Routines
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D53C: Fill BC bytes at HL with E
Used by the routines at clr_attribute_memory and fill_attr.
Input
HL the first byte
BC the count
E the value
clr_byte D53C LD (HL),E
D53D INC HL
D53E DEC BC
D53F LD A,B
D540 OR C
D541 JR NZ,clr_byte
D543 RET
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