hi,

just eject skip loop contents in the whole:

SKIP: RETI

As well, insert loading of #10 into B register here:

MOV A,DPL
MOV B,#10
MUL AB

It is because your setup loads this value only at startup time and then after MOV B,R0 the contents of B register is not defined anymore.

By the way,

MOV B,R0
ADD A,B

may be replaced with simple ADD A,R0.

Regards,
Oleg