A microprocessor-based system is used to transfer 8-bytes of data beginning from memory location 1070011 to port B of 8255 PPI each time an interrupt requests signal transition from 0 to 1. The interrupt type 50H is generated by using 74244 tri state buffer. (a) Design the circuit with the following addresses: control register of 8255-93H and port B-91H. (b) Write an 8088 program to drive the circuit assuming that CS-DS-1000H, SS-4000H, Main program offset is 200H, Interrupt service routine code segment is 2000H, Interrupt-service routine offset is 1000H, and the stack has an offset of 500H from the current stack segment.

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem include…