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KeyboradInterrupt.ASM
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KeyboradInterrupt.ASM
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DATA_SEG SEGMENT
KEYCODE DB 01EH,030H,02EH,020H,012H,021H,022H,023H,017H,024H,025H,026H,032H,031H,018H,019H,010H,013H,01FH,014H,016H,02FH,011H,02DH,015H,02CH
COUNT DW 0
FLAG DW 0
MESSAGE DB 'BLING$'
MESSAGE1 DB 'DISABLED$'
MESSAGE2 DB 'CODING$'
NEXT_LAST_ADDER EQU $+1
DATA_SEG ENDS
STACK_SEG SEGMENT
STACK DW 100 DUP(0)
TOP EQU 200
STACK_SEG ENDS
CODE_SEG SEGMENT
ASSUME CS:CODE_SEG, DS:DATA_SEG, SS:STACK_SEG
START:
MOV AX, STACK_SEG
MOV SS, AX
MOV SP, TOP
MOV AX, DATA_SEG
MOV DS, AX
CALL FAR PTR INITIATE0 ;8259
CALL FAR PTR INITIATE1 ;KEYBOARD
CALL FAR PTR INITIATE2 ;8253
JMP DISABLE
LOOP1:
MOV AX, 600
MOV BX, COUNT
CMP BX, AX
JA CODE
JMP LOOP1
LOOP2:
MOV AX, 600*2
MOV BX, COUNT
CMP BX, AX
JA CLR
JMP LOOP2
DISABLE:
MOV AX, 0
MOV FLAG, AX
MOV AH, 9
MOV DX, SEG MESSAGE1
MOV DS, DX
MOV DX, OFFSET MESSAGE1
INT 21H
JMP LOOP1
CODE:
MOV AX, 1
MOV FLAG, AX
MOV AH, 9
MOV DX, SEG MESSAGE2
MOV DS, DX
MOV DX, OFFSET MESSAGE2
INT 21H
JMP LOOP2
CLR:
MOV AX, 0
MOV COUNT, AX
JMP DISABLE
INITIATE0 PROC FAR ;8259
PUSH AX
MOV AL, 13H
OUT 20H, AL
MOV AL, 8
OUT 21H, AL
MOV AL, 9
OUT 21H, AL
POP AX
RET
INITIATE0 ENDP
INITIATE1 PROC FAR ;KETBOARD
PUSH AX
PUSH BX
PUSH ES
CLI
MOV AX, 0
MOV ES, AX
MOV BX, 9*4
MOV AX, OFFSET INTRAD1
MOV ES:[BX], AX
MOV AX, SEG INTRAD1
MOV ES:[BX+2], AX
STI
POP ES
POP BX
POP AX
RET
INITIATE1 ENDP
INITIATE2 PROC FAR ;8253
PUSH AX
MOV AL, 36H
OUT 43H, AL
MOV AL, 20H
OUT 40H, AL
MOV AL, 4EH
OUT 40H, AL
CLI
MOV AX, 0
MOV ES, AX
MOV BX, 8*4
MOV AX, OFFSET INTRAD2
MOV ES:[BX], AX
MOV AX, SEG INTRAD2
MOV ES:[BX+2], AX
STI
POP AX
RET
INITIATE2 ENDP
INTRAD1:
PUSH AX
PUSH DX
PUSH DS
STI
IN AL, 060H
PUSH AX
IN AL, 061H
MOV AH, AL
OR AL, 80H
OUT 061H, AL
XCHG AH, AL
OUT 061H, AL
POP AX
CMP AL, 39H
JE EXIT
MOV DX, FLAG
CMP DX, 0
JE BLOCK
MOV BX, SEG KEYCODE
MOV DS, BX
MOV BX, 0
COMPARE:
MOV DL, [BX]
CMP AL, DL
JE DISPLAY
CMP BX, 26
JE BLOCK
ADD BX, 1
JMP COMPARE
DISPLAY:
ADD BX, 1
CMP BX, 25
JBE LOOP_A_Z
MOV BX, 0
LOOP_A_Z:
ADD BX, 61H
MOV DL, BL
MOV AH, 2
INT 21H
BLOCK:
CLI
MOV AL, 20H
OUT 20H, AL
POP DS
POP DX
POP AX
IRET
INTRAD2:
STI
PUSH AX
MOV AX, COUNT
ADD AX, 1
MOV COUNT, AX
CLI
MOV AL, 20H
OUT 20H, AL
POP AX
IRET
EXIT:
LEA DX, NEXT_LAST_ADDER
INT 27H
CODE_SEG ENDS
END START