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Routines |
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Used by the routines at ScrollViewDown and ScrollViewUp.
Moves the view by adding a value to 5CE4 and subtracting it from ViewOriginDifference and ViewPosition.
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| MoveView | B8F9 | LD HL,($5CE4) | Fetch the word at 5CE4 into HL. | |||||
| B8FC | ADD HL,DE | HL takes DE. | ||||||
| B8FD | LD ($5CE4),HL | Write HL at 5CE4. | ||||||
| B900 | LD HL,($5CEE) | Fetch the word at ViewOriginDifference into HL. | ||||||
| B903 | AND A | See whether A is zero. | ||||||
| B904 | SBC HL,DE | Subtract DE from HL. (with the carry) | ||||||
| B906 | LD ($5CEE),HL | Write HL at ViewOriginDifference. | ||||||
| B909 | LD HL,($5CE2) | Fetch the word at ViewPosition into HL. | ||||||
| B90C | AND A | See whether A is zero. | ||||||
| B90D | SBC HL,DE | Subtract DE from HL. (with the carry) | ||||||
| B90F | LD ($5CE2),HL | Write HL at ViewPosition. | ||||||
| B912 | RET | Return. | ||||||
| Prev: B8E2 | Up: Map | Next: B913 |