Since Bill pointed this out, are you sure this is doing what you expect it to be doing?
AND #$C0
CLC
ROL
ROL
ROL
This code has the effect of moving Bit7 to Bit1, Bit6 to Bit0 and Bit5 to the Carry. Since the AND isolates bits 5 and 7 I suspect this is not what you intend:
Start With: #%10100000 c=0
ROL: #%01000000 c=1
ROL: #%10000001 c=0
ROL: #%00000010 c=1
If you're looking to move the high nibble to low, you need another ROL. Though I'd suggest just doing 4 LSR's instead and not have to worry about the Carry at all.
Chris...
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