Routines
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83B0: Gather the cells in view into VIEW_CELLS
Used by the routine at DRAW_VIEW.
Jumps to one of four routines, 32 bytes apart from GATHER_VIEW0, which read the map along diagonals in the order that view needs: 21 rows of two 16-cell half-rows, from VIEW_ORIGIN.
GATHER_VIEW 83B0 LD A,(VIEW) HL = GATHER_VIEW0 + 32 x the view.
83B3 AND $03
83B5 RRCA
83B6 RRCA
83B7 RRCA
83B8 OR $81
83BA LD L,A
83BB LD H,$86
83BD LD DE,(VIEW_ORIGIN)
83C1 LD IX,VIEW_CELLS
83C5 LD A,$15 21 rows.
83C7 JP (HL)
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