Routines
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C889: Colour a strip two cells wide in the play area's attributes
Used by the routine at COLOUR_WALL.
Writes the colour, with the play area's paper this turn (LAST_FLASH) mixed in, into two neighbouring cells of each of B rows of the attribute buffer, 24 bytes a row. COLOUR_WALL colours the buildings' walls with it; running a strip down to the bottom row of the buffer writes one byte beyond it (ATTR_SPILL).
Input
A the colour
HL the first cell in the attribute buffer (ATTR_BUFFER)
B how many rows
COLOUR_STRIP C889 LD E,A the colour with this turn's paper
C88A LD A,(LAST_FLASH)
C88D OR E
C88E LD DE,$0017 two cells a row, B rows
COLOUR_STRIP_0 C891 LD (HL),A
C892 INC HL
C893 LD (HL),A
C894 ADD HL,DE
C895 DJNZ COLOUR_STRIP_0
C897 RET
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