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Routines |
| Prev: F100 | Up: Map | Next: F15E |
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Used by the routine at F000. Periodically checks whether any open doors need closing, and closes them.
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| F144 | LD A,(HL) | Collect the current value of the main loop task timer from 7FA9 | ||||||
| F145 | AND $0F | Is it time to close any currently open doors? | ||||||
| F147 | RET NZ | Return if not | ||||||
| F148 | LD L,$FA | HL will be used to index the door status flags at 7FF0 | ||||||
| F14A | DEC L | Point HL at the status flags for the next door | ||||||
| F14B | BIT 4,L | Have we checked every door yet? | ||||||
| F14D | RET Z | Return if so | ||||||
| F14E | LD A,(HL) | Pick up the status flags for this door | ||||||
| F14F | AND $07 | Is the door currently closed? | ||||||
| F151 | JR Z,$F14A | If so, jump back to check the next door | ||||||
| F153 | DEC (HL) | Decrement the door close delay timer in bits 0-2 of the status flags | ||||||
| F154 | DEC A | Is it time to close the door? | ||||||
| F155 | JR NZ,$F14A | If not, jump back to check the next door | ||||||
| F157 | PUSH HL | Save the door status flags pointer | ||||||
| F158 | CALL $F100 | Close the door and update the screen refresh buffer | ||||||
| F15B | POP HL | Restore the door status flags pointer to HL | ||||||
| F15C | JR $F14A | Jump back to check the next door | ||||||
| Prev: F100 | Up: Map | Next: F15E |