$1.$ Write concrete RTN steps for the SRC instructions add using the $1-$bus SRC microarchitecture.

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$2.$ Write concrete RTN steps for the SRC instructions addi using the $1-$bus SRC microarchitecture.

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$3.$ Extend the SRC instruction set by adding the instruction swap ra$,$ rb$,($op $=7),$ which exchanges the contents of the two specified registers. A plausible abstract RTN for this instruction is:

swap$($:$=$ op $=7)($R$[$ra$]$R$[$rb$]$: R$[$rb$]$R$[$ra$])$

Develop the concrete RTN for it$,$ assuming the $1-$bus SRC microarchitecture

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$4.$ Write control sequences for the add instruction implemented in $1-$bus microarchitecture of question $1.$

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$5.$ Write control sequences for the addi instruction implemented in $1-$bus microarchitecture of question $2.$

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$6.$ Write control sequences for the swap instruction implemented in $1-$bus microarchitecture of question $3.$

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Write concrete RTN steps for the SRC instructions st $($store$)$ using the $1-$bus SRC