VanniandClaude Opus 5.5
93b073496c
SCSP (also used by Model 2): - The slot engine from current MAME: key off goes to the release, the envelope tables and the dB curve of the decay, pitch, interpolation, the four loop modes, FM from the ring buffer, noise (SSCTL), SBCTL, LPSLNK, STWINH/SDIR; 8-bit samples read in big-endian byte order. - The monitor register 0x408 returns CA, SGC and EG of the slot set in MSLC: the sound drivers look there for a free slot, and Winter Heat played every voice on slot 0, each one cutting the previous. - Real timers for timers A, B and C, as in MAME: counting them with the generated samples delayed every interrupt until the next stream update. - Interrupts as in MAME: each source raises its own level until it is acknowledged in SCIRE, and an acknowledged expired timer is pending again with no new interrupt. Reading MIBUF drops the MIDI interrupt: left raised, the sound CPU took it again on an empty FIFO and read stale bytes as MIDI data, which broke music commands in Model 2 (Fighting Vipers, Dead or Alive, Manx TT). - The DMA used the common registers 0x412 words past them, inside the slots: now as in MAME. - The common registers are 0x400-0x42f only (0x500 is not a mirror), the ring buffer at 0x600 can be read and written, the LFO saw wave and rate as in MAME. - ST-V: a 16-bit access of the SH-2 touches only its half of the SCSP registers. Batman Forever: the Acclaim RAX sound board (ADSP-2181), moved from zn.c to sndhrdw/acclaim_rax.c and shared by NBA Jam Extreme and Batman Forever, which writes its commands to 0x04800000 as in MAME. docs/sega-model2.md: the MIDI interrupt of the sound link. Fixes #2194. Co-Authored-By: Claude Opus 5.5 <[email protected]> Claude-Session: https://claude.ai/code/session_013Vje3pEtpLHubqCGwCgoQX
What is MAME 2003-Plus?
MAME 2003-Plus (also referred to as MAME 2003+ and mame2003-plus) is a libretro arcade system emulator core with an emphasis on high performance and broad compatibility with mobile devices, single board computers, embedded systems, and similar platforms.
In order to take advantage of the performance and lower hardware requirements of an earlier MAME architecture, MAME 2003-Plus began with the MAME 2003 codebase which is itself derived from xmame 0.78. Upon that base, MAME 2003-Plus contributors have backported support for an additional 350 games, as well as other functionality not originally present in the underlying codebase.
What games are supported?
View our live compatibility table built using datmagic, a tool created by the MAME 2003-Plus team. Datmagic auto-generates a compatibility table based on the latest XML DAT file. See an incorrect entry? Create a new issue to let us know! This allows us to keep the compatibility table as accurate as possible by fixing it at the source.
Authors: MAMEdev, MAME 2003-Plus team, et al (see LICENSE.md and CHANGELOG.md)
Documentation
User documentation for MAME 2003-Plus can be found in the libretro core documentation library.
Developer documentation can be found in the MAME 2003-Plus wiki.
Development chat
#programming channel of the libretro discord chat server.
Romsets and how to build them for this core
mame2003-plus was originally built from the MAME 0.78 codebase, meaning that 95% or more of MAME 0.78 romsets will work as-is in mame2003-plus, where they immediately benefit from its bugfixes and other improvements. In order to play the new games and games which received ROM updates in mame2003-plus, you will need to find or build the correct romsets.
Read more about rebuilding romsets in the libretro core documentation for mame2003-plus.