Q$7.//5$ points $(3+1+1)$ a$.$ In the IBM $360$ Models $65$ and $75,$ addresses are staggered in two separate main memory units $($e$.$g$.,$ all even$-$numbered words in one unit and all odd$-$numbered words in another$).$ What might be the purpose of this technique? b$.$ While browsing at Billy Bob$$s computer store, you overhear a customer asking Billy Bob what is the fastest computer in the store that he can buy. Billy Bob replies, $$You$$re looking at our Macintoshes. The fastest Mac we have runs at a clock speed of $1\mathrm{.}2$ GHz$.$ If you really want the fastest machine, you should buy our $2\mathrm{.}4-$GHz Intel Pentium IV instead.$$ Is Billy Bob correct? What would you say to help this customer? c$.$ The ENIAC, a precursor to the ISA machine, was a decimal machine, in which each register was represented by a ring of $10$ vacuum tubes. At any time, only one vacuum tube was in the ON state, representing one of the $10$ decimal digits. Assuming that

ENIAC had the capability to have multiple vacuum tubes in the ON and OFF state simultaneously, why is this representation $$wasteful$$ and what range of integer values could we represent using the $10$ vacuum tubes?