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Routines |
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As EXIT_LOW_U the other way: out if the near edge after the move -- U plus the step less the half-size -- is at or past the wall at 128 plus the room's U half-size. U becomes the marker $FF, to arrive at the wall at low U, and the room is the next in the row.
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| EXIT_HIGH_U | C3F0 | POP HL | L = the wall | |||||||
| C3F1 | LD A,L | |||||||||
| C3F2 | ADD A,$80 | |||||||||
| C3F4 | LD L,A | |||||||||
| C3F5 | LD A,(IX+$01) | U + dU - half-size short of it: stay | ||||||||
| C3F8 | ADD A,(IX+$09) | |||||||||
| C3FB | SUB (IX+$04) | |||||||||
| C3FE | CP L | |||||||||
| C3FF | RET C | |||||||||
| C400 | LD (IX+$01),$FF | Arrive at the wall at low U | ||||||||
| C404 | LD A,(IX+$08) | Room + 1, within the row | ||||||||
| C407 | LD L,A | |||||||||
| C408 | INC A | |||||||||
| C409 | JR EXIT_WITHIN_ROW | |||||||||
| Prev: C397 | Up: Map | Next: C40B |