Routines
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D5F6: The width of the area, and its bottom edge
Used by the routine at wipe_right_edge.
wipe_width D5F6 LD A,C H = the width in bytes, from the left byte to the right edge
D5F7 RRCA
D5F8 RRCA
D5F9 RRCA
D5FA AND $1F
D5FC LD B,A
D5FD LD A,E
D5FE SUB B
D5FF LD H,A
D600 LD A,(IX+$1B) B = the lower of the new (byte $1B) and old (byte $1F) pixel y
D603 SUB (IX+$1F)
D606 JR C,wipe_bottom_is_new
D608 LD B,(IX+$1F)
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