8086 interfacing with 8279

Problem Statement: 8279

Write 8086 ALP to initialise 8279 and to display characters in right entry mode.
Provide also the facility to display
• Character in left entry mode.
• Rolling display.
• Flashing display


1. Left entry mode
0000:3000  MOV BX,2000
0000:3003  MOV AL,08
0000:3005  OUT 31,AL
0000:3007  MOV CL,08
0000:3009  MOV AL,D1
0000:300B  OUT 31,AL
0000:300D  MOV DL,FF
0000:300F  DEC DL
0000:3011  JNZ 300F
0000:3013  MOV AL,[BX]
0000:3015  OUT 30,AL
0000:3017  MOV DL,FF
0000:3019  DEC DL
0000:301B  JNZ 3019
0000:301D  INC BX
0000:301E  DEC CL
0000:3020  JNZ 3013
0000:3022  INT 3

2. Rolling display
0000:3000  MOV AL, 18
0000:3002  OUT 31, AL
0000:3004  MOV AL, D1
0000:3006  OUT 31, AL
0000:3008  CALL 1000
0000:300B  MOV AL, 90
0000:300D  OUT 31, AL
0000:300F  MOV BX, 2000
0000:3012  MOV CL, 10
0000:3014  MOV AL, [BX]
0000:3016  OUT 30, AL
0000:3018  CALL 1000
0000:301B  INC BX
0000:301C  DEC CL
0000:301E  JNZ 3014
0000:3020  JMP 300F
0000:3022  INT 3

0000:1000  MOV DX,FFFF
0000:1003  DEC DX
0000:1004  JNZ 1003
0000:1006  RET

3. Flashing display
0000:4000  MOV BX,2000
0000:4003  MOV AL,08
0000:4005  OUT 31,AL
0000:4007  MOV CL,08
0000:4009  MOV AL,D1
0000:400B  OUT 31,AL
0000:400D  CALL 1000
0000:4010  MOV AL,[BX]
0000:4012  OUT 30,AL
0000:4014  CALL 1000
0000:4017  INC BX
0000:4018  DEC CL
0000:401A  JNZ 4010
0000:401C  MOV AL,A3
0000:401E  OUT 31,AL
0000:4020  CALL 1000
0000:4023  MOV AL,A0
0000:4025  OUT 31,AL
0000:4027  CALL 1000
0000:402A  JMP 401C
0000:402C  INT 3

0000:1000  MOV DX,FFFF
0000:1003  DEC DX
0000:1004  JNZ 1003
0000:1006  RET