converting 8-bit binary to ascii
;upon return r5,r1,r0 have ascii data (r5=MSB and r0=LSB)
conv: mov b,#10
div ab ;divide by 10
mov r0,b ;save low digit
mov b,#10 ;divide by 10 once more
div ab
orl a,#30h ;make 1st digit an ascii
mov r5,a ;save the ascii (MSD)
mov a,b
orl a,#30h ;make 2nd digit an ascii
mov r1,a ;save the ascii
mov a,r0
orl a,#30h ;make 3rd digit an ascii
mov r0,a ;save the ascii (LSD)
end