$6.$ It is desired to create an addition circuit using a ROM $($look$-$up table$).$ We will add

two $16$ bit numbers together, and get a $17$ bit output.

a$.$ How many addresses are required in the ROM?

b$.$ How many bits wide is the address bus for the ROM?

c$.$ How many total bits are required to implement the look$-$up table?

$7.$ We want to connect a Z$-80$ microprocessor to $64$ kB of memory. The memory chip

we will use is the $6264.$ See the data sheet attached to this homework. Details of

the Z$-80$ are in the lecture notes. You can ignore the I$/$O$.$

a$.$ How many memory chips do we need to use to have a $64$ kB address space?

b$.$ How many chip enables are there on the memory chip? Are they active

high or active low?

c$.$ Draw a schematic to connect the Z$-80$ microprocessor to the memory chips.