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Routines |
Prev: 59405 | Up: Map |
Used by the routine at 61882.
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59406 | LD HL,59372 | Set the instruction at 59371 to 'LD BC,31' | ||||||
59409 | LD (HL),31 | |||||||
59411 | LD L,239 | Set the instruction at 59374 to 'LDIR' | ||||||
59413 | LD (HL),176 | |||||||
59415 | LD B,8 | There are 8 columns to scroll on | ||||||
59417 | PUSH BC | Save the column counter | ||||||
59418 | LD B,20 | There are 20 rows to be scrolled left | ||||||
59420 | LD HL,22529 | Point HL at the attribute byte for the cell at screen coordinates (1,0) | ||||||
59423 | LD D,H | Point DE at the attribute byte for the adjacent cell on the left | ||||||
59424 | LD E,L | |||||||
59425 | DEC E | |||||||
59426 | PUSH BC | Save the row counter | ||||||
59427 | PUSH HL | Save the source attribute file address | ||||||
59428 | CALL 59368 | Shift this row of the screen left | ||||||
59431 | POP HL | Restore the source attribute file address to HL | ||||||
59432 | LD C,32 | Point HL at the next row down in the attribute file | ||||||
59434 | ADD HL,BC | |||||||
59435 | POP BC | Restore the row counter to B | ||||||
59436 | DJNZ 59423 | Jump back until all 20 rows have been scrolled left | ||||||
59438 | LD HL,32766 | 32766 holds the x-coordinate of the leftmost column of the play area on screen | ||||||
59441 | INC (HL) | Increment this x-coordinate | ||||||
59442 | LD HL,4895 | L=31 (rightmost screen column), H=19 (bottom row of the screen) | ||||||
59445 | PUSH HL | Save the screen coordinates | ||||||
59446 | CALL 59148 | Print a tile at screen coordinates (31,H) | ||||||
59449 | POP HL | Restore the screen coordinates to HL | ||||||
59450 | DEC H | Have we printed every tile in the column yet? | ||||||
59451 | JP P,59445 | Jump back if not | ||||||
59454 | POP BC | Restore the column counter to B | ||||||
59455 | DJNZ 59417 | Jump back until 8 columns have been scrolled on | ||||||
59457 | RET |
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