$1\mathrm{.}6$ Data Transfer via a BusIt is often necessary to transfer $8-$ or $16-$bit words in $4-$bit sections via the same conduction for processing and administering data in digital technique. This principle is e$.$g$.$ used concerning input and output units for systems of processors.The following circuit is supposed to be simulated. The components that are used are a RAM $(74170,$ a $4$X$4$ bit registers with open$-$collector$)$ and two $4-$bit D$-$type$-$registers with a tristate output $74$LS$173$A$.$