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https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
78fd70ae50
The SDL build reads vMac.ROM, fixed at build time to the Mac Plus ROM name and 128 KB (setup/SPCNFGAP.i:60-63), and checks it against three Mac Plus checksums (src/CONTROLM.h:1344-1388). Search order: --rom, the executable's directory, mnvm_rom/ under the SDL pref path, the working directory (src/OSGLUSDL.c:546-620).
66 lines
3.2 KiB
YAML
66 lines
3.2 KiB
YAML
emulator: "Mini vMac 37"
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type: standalone
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core_classification: community_fork
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source: "https://github.com/minivmac/minivmac"
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profiled_date: "2026-10-20"
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source_commit: "6860a9a7f372c461b25dc42974b191a453ebcfb2"
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core_version: "37.03"
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display_name: "Apple - Macintosh Plus (Mini vMac 37)"
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mode: standalone
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cores: []
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systems:
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- apple-macintosh
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notes: |
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Mini vMac 37.03 (setup/SPBASDEF.i:21-24), maintained from Paul C. Pratt's
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code (setup/SPBASDEF.i:30). The emulated model, the ROM name, the ROM size
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and the accepted checksums are fixed when the setup tool writes the build configuration, so one binary runs
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one model. The default model is the Macintosh Plus (setup/SPBLDOPT.i:101,108).
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The entries below describe a build with -m Plus, which is also the default.
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The setup tool names the ROM after the model (setup/SPCNFGAP.i:28-63):
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Twig43.ROM (Twig43), Twiggy.ROM (Twiggy), Mac128K.ROM (128K),
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MacPlusKanji.ROM (Kanji), MacSE.ROM (SE), SEFDHD.ROM (SEFDHD), Classic.ROM
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(Classic), PB100.ROM (PB100), MacII.ROM (II), MacIIx.ROM (IIx) and vMac.ROM
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for 512Ke and Plus. ROM sizes per model are set at setup/SPBLDOPT.i:3229-3257
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and the per-model checksums at setup/SPCNFGAP.i:81-126. A build for another
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model reads only the name of that model.
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The SDL backend (-api sdl, sd2 or sd3, src/OSGLUSDL.c) looks for the ROM in
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this order (src/OSGLUSDL.c:606-620): the path given by --rom or -r
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(src/OSGLUSDL.c:4962-4968), the directory given by -d or else the directory
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of the executable from SDL_GetBasePath (src/OSGLUSDL.c:576-604,5185), the
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mnvm_rom folder under SDL_GetPrefPath("gryphel", "minivmac")
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(src/OSGLUSDL.c:546-573,5187), then the working directory. The executable
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directory and the preference folder are searched only on SDL 2 and later
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(src/OSGLUSDL.c:67-72). The default Linux backend is X11
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(setup/GNBLDOPT.i:1609-1621), which searches the command line path, the
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executable directory, ~/.gryphel/mnvm_rom/ and the working directory
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(src/OSGLUXWN.c:957-1022).
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When no ROM loads, the emulator keeps running and waits for a ROM image
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dropped on its window (src/OSGLUSDL.c:470-483,620).
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At startup the SDL backend mounts disk1.dsk to disk9.dsk from the executable
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directory, stopping at the first missing one (src/OSGLUSDL.c:486-540). These
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are user disk images.
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files:
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- name: "vMac.ROM"
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system: apple-macintosh
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path: "vMac.ROM"
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required: true
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min_size: 131072
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validation: [size]
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source_ref: "setup/SPCNFGAP.i:60-63,115-124, setup/SPBLDOPT.i:3240-3243, src/OSGLUSDL.c:435-468,606-620, src/CONTROLM.h:1314-1326,1344-1388"
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note: >
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Macintosh Plus ROM. LoadMacRomFrom reads kROM_Size bytes, 131072 for the
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Plus (setup/SPCNFGGL.i:73-77), and rejects a shorter file. ROM_IsValid
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then compares the first long word of the image with the three Plus
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checksums 0x4D1EEEE1 (v1), 0x4D1EEAE1 (v2) and 0x4D1F8172 (v3), and
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recomputes the sum of the 16-bit words from offset 4 over 131072 bytes,
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which must equal the stored value. A ROM that fails either test is
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refused. The -chr 0 setup option compiles both tests out
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(setup/SPBLDOPT.i:3288-3311, setup/SPCNFGAP.i:128-130,
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src/CONTROLM.h:1309-1310).
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