Routines |
Prev: 1664 | Up: Map | Next: 169E |
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.
|
||||||||||||||
LINE_ZERO | 168F | DEFB $00,$00 | Line number zero. | |||||||||||
LINE_NO_A | 1691 | EX DE,HL | Consider the other pointer. | |||||||||||
1692 | LD DE,$168F | Use line number zero. | ||||||||||||
The main entry point is here, and is used by the routines at ED_EDIT, ED_UP and LN_FETCH.
|
||||||||||||||
LINE_NO | 1695 | LD A,(HL) | Fetch the high byte and test it. | |||||||||||
1696 | AND $C0 | |||||||||||||
1698 | JR NZ,LINE_NO_A | Jump if not suitable. | ||||||||||||
169A | LD D,(HL) | Fetch the high byte and low byte and return. | ||||||||||||
169B | INC HL | |||||||||||||
169C | LD E,(HL) | |||||||||||||
169D | RET |
Prev: 1664 | Up: Map | Next: 169E |