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Black Crypt — Data Formats

bcdfu — RLE & Epilogue

bcdfu — RLE & Epilogue

Section titled “bcdfu — RLE & Epilogue”

bcdfu (141,388 bytes) is a HUNK overlay that wears several hats:

  • It carries the shared RLE decompressor (LAB_0043) used by bcdfv, bcdfx, bcdfy and bcdfz.
  • It holds the sound (8SVX samples) and music (OctaMED modules).
  • Its CODE hunk 0 is a complete standalone program: the endgame/epilogue sequence player — 10 narrative screens + credits, then RTS. It opens bcdfv for the sequence data.
  • It carries 5 palettes at file 0x03EC–0x04EC — copies of entries 0–4 of the real 12-entry dungeon ramp table in bcdft.

The RLE algorithm (LAB_0043)

Section titled “The RLE algorithm (LAB_0043)”

This is the shared decompression scheme used across the game’s RLE files:

ctrl byte 0x00 = end of stream
bit0 = 1:  literal copy — copy (byte >> 1) bytes from source
bit0 = 0:  fill — repeat the next byte (byte >> 1) times

Sound & music

Section titled “Sound & music”

bcdfu embeds IFF 8SVX chunks (without a containing FORM wrapper) and three OctaMED MMD0 tracker modules. See 8SVX samples and OctaMED modules.

The epilogue player

Section titled “The epilogue player”

bcdfu’s own strings (“THROUGH INCREDIBLE BRAVERY…”) identify it as the epilogue player. It reads the 16-block sequence data from bcdfv and displays the narrated ending. See bcdfv.