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Routines |
| Prev: 60521 | Up: Map | Next: 60624 |
| 60539 | CALL 60521 | Make a sound effect | ||
| 60542 | LD H,230 | 230=Sam | ||
| 60544 | CALL 60506 | Move Sam from the midstride or mid-action position and update the SRB | ||
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This entry point is used by the routines at 25789, 31476 and 64338.
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| 60547 | LD DE,32766 | 32766 holds X, the x-coordinate of the leftmost column of the play area on screen | ||
| 60550 | LD L,1 | Point HL at byte 1 of Sam's buffer | ||
| 60552 | LD A,(DE) | A=X | ||
| 60553 | SUB (HL) | Subtract Sam's x-coordinate | ||
| 60554 | JR Z,60560 | Jump if they are equal | ||
| 60556 | CP 247 | Is Sam's x-coordinate >= X+10? | ||
| 60558 | JR C,60572 | Jump if so (no need to scroll right) | ||
| 60560 | LD A,(DE) | A=X | ||
| 60561 | AND A | Is X=0? | ||
| 60562 | JR Z,60587 | Jump if so (no need to scroll right) | ||
| 60564 | CALL 60032 | Update the display | ||
| 60567 | CALL 61838 | Cycle a character buffer group forwards and scroll the screen right | ||
| 60570 | JR 60587 | |||
| 60572 | CP 235 | Is Sam's x-coordinate <= X+21? | ||
| 60574 | JR NC,60587 | Jump if so (no need to scroll left) | ||
| 60576 | LD A,(DE) | A=X | ||
| 60577 | CP 224 | Is X=224? | ||
| 60579 | JR Z,60587 | Jump if so (no need to scroll left) | ||
| 60581 | CALL 60032 | Update the display | ||
| 60584 | CALL 61882 | Cycle a character buffer group backwards and scroll the screen left | ||
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Now that any required horizontal scrolling has been done, it's time to check whether any vertical scrolling is required.
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| 60587 | LD DE,32767 | 32767 holds Y, the y-coordinate of the topmost row of the play area on screen | ||
| 60590 | LD HL,58882 | Point HL at byte 2 of Sam's buffer | ||
| 60593 | LD A,(DE) | A=Y-3 | ||
| 60594 | SUB 3 | |||
| 60596 | SUB (HL) | Subtract Sam's y-coordinate | ||
| 60597 | CP 252 | Is Sam's y-coordinate >= Y+2? | ||
| 60599 | JR C,60611 | Jump if so (no need to scroll down) | ||
| 60601 | LD A,(DE) | A=Y | ||
| 60602 | CP 2 | Is Y=2? | ||
| 60604 | RET Z | Return if so (no need to scroll down) | ||
| 60605 | CALL 60032 | Update the display | ||
| 60608 | JP 59575 | Scroll the screen down | ||
| 60611 | CP 240 | Is Sam's y-coordinate <= Y+13? | ||
| 60613 | RET NC | Return if so (no need to scroll up) | ||
| 60614 | LD A,(DE) | A=Y | ||
| 60615 | CP 20 | Is Y=20? | ||
| 60617 | RET Z | Return if so (no need to scroll up) | ||
| 60618 | CALL 60032 | Update the display | ||
| 60621 | JP 59516 | Scroll the screen up | ||
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