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Routines |
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The address of this routine is derived from an offset found in the control character table.
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| PO_BACK_1 | 0A23 | INC C | Move leftwards by one column. | |||||||
| 0A24 | LD A,$22 | Accept the change unless up against the lefthand side. | ||||||||
| 0A26 | CP C | |||||||||
| 0A27 | JR NZ,PO_BACK_3 | |||||||||
| 0A29 | BIT 1,(IY+$01) | If dealing with the printer (bit 1 of FLAGS set) jump forward. | ||||||||
| 0A2D | JR NZ,PO_BACK_2 | |||||||||
| 0A2F | INC B | Go up one line. | ||||||||
| 0A30 | LD C,$02 | Set column value. | ||||||||
| 0A32 | LD A,$18 | Test against top line. Note: this ought to be +19. | ||||||||
| 0A34 | CP B | |||||||||
| 0A35 | JR NZ,PO_BACK_3 | Accept the change unless at the top of the screen. | ||||||||
| 0A37 | DEC B | Unacceptable so down a line. | ||||||||
| PO_BACK_2 | 0A38 | LD C,$21 | Set to lefthand column. | |||||||
| PO_BACK_3 | 0A3A | JP CL_SET | Make an indirect return via CL_SET and PO_STORE. | |||||||
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