$1\mathrm{.}1.[12$ marks$]$ If the interrupt service routine of the basic computer $(BC)$ starts at location FOO and if the input and output buffers start at locations DOO and EOO respectively, write the full interrupt service routine in assembly. Also show the contents of locations $0$ and $1$ in hexadecimal during the execution of the interrupt service routine assuming that the interrupt being handled was originally raised during the execution of an instruction at location $1$AF$.$