Routines |
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On entry the HL register pair points to the location under consideration. If the location holds a value that constitutes a suitable high byte for a line number then the line number is returned in DE. However if this is not so then the location addressed by DE is tried instead; and should this also be unsuccessful line number zero is returned.
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LINE_ZERO | 05775 | DEFB 0,0 | Line number zero. | |||||||||||
LINE_NO_A | 05777 | EX DE,HL | Consider the other pointer. | |||||||||||
05778 | LD DE,5775 | Use line number zero. | ||||||||||||
The main entry point is here, and is used by the routines at ED_EDIT, ED_UP and LN_FETCH.
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LINE_NO | 05781 | LD A,(HL) | Fetch the high byte and test it. | |||||||||||
05782 | AND 192 | |||||||||||||
05784 | JR NZ,LINE_NO_A | Jump if not suitable. | ||||||||||||
05786 | LD D,(HL) | Fetch the high byte and low byte and return. | ||||||||||||
05787 | INC HL | |||||||||||||
05788 | LD E,(HL) | |||||||||||||
05789 | RET |
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