Routines
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66F7: Convert Screen Address To Attribute Buffer Address
Used by the routines at Configurable_PrintString, 70E7, 7564, 75BF, 7616 and Handler_Aliens.
ConvertScreenToAttributeBufferAddress 66F7 LD A,D A=D.
66F8 AND %00011000 Keep only bits 3-4.
66FA SRA A Shift A right three positions (with carry).
66FC SRA A
66FE SRA A
6700 ADD A,$58 A+=58.
6702 LD D,A D=A.
6703 RET Return.
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