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DISC.md

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Disc identity — Mega Man X4 (USA)

Format: bin/cue, single track, MODE2/2352, NTSC-U. Do not convert to ISO — a 2048-byte "cooked" ISO discards the Mode-2 Form-2 XA sectors PSX uses for streaming FMV/audio (X4 streams STR/.STR MDEC movies + XA/.XA BGM/voice).

Field Value
Title Mega Man X4 (USA)
Serial SLUS-00561 (file SLUS_005.61)
Volume ID MEGAMAN_X4
Publisher CAPCOM CO.,LTD.
Track 01, MODE2/2352, data
Size (.bin) 592,217,136 bytes
MD5 1C425B49BB25C45B3964B2D565DD0EC0
SHA-1 26FFE24A79384B24AF7571674251EE575E889B38

Verified 2026-07-05: locally computed MD5 + SHA-1 + .bin size + serial. Source archive Mega Man X4.7z (kept bin/cue; never converted to ISO).

Boot EXE: SLUS_005.61 — PS-EXE header (little-endian):

  • entry (pc0): 0x800DAE8C
  • initial $gp: 0x00000000 (not preset — X4 sets $gp at runtime, as in X5/X6)
  • load address: 0x80010000
  • text size: 0x0011F800 (1,177,600 bytes) → end of text 0x8012F800
  • data/bss: addr 0, size 0 (all zero in header)
  • initial $sp: 0x801FFFF0 (PS-EXE header stack_base; SYSTEM.CNF STACK = 801FFF00)
  • EXE file size: 1,179,648 = 2048-byte header + text

On-disc layout of note:

  • SLUS_005.61 — boot EXE (the static recomp target)
  • ARC/*.ARC — 130 typed asset containers (612 members) and eight raw text-pattern, sequence and replay files. The original-disc inspection found no separate executable game overlay; see loader evidence and limits.
  • STR/*.STR — MDEC movies (CAPCOM20.STR, OP_U.STR, X1_U..X4_U.STR, Z1_U..Z5_U.STR)
  • XA/*.XA — streamed audio (BGM1_U..BGM5_U.XA, BOSINT_U.XA, VOICE1_U..VOICE5_U.XA)
  • ZNULL.DAT — 37 MB null-padding file (disc layout filler)

Disc image and extracted EXE are local-only (gitignored); recreate from the source dump if missing.