1. mov a,30h
mov 30h,40h
mov 40h,a
2. mov r0, #30h
mov r1, #40h
mov a, @r0
mov b, @r1
mov @r1, a
mov @r0, b
3. xch a, 30h
xch a, 40h
xch a, 30h
4. push 30h
push 40h
pop 30h
pop 40h
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