73 lines
1.0 KiB
NASM
73 lines
1.0 KiB
NASM
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_TEXT SEGMENT BYTE PUBLIC 'CODE'
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ASSUME CS:_TEXT
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PUBLIC _VUELCA_PANTALLA_B
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_VUELCA_PANTALLA_B PROC NEAR
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PUSH BP
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MOV BP,SP
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PUSH AX
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PUSH BX
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PUSH CX
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PUSH DI
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PUSH DS
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PUSH DX
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PUSH ES
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PUSH SI
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LDS SI,[BP+4]
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MOV AX,0A000h
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MOV ES,AX
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MOV DI,0
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MOV AH,00010001b
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MOV DX, 480
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CLD
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SIG_LINEA: MOV BX,4
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SON_4_PLANOS: PUSH AX
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PUSH DX
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MOV DX,3C4H ;MASCARA DE PLANOS
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MOV AL,2
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OUT DX,AX
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POP DX
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POP AX
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MOV CX,80
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LINEA: MOV AL,ES:[DI]
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MOVSB
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CMP SI,0
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JNZ MISMO_SEG
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MOV BP,DS
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ADD BP,1000h
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MOV DS,BP
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MISMO_SEG: LOOP LINEA
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SUB DI,80
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ROL AH,1
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DEC BX
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JNZ SON_4_PLANOS
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ADD DI,80
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DEC DX
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JNZ SIG_LINEA
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POP SI
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POP ES
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POP DX
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POP DS
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POP DI
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POP CX
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POP BX
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POP AX
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POP BP
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RET
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_VUELCA_PANTALLA_B ENDP
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_TEXT ENDS
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END
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