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Routines |
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Used by the routine at HandleBackspaceKey.
Steps the print column back by one cell and wraps when the column underflows.
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| SubtractSeven | C267 | LD A,C | Read the low byte of the count. | |
| C268 | SUB $07 | Step back one character cell, wrapping to the previous row when the column underflows. | ||
| C26A | LD C,A | Store the result in the low byte of the count. | ||
| C26B | RET NC | Return when the column still fits on this row. | ||
| C26C | DEC L | Count down the low byte of the pointer. | ||
| C26D | ADD A,$08 | Advance the result by 08. | ||
| C26F | LD C,A | Store the column. | ||
| C270 | RET | Return. | ||
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View the equivalent code in;
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| Prev: C249 | Up: Map | Next: C271 |