|
Routines |
| Prev: 61913 | Up: Map | Next: 62054 |
| 62003 | LD DE,25048 | Point DE at table of background attribute data | ||
| 62006 | LD A,(24841) | Load A with Magic Knight's current y-coordinate (pixels) | ||
| 62009 | AND 248 | Clear lowest three bits to round down to nearest multiple of 8 | ||
| 62011 | LD L,A | Load this value into HL... | ||
| 62012 | LD H,0 | ... | ||
| 62014 | ADD HL,HL | Multiply by four to obtain 32 × y-coordinate (characters)... | ||
| 62015 | ADD HL,HL | ... | ||
| 62016 | LD A,(24840) | Load A with Magic Knight's current x-coordinate (pixels) | ||
| 62019 | RRCA | Divide this by eight, rounding down to nearest integer... | ||
| 62020 | RRCA | ...to convert from pixels to characters... | ||
| 62021 | RRCA | ... | ||
| 62022 | AND 31 | ... | ||
| 62024 | LD C,A | Load x-coordinate (characters) into BC... | ||
| 62025 | LD B,0 | ... | ||
| 62027 | ADD HL,BC | Add x-coordinate to 32 × y-coordinate in HL... | ||
| 62028 | LD BC,22528 | ...then add this to start address of attribute file... | ||
| 62031 | ADD HL,BC | ...so that HL points to required byte in attribute file | ||
| 62032 | LD B,4 | Load B with 4 as Magic Knight is four characters tall | ||
| 62034 | PUSH BC | Store BC (B = remaining number of character rows) | ||
| 62035 | LD A,(DE) | Copy byte from table of background attribute data... | ||
| 62036 | LD (HL),A | ...into attribute file | ||
| 62037 | INC HL | Advance current position in attribute file | ||
| 62038 | INC DE | Advance current position in table of background attribute data | ||
| 62039 | LD A,(DE) | Copy byte from table of background attribute data... | ||
| 62040 | LD (HL),A | ...into attribute file | ||
| 62041 | INC HL | Advance current position in attribute file | ||
| 62042 | INC DE | Advance current position in table of background attribute data | ||
| 62043 | LD A,(DE) | Copy byte from table of background attribute data... | ||
| 62044 | LD (HL),A | ...into attribute file | ||
| 62045 | INC DE | Advance current position in table of background attribute data | ||
| 62046 | LD BC,30 | Advance current position in attribute file by 30 bytes... | ||
| 62049 | ADD HL,BC | ...i.e. down one character and left two characters | ||
| 62050 | POP BC | Restore BC (B = remaining number of character rows) | ||
| 62051 | DJNZ 62034 | If character rows to be coloured remain then loop back to 62034 | ||
| 62053 | RET | Return | ||
| Prev: 61913 | Up: Map | Next: 62054 |