mirror of
https://github.com/Abdess/retroarch_system.git
synced 2026-10-21 11:19:11 -05:00
Abdessamad Derraz
50beb0ca27
o2em_bios defaults to o2rom.bin and only the chosen file is opened (libretro_core_options.h:52-64, libretro.c:989). Loading fails when it is missing or under 1024 bytes (libretro.c:160-189, 1043-1044). The four files share a variant group, o2rom.bin stays required, the others are optional. Only the first 1024 bytes are read and an unknown CRC still loads, so size becomes min_size and crc32 leaves validation.
95 lines
3.5 KiB
YAML
95 lines
3.5 KiB
YAML
emulator: O2EM
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type: libretro
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core_classification: community_fork
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core: o2em_libretro
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cores: [o2em_libretro]
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source: "https://github.com/libretro/libretro-o2em"
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upstream: "https://sourceforge.net/projects/o2em/"
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profiled_date: "2026-03-24"
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source_commit: "679d6fec04963f6e70a7ec217e3d0ebb1fe472fc"
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core_version: "1.18"
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display_name: "Magnavox - Odyssey2 / Philips Videopac+ (O2EM)"
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systems:
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- odyssey2
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- videopac
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notes: |
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Libretro port of O2EM, an Odyssey2/Videopac emulator by Daniel Boris
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and André de la Rocha. Port by Arlindo M. de Oliveira.
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One BIOS ROM selected via o2em_bios core option (default o2rom.bin).
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Loaded into rom_table[0] (1024 bytes), identified by CRC32. The CRC32 sets
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the model (vpp and bios), and an unknown one still loads with vpp=0.
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ref: libretro.c:194-226
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vpp=1 for Videopac+ variants (g7400.bin, jopac.bin).
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Core fails to load without the selected BIOS.
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Voice module ("The Voice" speech synthesis add-on) emulation via WAV
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samples in system/voice/. 9 banks × 128 samples, named {bank}{sample}.WAV
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(e.g. E480.WAV). Compiled with HAVE_VOICE=1 on most platforms. Optional:
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core works without samples, speech is silently skipped.
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BIOS loading: load_bios() at libretro.c:150-229.
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BIOS selection: libretro_core_options.h:52-64.
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Voice loading: init_voice() at src/voice.c:39-91, called from libretro.c:1060-1067.
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files:
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- name: "o2rom.bin"
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system: odyssey2
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required: true
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variant_group: "o2em-bios"
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min_size: 1024
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md5: "562d5ebf9e030a40d6fabfc2f33139fd"
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sha1: "b2e1955d957a475de2411770452eff4ea19f4cee"
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crc32: "8016a315"
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validation: [size]
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note: >
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Odyssey2 BIOS (G7000 NTSC), vpp=0. The default value of o2em_bios, so
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the core opens it unless another BIOS is chosen. retro_load_game fails
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when the chosen file cannot be opened or holds fewer than 1024 bytes.
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Only the first 1024 bytes are read.
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source_ref: "libretro_core_options.h:52-64, libretro.c:1143-1147, libretro.c:989, libretro.c:1043-1044, libretro.c:160-189"
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- name: "c52.bin"
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system: videopac
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required: false
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variant_group: "o2em-bios"
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min_size: 1024
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md5: "f1071cdb0b6b10dde94d3bc8a6146387"
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sha1: "a6120aed50831c9c0d95dbdf707820f601d9452e"
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crc32: "a318e8d6"
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validation: [size]
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note: "Videopac G7000 European BIOS. vpp=0, auto-sets PAL. Opened only when o2em_bios names it."
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source_ref: "libretro_core_options.h:52-64, libretro.c:1149-1155, libretro.c:1043-1044"
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- name: "g7400.bin"
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system: videopac
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required: false
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variant_group: "o2em-bios"
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min_size: 1024
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md5: "c500ff71236068e0dc0d0603d265ae76"
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sha1: "5130243429b40b01a14e1304d0394b8459a6fbae"
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crc32: "e20a9f41"
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validation: [size]
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note: "Videopac+ G7400 European BIOS. vpp=1. Opened only when o2em_bios names it."
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source_ref: "libretro_core_options.h:52-64, libretro.c:1156-1161, libretro.c:1043-1044"
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- name: "jopac.bin"
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system: videopac
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required: false
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variant_group: "o2em-bios"
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min_size: 1024
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md5: "279008e4a0db2dc5f1c048853b033828"
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sha1: "54b8d2c1317628de51a85fc1c424423a986775e4"
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crc32: "11647ca5"
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validation: [size]
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note: "Videopac+ G7400 French BIOS (JoPac). vpp=1. Opened only when o2em_bios names it."
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source_ref: "libretro_core_options.h:52-64, libretro.c:1162-1167, libretro.c:1043-1044"
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- name: "voice/"
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type: directory
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required: false
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category: game_data
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note: "The Voice speech synthesis WAV samples. 9 banks (E4, E8-EF) × 128 samples."
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source_ref: "src/voice.c:38-90, libretro.c:1060-1068"
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