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https://github.com/Abdess/retroarch_system.git
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e13e8734b9
240 file-level entries used notes: instead of the canonical note: field. verify.py and cross_reference.py only read note:, so these were silently ignored.
64 lines
2.2 KiB
YAML
64 lines
2.2 KiB
YAML
emulator: VeMUlator
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type: libretro
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core_classification: official_port
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source: "https://github.com/libretro/vemulator-libretro"
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upstream: "closed-source Android app (removed from Google Play ~2020)"
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profiled_date: "2026-03-25"
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core_version: "0.1"
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display_name: "VeMUlator"
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cores:
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- vemulator
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systems:
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- sega-vmu
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notes: |
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Sega Dreamcast VMU/VMS emulator. Same author (Mahmoud Jaoune) ported
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the original Android Java app to C++ for libretro. Emulates the Sanyo
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LC8670 CPU, 128 KB flash, 48x32 LCD, piezo buzzer, and timers.
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No BIOS files required. The core uses HLE exclusively: startCPU()
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checks BIOSExists (always false), then initializeHLE() sets SFR
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registers and system RAM directly (vmu.cpp:193-222).
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A loadBIOS() function exists (vmu.cpp:82-137) handling encrypted and
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unencrypted BIOS images, but is never called from the libretro
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interface. retro_load_game() only loads game flash data, with no
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system directory query. README lists BIOS support as planned.
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files: []
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platform_details:
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hle_implementation:
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source_ref: "vmu.cpp:195-222"
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sfr_init:
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SP: "0x7F"
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PSW: "0x02"
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IE: "0x80"
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MCR: "0x08"
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P7: "0x02"
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OCR: "0xA3"
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BTCR: "0x41"
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ram_init:
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- "0x31 = 0xFF (battery level)"
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- "0x6E = 0xFF"
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- "P3 = 0xFF (no buttons pressed)"
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- "BCD date/time at 0x10-0x16, raw at 0x17-0x1D"
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note: |
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HLE skips the BIOS boot sequence and jumps directly into the loaded
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game. System clock, date, and button state are initialized in RAM.
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The EXT register is set to 1 to signal HLE mode to the CPU
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(vmu.cpp:198-199). Games that depend on BIOS-initialized state
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beyond what HLE provides may not work correctly.
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unused_bios_loader:
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source_ref: "vmu.cpp:82-137"
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max_file_size: 61444
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rom_load_size: 61440
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encryption: "XOR 0x37 after stripping 4-byte header"
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detection: "first byte 0x2A (JMPF) = unencrypted, otherwise encrypted"
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note: |
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The loadBIOS() method is fully implemented but unreachable from the
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libretro interface. No system directory query, no BIOS path construction,
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and no call site exists in main.cpp. A future update could wire this up
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to support real VMU firmware boot (file manager, clock, mini-games menu).
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