|
Routines |
| Prev: 50586 | Up: Map | Next: 50758 |
|
Works out how much of a span is in view. Purpose not yet known.
|
||||
| ClipSpan | 50729 | LD H,0 | H is 0. | |
| 50731 | LD A,L | L moves into A. | ||
| 50732 | SUB E | Subtract E. | ||
| 50733 | JR C,ClipSpan_Skip | Jump to 50747 if the carry flag is set. | ||
| 50735 | LD H,A | A moves into H. | ||
| 50736 | SUB B | Subtract B. | ||
| 50737 | RET NC | Return if the carry flag is reset. | ||
| 50738 | LD L,E | E moves into L. | ||
| 50739 | NEG | Negate A. | ||
| 50741 | LD B,A | A moves into B. | ||
| 50742 | CP C | Compare A with C. | ||
| 50743 | RET C | Return if the carry flag is set. | ||
| 50744 | LD B,C | C moves into B. | ||
| ClipSpan_Loop | 50745 | SCF | Set the carry flag. | |
| 50746 | RET | Return. | ||
| ClipSpan_Skip | 50747 | ADD A,C | Plus C. | |
| 50748 | RET NC | Return if the carry flag is reset. | ||
| 50749 | JR Z,ClipSpan_Skip2 | Jump to 50756 if the zero flag is set. | ||
| 50751 | CP B | Compare A with B. | ||
| 50752 | JR NC,ClipSpan_Loop | Jump to 50745 if the carry flag is reset. | ||
| 50754 | LD B,A | A moves into B. | ||
| 50755 | RET | Return. | ||
| ClipSpan_Skip2 | 50756 | XOR A | Set A to zero. | |
| 50757 | RET | Return. | ||
| Prev: 50586 | Up: Map | Next: 50758 |