mirror of
https://github.com/Abdess/retroarch_system.git
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Abdessamad Derraz
b3b3880c19
Profiles that read two repositories, a libretro port and its upstream, now prefix each citation with source or upstream, decided by which tree carries the cited value at its pin. The emulator pages use the word to tell libretro glue, emulator code as the port carries it, and the upstream emulator apart.
119 lines
5.0 KiB
YAML
119 lines
5.0 KiB
YAML
emulator: A7800
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type: standalone
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core_classification: enhanced_fork
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source: "https://github.com/7800-devtools/a7800"
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upstream: "https://github.com/mamedev/mame"
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profiled_date: "2026-08-08"
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source_commit: "7a2afdc1ea08fc331b16b750d8c1f02d4ef62fc8"
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core_version: "5.2"
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display_name: "Atari - 7800 (A7800)"
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cores:
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- a7800
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systems:
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- atari-7800
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mode: standalone
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notes: |
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MAME fork by 7800.8bitdev.org built with the Atari 7800 driver alone. The
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released binary carries eight machines, all declaring a7800 as parent: NTSC
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and PAL at three palette temperatures, plus a developer mode showing DMA
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usage per scanline (a7800.cpp:1837-1844). The temperature variants were
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renamed after 5.2, from a7800u1/a7800u2/a7800pu1/a7800pu2 to
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a7800a1/a7800a2/a7800pa1/a7800pa2. ROM definitions are identical in both.
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Console BIOS is optional. Every entry carries ROM_OPTIONAL, so absence
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yields a warning rather than the fatal "Required files are missing" exit
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(romload.cpp:373-379, 488-493). The region is ERASEFF, and machine_reset
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reads the reset vector: when 0xfffe and 0xffff both hold 0xff, m_ctrl_reg is
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set to 4 and the console starts the cartridge (a7800.cpp:1529-1532). No code
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substitutes for the BIOS when it is absent.
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Lookup runs under rompath, which the shipped a7800.ini sets to "bios;roms".
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open_rom_file walks the parent chain (romload.cpp:567-572), so all eight
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machines fall back to the a7800 set, and the manual documents one merged
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archive at bios/a7800.zip. Inside an archive the search tries name with CRC,
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then CRC alone, then name (fileio.cpp:692-701), so a ROM whose filename
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differs from the driver still resolves. Loose files under rompath/a7800/
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match by name only. Loaded ROMs are checked for exact length and against the
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declared CRC32 and SHA1, and a mismatch is a warning (romload.cpp:417-455).
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The PAL BIOS keeps the filename 7800pal.rom, which mainline MAME has since
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renamed to c300558-001b.u7 for the same dump. Mainline also marks the 7800
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ROMs mandatory.
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Software list a7800 (hash/a7800.xml), attached by every machine
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(a7800.cpp:1577, 1608, 1654, 1684), holds add-on hardware rather than games:
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the High Score Cartridge and the XM Expansion Module, both backed by the
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same 4KB highscre.bin served as the pass-through cart ROM
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(hiscore.cpp:49-52, xm.cpp:177-183). Software list ROMs resolve as
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a7800/<setname> then <setname> under rompath (romload.cpp:628-650) and carry
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no optional flag, so selecting either configuration without the image exits
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with EMU_ERR_MISSING_FILES.
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The release ships the binary, a7800.ini, the manual, hash/a7800.xml, cfg
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defaults, bgfx shaders and artwork masks, and no roms, samples, plugins or
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language directory. The driver adds no samples device and no external
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layout. Crosshair bitmaps fall back to a compiled-in shape
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(crsshair.cpp:180-214) and the UI font to compiled-in data
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(rendfont.cpp:587-600).
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files:
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- name: a7800.zip
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required: false
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category: bios_zip
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system: atari-7800
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source_ref: "source src/mame/drivers/a7800.cpp:1698-1748"
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note: >-
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Merged console BIOS archive documented by the manual at bios/a7800.zip.
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Serves all eight machines through the parent chain, since the PAL
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machines are clones of a7800 rather than of a7800p.
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contents:
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- name: 7800.u7
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description: NTSC BIOS, default system BIOS "a7800", mapped at 0x3000
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size: 4096
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crc32: "5d13730c"
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sha1: "d9d134bb6b36907c615a594cc7688f7bfcef5b43"
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- name: c300558-001a.u7
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description: NTSC prototype BIOS with Asteroids, system BIOS "a7800pr"
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size: 16384
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crc32: "a0e10edf"
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sha1: "14584b1eafe9721804782d4b1ac3a4a7313e455f"
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- name: 7800pal.rom
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description: PAL BIOS with Asteroids, named c300558-001b.u7 in mainline MAME
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size: 16384
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crc32: "d5b61170"
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sha1: "5a140136a16d1d83e4ff32a19409ca376a8df874"
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- name: hiscore.zip
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required: false
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category: bios_zip
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system: atari-7800
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source_ref: "source hash/a7800.xml:8-21"
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note: >-
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Software list set for the High Score Cartridge configuration (CX78HSC,
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slot a78_hsc). Fatal when that configuration is selected and the set is
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absent.
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contents:
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- name: highscre.bin
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description: High Score Cartridge ROM, read through the pass-through cart
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size: 4096
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crc32: "9be408d3"
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sha1: "a3af676991391a6dd716c79022d4947206b78164"
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- name: xm.zip
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required: false
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category: bios_zip
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system: atari-7800
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source_ref: "source hash/a7800.xml:24-38"
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note: >-
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Software list set for the XM Expansion Module configuration (slot
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a78_xm), which reuses the High Score Cartridge ROM alongside 128KB RAM,
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POKEY and YM2151. Fatal when that configuration is selected and the set
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is absent.
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contents:
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- name: highscre.bin
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description: High Score Cartridge ROM, gated by XM control register bit 3
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size: 4096
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crc32: "9be408d3"
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sha1: "a3af676991391a6dd716c79022d4947206b78164"
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