14. Assume that there is a two digit common anode 7-segment LED display connected to the lower 4 bits of port B of a PPI (8255) at address 0640H (Address of the port B). The display is connected to the PPI through a Hexadecimal to 7 Segment Display driver chip (74LS47) as shown in Figure 1. Dip-switch is connected to port C Lower. Pull-Up NPN transistors are connected to port C Upper. a) What are the addresses of port A, port B, port C, and control register PCW. b) Which control word is required to interface the seven segment displays and Dip-switch. Page 2 c) Consider only Display 1. Write an 8086 ALP program to read the status of the Dip-switch continuously and display it on Display 1. d) Again, consider only Display 1. Write an 8086 ALP program to display on Display 1 the number of the switch that change of status. Assume switches are numbered from 1 to 4 and only one switch change of status at a time. e) Consider now Display 1 and Display 2. Write an 8086 ALP program to read the status of the Dipswitch continuously and display it on Display 1 bit 0 is equal to 1 . Otherwise display the status of the Dip-switch on Display 2