|
Routines |
| Prev: B1C7 | Up: Map | Next: B1F5 |
|
This locates the current door, queuing a message if it's locked.
Used by the routines at door_handling and door_handling_interior.
|
||||||||
| is_door_locked | B1D4 | LD E,$7F | Set E to the complement of door_REVERSE ($7F) | |||||
| B1D6 | LD A,($68A1) | Fetch the current door [index] | ||||||
| B1D9 | AND E | Mask it off | ||||||
| B1DA | LD C,A | Move it to C | ||||||
|
Check all locked doors
|
||||||||
| B1DB | LD HL,$F05D | Point HL at first locked doors | ||||||
| B1DE | LD B,$09 | 9 iterations / 9 locked doors | ||||||
|
Start loop
|
||||||||
| is_door_locked_0 | B1E0 | LD A,(HL) | Fetch a door index | |||||
| B1E1 | AND E | Mask off the locked flag | ||||||
| B1E2 | CP C | Does it match the current door? | ||||||
| B1E3 | JR NZ,is_door_locked_1 | Jump forward if not | ||||||
| B1E5 | BIT 7,(HL) | Test the door_LOCKED flag | ||||||
| B1E7 | RET Z | Return if the flag was zero: the door is open | ||||||
|
Otherwise the door is locked
|
||||||||
| B1E8 | LD B,$05 | Queue the message "THE DOOR IS LOCKED" | ||||||
| B1EA | CALL queue_message | |||||||
| B1ED | OR $01 | Set flags to NZ - the door is locked | ||||||
| B1EF | RET | Return | ||||||
| is_door_locked_1 | B1F0 | INC HL | Advance to the next locked door | |||||
| B1F1 | DJNZ is_door_locked_0 | ...loop | ||||||
| B1F3 | AND B | Set flags to Z - the door is open | ||||||
| B1F4 | RET | Return | ||||||
| Prev: B1C7 | Up: Map | Next: B1F5 |