|
Routines |
| Prev: B6DB | Up: Map | Next: B6EF |
|
The first instruction's displacement is patched by shuttle_block to read X or Y. Adding 8 is because a block built on a cell's centre line sits at 8 past a multiple of 16, so this is its distance along its span.
|
||||
| shuttle_block_step | B6DE | LD A,(IX+$01) | the position: IX+1 or IX+2, patched | |
| B6E1 | ADD A,$08 | where in its span it is now; is that the target? | ||
| B6E3 | AND $0F | |||
| B6E5 | CP C | |||
| B6E6 | JP Z,set_wipe_and_draw_flags | yes: stand still this frame, but redraw | ||
| B6E9 | LD A,$01 | no: +1 if short of it, -1 if past it | ||
| B6EB | JR C,shuttle_block_move | |||
| B6ED | NEG | |||
| Prev: B6DB | Up: Map | Next: B6EF |