Hi Peter,

Here is the code. It multiplies the value in R0,Acc by 10.

;Input: Acc-msB,r0-lsB
MOV B,#10
MUL AB
XCH A,R0
MOV B,#10
MUL AB
XCH A,R0
ADD A,B
;Output: Acc-msB,r0-lsB

By,

George