The following questions are set up in view of the figure b) a) Describe what type of I/O operation is carried out in Figure (b). Write a sequence of instructions to initialize the control register in PPI 0 in Figure (b) so that PA is an output port, PB and Pc are input ports. Initialize all the necessary registers. Ports are configured for mode 0 operation. b) Write a program to input the contents of PB and Pc then OR them together and send the resultant to PA. These ports are the PPI O ports in Figure (b). Ports are configured for mode 0 operation. Initialize all the necessary registers. Write comments and Use minimum number of instructions in your programs. Control bus Address bus Ao Ang Data bus Do-D ob- As D A B As [ Ao 74F138 GB To other even address peripheral 10/M 17 8 1 GA Aid G -- IN 0. CS Port A D-D1 Do-D A A, 8255A Port C Az A RD RD Port B WR WR Figure 7.27 Memory-mapped 8255A I/O ports in an 8088 microcomputer, Figure (b) The following questions are set up in view of the figure b) a) Describe what type of I/O operation is carried out in Figure (b). Write a sequence of instructions to initialize the control register in PPI 0 in Figure (b) so that PA is an output port, PB and Pc are input ports. Initialize all the necessary registers. Ports are configured for mode 0 operation. b) Write a program to input the contents of PB and Pc then OR them together and send the resultant to PA. These ports are the PPI O ports in Figure (b). Ports are configured for mode 0 operation. Initialize all the necessary registers. Write comments and Use minimum number of instructions in your programs. Control bus Address bus Ao Ang Data bus Do-D ob- As D A B As [ Ao 74F138 GB To other even address peripheral 10/M 17 8 1 GA Aid G -- IN 0. CS Port A D-D1 Do-D A A, 8255A Port C Az A RD RD Port B WR WR Figure 7.27 Memory-mapped 8255A I/O ports in an 8088 microcomputer, Figure (b)