Routines
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917D: A timed door, shut (types $20 and $22)
Made by CHOOSE_TIMED_DOORS; reached through ACTOR_HANDLERS entries $C2 and $C4 for types $20 and $22. On passes where TICKS is even it counts the shared DOOR_WAIT ($5E2E) down; the door that finds it at zero runs TOGGLE_TIMED_DOOR, which opens it. Otherwise it only draws itself.
TIMED_DOOR_SHUT 917D LD A,($5E12)
9180 AND $01
9182 JP NZ,DRAW_DOOR
9185 LD A,($5E2E)
9188 AND A
9189 JP Z,TOGGLE_TIMED_DOOR
918C DEC A
918D LD ($5E2E),A
9190 JP DRAW_DOOR
This entry point is used by the routine at TIMED_DOOR_OPEN.
TOGGLE_TIMED_DOOR 9193 LD A,$5E TOGGLE_TIMED_DOOR: reload the shared countdown, then swap this door between shut and open on both halves and rasp.
9195 LD ($5E2E),A
9198 LD A,(IX+$05)
919B PUSH AF
919C OR $03
919E LD (IX+$05),A
91A1 CALL DRAW_RECORD
91A4 LD A,(IX+$00)
91A7 XOR $01
91A9 CALL SET_BOTH_HALVES
91AC CALL DRAW_RECORD
91AF POP AF
91B0 LD (IX+$05),A
91B3 CALL DOOR_OPEN_OR_SHUT
91B6 CALL DRAW_DOOR
91B9 JP SOUND_NOISE_BURST
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