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Routines |
Prev: 61838 | Up: Map | Next: 61923 |
61882 | LD A,(32766) | 32766 holds X, the x-coordinate of the leftmost column of the play area on screen |
61885 | SUB 56 | A=0, 8, 16, 24, 32, 40 or 48 (depending on the value of X) |
61887 | JR NC,61885 | |
61889 | ADD A,56 | |
61891 | RRCA | A=215-221 |
61892 | RRCA | |
61893 | RRCA | |
61894 | ADD A,215 | |
61896 | LD H,A | Point HL at the first byte of the first buffer in the group |
61897 | LD L,0 | |
61899 | LD DE,32608 | Copy the first buffer in the group (buffer 1) to 32608 temporarily |
61902 | LD BC,25 | |
61905 | LDIR | |
61907 | LD E,B | Point DE at the first byte of the first buffer in the group |
61908 | LD D,H | |
61909 | LD C,100 | Move buffers 2-5 down into slots 1-4 (thus overwriting buffer 1) |
61911 | LDIR | |
61913 | LD HL,32608 | Copy buffer 1 from its temporary storage location into slot 5 |
61916 | LD C,25 | |
61918 | LDIR | |
61920 | JP 59406 | Scroll the screen left 8 columns (the routine at 30822 replaces this instruction with a RET) |
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