zanacandClaude Opus 5.5 273f904d7d Sega ST-V: driver, VDP1/VDP2 video and SCU from current MAME, optional SH-2 recompiler and threaded video (#2124) ...

- Driver, SCU (DMA, interrupts, timers, DSP), SMPC, MINIT/SINIT, EEPROM
  and the protection chips as current MAME; the current MAME sets.
- VDP1/VDP2 video as current MAME's (one stvvid.c), with exact speedups:
  partial redraw of the rotation plane cache, rotation copy, sprite
  passes, window evaluation once per line.
- SH-2 recompiler on the bundled sljit (x86, x86-64, ARM32, ARM64; the
  "SH-2 Dynarec" core option, off by default): blocks with chaining,
  page tables for direct memory access, memory handlers called from the
  blocks; the SGL idle loop is skipped exactly; context switch by
  pointer. Same output as the interpreter on all the sets.
- "ST-V Threaded Video" core option (off by default): the screen drawn
  in strips by 2-4 threads (libretro-common rthreads, where thread-local
  storage is native), same output.

Two more sets of Zen Nippon Pro-Wrestling Featuring Virtua, both on the
Taiwan BIOS (the core selects it):
- znpwfvt: All Japan Pro-Wrestling Featuring Virtua (Taiwan), as in
  current MAME.
- znpwfve: English translation (bootleg) on the Taiwan program, with the
  graphics the English mode left in Japanese redrawn; the ROMs are built
  from the original ones by https://github.com/zanac/znpwfvt


Claude-Session: https://claude.ai/code/session_013Vje3pEtpLHubqCGwCgoQX

Co-authored-by: Claude Opus 5.5 <[email protected]>

2026-10-30 21:57:04 -04:00

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