mednafen_wswan]
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systems: [bandai-wswan, bandai-wswanc]
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notes: |
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Beetle WonderSwan is a fork of Mednafen's Cygne module for WonderSwan
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and WonderSwan Color emulation via libretro.
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No external BIOS or firmware files are required. The core bypasses the
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original boot ROM entirely by hardcoding the initial I/O register state
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in mednafen/wswan/start.inc (a 256-byte table of power-on defaults for
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all hardware registers 0x00-0xFF). On reset, WSwan_MemoryReset() in
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wswan-memory.c zeroes RAM and writes a fixed 8-byte identifier at
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0x75AC, then the CPU starts executing the cartridge directly.
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Internal EEPROM owner data (name, birthday, sex, blood type) is
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configured through core options (wswan.name, wswan.byear, wswan.bmonth,
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wswan.bday, wswan.sex, wswan.blood) and initialized at boot by
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WSwan_EEPROMInit() without needing a real EEPROM dump.
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The wswan.language core option selects English or Japanese, which is
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returned via I/O port 0xC8+ as the hardware language flag. This
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replaces the boot ROM's language selection screen.
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The NEC V30MZ CPU is emulated in software (v30mz.c). Sound DMA,
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cartridge banking, and RTC are all handled internally.
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ROM extensions: .ws, .wsc, .pc2
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files: []
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