Routines
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DC60: Walk, or come to a stop on the grid
Used by the routine at UPDATE_KNIGHT.
With the walk control (bit 2 of E, after TURN_KNIGHT) he walks on (WALK_ON). Without it he does not stop dead: COAST_TABLE's routine for his facing keeps him stepping until his place along it is a multiple of 8, so he always comes to rest on an eight-unit grid.
Input
E The controls
KNIGHT_WALKS DC60 BIT 2,E Walking?
DC62 JR NZ,WALK_ON
DC64 LD A,(IX+$06) No: come to a stop, by the facing
DC67 RLCA
DC68 RLCA
DC69 AND $03
DC6B LD BC,COAST_TABLE
DC6E JP DISPATCH
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