INTERFACING 8279 KEYBOARD/DISPLAY CONTROLLER WITH 8085 MICROPROCESSOR

To interface 8279 Programmable Keyboard Display Controller to 8085 Microprocessor.

APPARATUS REQUIRED:
1) 8085 Microprocessor toolkit.
2) 8279 Interface board.
3) VXT parallel bus.

4) Regulated D.C power supply.

PROGRAM:
START: LXI H,4130H
MVI D,0FH ;Initialize counter.
MVI A,10H
OUT C2H ;Set Mode and Display.
MVI A,CCH ;Clear display.
OUT C2H
MVI A,90H ;Write Display
OUT C2H
LOOP: MOV A,M
OUT C0H
CALL DELAY
INX H
DCR D
JNZ LOOP
JMP START
DELAY: MVI B, A0H
LOOP2: MVI C, FFH
LOOP1: DCR C
JNZ LOOP1
DCR B
JNZ LOOP2
RET

Pointer equal to 4130 .FF repeated eight times.
4130 - FF
4131 –FF
4132 –FF
4133 –FF
4134 –FF
4135 –FF
4136 –FF
4137 –FF
4138 –98
4139 –68
413A -7C
413B -C8
413C -1C
413D -29
413E -FF
413F -FF