a. [5 marks] List the controlsignals that are required in the parallel interface

Question

a.      [5 marks] List the controlsignals that are required in the parallel interface between an82C55A and an external printer device that is connected to portA.

b.     [3 marks] In which mode should youoperate port A in part (a) in order to implement a properinterfacing with the printer device.

c.     [5 marks] Compare between interfacing8088/8086 MPU to external devices using standard discrete TTLcomponents and LSI programmable peripherals.

Q2:

a.      [10 marks] Assume that port Bresides at address F0 in the I/O address space. Write an assemblyprogram that will perform blinking operations on two LEDS that areconnected to port B (PB3, PB7) in an 82C55A. The blinking sequenceis done in such a manner where the first LED blinks 3 times and thesecond LED blinks 4 times in an interval of 6 seconds [considerequal times between the blinks]

b.     [4 marks] What are the decodingrequirements on the side of an 8088 processor?

c.     [10 marks] Draw a block diagram thatperforms the above program. Show all the various components and thevarious connections.

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