88 lines
1.3 KiB
NASM
88 lines
1.3 KiB
NASM
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[BITS 16]
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[ORG 0x100]
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section .text
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start:
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mov ah,09
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mov dx,msg
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int 0x21
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cmp byte [0x80],2
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jne near error
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mov ax,0x3D02
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mov dx,name
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int 0x21
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jc near error
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mov bx,ax
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mov ax,0x4202
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xor cx,cx
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xor dx,dx
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int 0x21
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jc error
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cmp dx,0
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jne error
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cmp ax,512
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jne error
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mov ax,0x4200
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xor cx,cx
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xor dx,dx
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int 0x21
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jc error
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mov ah,0x3F
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mov cx,512
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mov dx,buffer2
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int 0x21
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jc error
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cmp word [buffer2+510],0xAA55
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jne error
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mov al,[0x82]
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cmp al,'z'
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ja error
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cmp al,'a'
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jb verif
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sub al,'a'-'A'
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verif:
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cmp al,'Z'
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ja error
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cmp al,'A'
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jb error
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sub al,'A'
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mov bp,ax
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mov [segs],cs
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mov cx,0xFFFF
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mov bx,packet
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int 0x25
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pop ax
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mov si,buffer+3
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mov di,buffer2+3
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mov cx,59
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rep movsb
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mov ax,bp
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mov word [offs],buffer2
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mov cx,0xFFFF
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mov bx,packet
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int 0x26
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pop ax
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jc error
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mov ah,09
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mov dx,msgok
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int 0x21
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ret
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error:
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mov ah,09
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mov dx,msgerror
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int 0x21
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ret
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packet dd 0
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dw 1
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offs dw buffer
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segs dw 0
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name db "boot.bin",0
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msg db 0x0D,0x0A,"CopyBoot V1.0 by nico",0x0D,0x0A,"Copyright 2002",0x0D,0x0A,'$'
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msgok db "Installation of bootsector realized",0x0D,0x0A,'$'
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msgerror db "Installation of bootsector failed",0x0D,0x0A,'$'
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buffer equ $
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buffer2 equ $+512
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