Routines
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31626: DrawNextCorridorTile
Reads the next tile index from the corridor position pointer at 31261, draws it by falling through into DrawSprite, and advances the pointer.
Used by the routines at 31417, 31577, 32816, 35290 and 35638.
31626 LD HL,(31261) HL = corridor tile-source pointer (31261)
31629 LD A,(HL) A = next tile index
31630 INC HL advance pointer
31631 LD (31261),HL save updated pointer; fall through to DrawSprite
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