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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 23780 and subtracting it from ViewOriginDifference and ViewPosition.
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| MoveView | 47353 | LD HL,(23780) | Fetch the word at 23780 into HL. | |||||
| 47356 | ADD HL,DE | HL takes DE. | ||||||
| 47357 | LD (23780),HL | Write HL at 23780. | ||||||
| 47360 | LD HL,(23790) | Fetch the word at ViewOriginDifference into HL. | ||||||
| 47363 | AND A | See whether A is zero. | ||||||
| 47364 | SBC HL,DE | Subtract DE from HL. (with the carry) | ||||||
| 47366 | LD (23790),HL | Write HL at ViewOriginDifference. | ||||||
| 47369 | LD HL,(23778) | Fetch the word at ViewPosition into HL. | ||||||
| 47372 | AND A | See whether A is zero. | ||||||
| 47373 | SBC HL,DE | Subtract DE from HL. (with the carry) | ||||||
| 47375 | LD (23778),HL | Write HL at ViewPosition. | ||||||
| 47378 | RET | Return. | ||||||
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