Routines
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28716: Wait for interrupt then flood 7th - 22nd rows of attribute file with attribute in HL
Used by the routines at 27762 and 27951.
Input
HL Attribute to use
28716 HALT Wait for interrupt
28717 LD (35670),SP Store stack pointer at 35670
28721 LD SP,23264 Point stack pointer at start of last row of attribute file
28724 LD BC,4098 Load B with 16 (repeat inner loop 16 times) and C with 2 (repeat outer loop twice)
28727 JP 35663 Clear 7th to 23rd rows of attribute file
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