In this question it is proposed to continuously read the status of a $4$ bits DIP switches $($binary numbers between $0000$ and $1001).$ The DIP switches is connected to the PPI $8255$ PORTA $($PA$0,$ PA$1,$ PA$2$ and PA$3)$ and two seven segments display $($Display $0$ and Display $1)$are connected to PORTC of the PPI $8255($PC$0,$ PC$1,$ PC$3)$ using transcoder $74$LS$47$ as shown in figure $1.$ For example, if the DIP switches combination is $"1001"($ODD$),$ the number $"9"$ will be displayed on Display $1.$

$($a$)$ Complete the following table and find the base address of the PPI $8255$ and then the address of PORT A$,$ PORT B$,$ PORT C and CONTROL. Truth table of the IC $74$LS$138$ is shown in Table $1.$

$\backslash$table$[[,A_{15}{A}_{14}{A}_{13}{A}_{12},A_{11}{A}_{10}{A}_9{A}_8,A_7{A}_6{A}_5{A}_4,A_3,A_2,A_1,A_0,$ADDRESS$],[$PORT A$,,,,,,,,],[$PORT B$,,,,,,,,],[$PORT C$,,,,,,,,],[$CONTROL$,,,,,,,,]]$

$($b$)$ Find the appropriate control word $($see Figure $2).$

$($c$)$ Write the corresponding $8086$ Assembly Language Program.

$\backslash$table$[[$INPUTS$,$OUTPUTS$],[\frac{?}{\text{b}\text{a}\text{r}}(G2A),\frac{?}{\text{b}\text{a}\text{r}}(G2B),$G$1,$C$,$B$,$A$,\frac{?}{\text{b}\text{a}\text{r}}(Y0),\frac{?}{\text{b}\text{a}\text{r}}(Y1),\frac{?}{\text{b}\text{a}\text{r}}(Y2),\frac{?}{\text{b}\text{a}\text{r}}(Y3),\frac{?}{\text{b}\text{a}\text{r}}(Y4),\frac{?}{\text{b}\text{a}\text{r}}(Y5),\frac{?}{\text{b}\text{a}\text{r}}(Y6),\frac{?}{\text{b}\text{a}\text{r}}(Y7),,],[1,,,,,,1,1,1,1,1,1,1,1,,],[,1,,,,,1,1,1,1,1,1,1,1,,],[,,0,,,,1,1,1,1,1,1,1,1,,],[0,0,1,0,0,0,0,1,1,1,1,1,1,1,,],[0,0,1,0,0,1,1,0,1,1,1,1,1,1,,],[0,0,1,0,1,0,1,1,0,1,1,1,1,1,,],[0,0,1,0,1,1,1,1,1,0,1,1,1,1,,],[0,0,1,1,0,0,1,1,1,1,0,1,1,1,,],[0,0,1,1,0,1,1,1,1,1,1,0,1,1,,],[0,0,1,1,1,0,1,1,1,1,1,1,0,1,,],[0,0,1,1,1,1,1,1,1,1,1,1,1,0,,]]$

Table $1.$ Truth table of the IC $74$LS$138.$

$($please note this is $8086)$