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Routines |
| Prev: 79CA | Up: Map | Next: 79FD |
| 79D4 | CALL $79FD | Get ERIC's coordinates in DE | ||
| 79D7 | LD A,D | A=ERIC's y-coordinate | ||
| 79D8 | PUSH HL | |||
| 79D9 | LD HL,$7790 | Point HL at the skool region table for the top floor (see 77AC) | ||
| 79DC | CP $9B | Is ERIC on the top floor? | ||
| 79DE | JR Z,$79EE | Jump if so | ||
| 79E0 | CP $A2 | Set the zero flag if ERIC's on the middle floor | ||
| 79E2 | LD L,$9C | HL=779C (skool region data table for the middle floor; see 77AC) | ||
| 79E4 | JR Z,$79EE | Jump if ERIC's on the middle floor | ||
| 79E6 | LD L,$A6 | HL=77A6 (skool region data table for the bottom floor; see 77AC) | ||
| 79E8 | CP $A9 | Is ERIC on the bottom floor? | ||
| 79EA | JR Z,$79EE | Jump if so | ||
| 79EC | POP HL | |||
| 79ED | RET | Return with the zero flag reset | ||
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ERIC is on the top, middle or bottom floor (i.e. not on a staircase).
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| 79EE | LD A,E | A=ERIC's x-coordinate | ||
| 79EF | CP (HL) | Find the region identifier (0-7) for ERIC's current location | ||
| 79F0 | INC HL | |||
| 79F1 | INC HL | |||
| 79F2 | JR NC,$79EF | |||
| 79F4 | DEC HL | HL now points at the region identifier | ||
| 79F5 | LD A,($7FF4) | Pick up the current lesson descriptor from 7FF4 | ||
| 79F8 | AND $07 | Keep only the room bits (bits 0-2) | ||
| 79FA | CP (HL) | Is ERIC where he should be? | ||
| 79FB | POP HL | |||
| 79FC | RET | Return with the zero flag set if so | ||
| Prev: 79CA | Up: Map | Next: 79FD |