;Hello,
;  this file contains some stupid anti DUMPEXE code!
;  Compile to COM and enjoy!
;
;(c) 1996 by Piotr Warezak
;awarezak@krysia.uni.lodz.pl

assume cs:code;ss:stack;
segment code

        org 100h
start:
; ***** CHECK FOR DUMPEXE RESIDENT PROGRAM
        xor ax,ax
        mov ds,ax
        mov es,word ptr ds:[0fch*4+2]   ;look for DUMPEXE (check FCh vector)
        mov di,word ptr ds:[0fch*4]
        call    dumpexe
db 50h,53h,51h,52h,56h,57h,1eh,06h,55h,89h,0e5h,0d8h,0e3h
dumpexe:
        pop     si
        mov cx,12
        repe cmpsb
        jcxz halt
        jmp short ok
        db 09ah
halt:   cli                             ;DUMPEXE installed - halt system!!!
        hlt
        jmp     halt

ok:     ret                             ;DUMPEXE not installed - continue

code ends;
end start;