Which one of the descriptions$/$examples best matches each concept.

$1.$ memory$-$mapped I$/$O

a$.$ designating the opcode $0011$ in LC$-3$ for memory storage

b$.$ repeatedly checking bit $15$ of the KBSR in LC$-3$

c$.$ using data movement instructions to display output

d$.$ repeatedly checking bit $15$ of the DDR in LC$-3$

e$.$ processor first synchronizing with the device before doing I$/$O

f$.$ the processor reading input at a fixed rate

g$.$ requiring specialized knowledge and protection for a routine

h$.$ designating the opcode $1101$ in LC$-3$ for I$/$O

i$.$ a device signalling the processor it needs attention

j$.$ the operating system signalling a device that its needs I$/$O

$2.$ interrupt

a$.$ designating the opcode $0011$ in LC$-3$ for memory storage

b$.$ repeatedly checking bit $15$ of the KBSR in LC$-3$

c$.$ using data movement instructions to display output

d$.$ repeatedly checking bit $15$ of the DDR in LC$-3$

e$.$ processor first synchronizing with the device before doing I$/$O

f$.$ the processor reading input at a fixed rate

g$.$ requiring specialized knowledge and protection for a routine

h$.$ designating the opcode $1101$ in LC$-3$ for I$/$O

i$.$ a device signalling the processor it needs attention

j$.$ the operating system signalling a device that its needs I$/$O

$3.$ synchronous I$/$O

a$.$ designating the opcode $0011$ in LC$-3$ for memory storage

b$.$ repeatedly checking bit $15$ of the KBSR in LC$-3$

c$.$ using data movement instructions to display output

d$.$ repeatedly checking bit $15$ of the DDR in LC$-3$

e$.$ processor first synchronizing with the device before doing I$/$O

f$.$ the processor reading input at a fixed rate

g$.$ requiring specialized knowledge and protection for a routine

h$.$ designating the opcode $1101$ in LC$-3$ for I$/$O

i$.$ a device signalling the processor it needs attention

j$.$ the operating system signalling a device that its needs I$/$O