${?}_{{?}_{{?}_{?}}{?}_h\text{o}\text{l}\text{d}\text{s}\text{d}\text{a}\text{t}\text{a}\text{w}\text{h}\text{e}\text{n}\text{t}\text{h}\text{e}\text{c}\text{o}\text{m}\text{p}\text{u}\text{t}\text{e}\text{r}is\text{o}\text{f}\text{f}\text{.}}$

Random access memory

Read$-$only memory

Secondary memory

Programmable read$-$only memory