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- .MODEL SMALL
- .STACK 16
- .CODE
- BLANKVGA PROC FAR
- MOV AL,1
- MOV DX,3C4H
- OUT DX,AL
- INC DX
- IN AL,DX
- OR AL,20H
- OUT DX,AL
- MOV AH,2CH
- INT 21H
- ADD DH,3
- CMP DH,60
- JL _100
- SUB DH,60
- _100: MOV BL,DH
- _200: MOV AH,2CH
- INT 21H
- CMP BL,DH
- JNE _200
- MOV AL,1
- MOV DX,3C4H
- OUT DX,AL
- INC DX
- IN AL,DX
- AND AL,NOT 20H
- OUT DX,AL
- MOV AX,4C00H
- INT 21H
- BLANKVGA ENDP
- END BLANKVGA
-