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Clear_x_b_80 ($F550)
This routine sets the block of memory pointed to by the X
register to $80. The B register specifies the number of bytes to
be cleared.
ENTRY:
B-reg = number of bytes to clear ($00 = 256)
X-reg points to start of memory block to clear
EXIT:
A-reg = $80
B-reg = $00
Source
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