$(25$pts$)$ a$)$ What is the purpose of the following program? b$)$ After the following program is the contents of $A,R5,R6$ and R$7?$

MOV $A,$ #OFFH

MOV P$1,$ A

MOV P$1,$ #$0$E$8$H

MOV A$,$ P$1$

MOV $B,$#$10$

DIVAB

MOV R$7,$ B

$0=$ MOV $B,$#$10$

$I=$DIVAB

MOV $R6,B$

MOV R$5,$ A

$R5=$

$R6=$

$R7=$

ACC$=$