V$\backslash$a$.$ Draw the format of command register of DMA Controller and explain.

b$.$ Draw the descriptor format of $80286$ and explain.

c$.$ If direction D is $0$ DI $=01$FFH$,$ SI $=0100$H$,$ then what will be the value of SI and DI after execution of MOVSD instruction in $8086?$ Explain.

d$.$ Consider a memory address, $256$K X $8$ DRAM.

i$)$ Specify the number of data pins, address pins, selection pins and control pins of the given memory device.

ii$)$ Explain how address pins are demultiplexed in the given memory device?

e$)$ What happens in $8086/8088$ when Test input is at logic $1?$

f$)$How many address pins there in a $4$K memory device?