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Procedure for swapping bits in R0

Alexey Fomichev

Good day! Can someone check my code for mistakes? And, if there are mistakes, help me to fix it. This procedure should swap bits in R0 and be 'effective'.

//'n' is bit, that procedure should swap with 'm'
n equ 1
m equ 4
push R0
call swap
swap:
pop R0
push A
mov 20h, R0
mov C, 20h.n
mov 21h.0, C
mov C, 20h.m
mov 20h.n, C
mov C, 21h.0
mov 20h.m, C
mov R0, 20h
pop A
RET

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