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why does mov a,a show an error but mov b,b doesnt give any error?
so mov a,acc works!
What "error", exactly, does it show?
Have you tried to relate that error to the definition of the instruction in the Instruction Set Manual...?
mov acc, acc mov acc, a mov a, acc
All of above should work fine. Reading about the instruction set should help to give information as to why.
Michael Karas