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Routines |
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Code nothing reaches: no instruction or table holds its address, and no session ran it. sna2ctl left it as data; it decodes cleanly to its RET. It is Knight Lore's sound_transform byte for byte (found by searching Knight Lore's snapshot for these bytes): a warble of 16 to 40 single waves, the number set by the low two bits of the graphic -- the four frames of Sabreman changing into the werewolf and back -- each at a half-wave count of the step XOR $55, plus the step. Alien 8 kept the routine and dropped its only caller.
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| TRANSFORM_SOUND | B65F | LD A,(IX+$00) | C = 16, 24, 32 or 40 by the graphic's bits 0-1; one wave at (C XOR $55) + C for each C down to 1 | |||||
| B662 | RLCA | |||||||
| B663 | RLCA | |||||||
| B664 | RLCA | |||||||
| B665 | AND $18 | |||||||
| B667 | ADD A,$10 | |||||||
| B669 | LD C,A | |||||||
| TRANSFORM_SOUND_0 | B66A | LD A,C | ||||||
| B66B | XOR $55 | |||||||
| B66D | ADD A,C | |||||||
| B66E | LD B,A | |||||||
| B66F | CALL CLICK | |||||||
| B672 | DEC C | |||||||
| B673 | JR NZ,TRANSFORM_SOUND_0 | |||||||
| B675 | RET | |||||||
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