You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.0 KiB
NASM
58 lines
1.0 KiB
NASM
.model small ; It's a flaw of mine ... I really like this model
|
|
; I know I should do a .com with the tiny model..
|
|
; but I just love the small :>
|
|
.stack 100h ; Plenty stack ;>
|
|
.386
|
|
|
|
.data
|
|
info db 30 dup (0)
|
|
right db 'Right CD$'
|
|
wrong db 'Wrong CD$'
|
|
nomscdex db 'MSCDEX not installed$'
|
|
.code
|
|
mov ax, @data ; Make DS&ES point to the DATA
|
|
mov ds,ax
|
|
mov es,ax
|
|
|
|
lea edx, nomscdex
|
|
xor ebx,ebx
|
|
mov eax, 1500h ; MSCDEX installed?
|
|
int 2fh
|
|
test ebx,ebx
|
|
jz exit
|
|
|
|
|
|
mov edi,10h
|
|
nextloop:
|
|
mov ecx,edi
|
|
mov ax, 150bh ; is drive ECX supported by MSCDEX (is it a cdrom?)
|
|
int 2fh
|
|
test ax,ax ; ax!=0 if drive is CDrom
|
|
jz continiue
|
|
|
|
mov ax, 440dh
|
|
mov dx, offset info
|
|
mov bl,5
|
|
mov ch,8
|
|
mov cl,66h
|
|
int 21h ; Fetch volume serial number (same as when you do dir)
|
|
|
|
mov eax, dword ptr [info+2]
|
|
cmp eax, 0ffb7f724h; ;<<<<calibrate this to fit your own "right" CD
|
|
jnz continiue
|
|
|
|
lea edx, right
|
|
jmp exit
|
|
|
|
continiue:
|
|
dec edi ; next drive
|
|
jnz nextloop
|
|
lea edx, wrong ; not in any drive!
|
|
exit:
|
|
mov ah, 9h
|
|
int 21h
|
|
|
|
mov ax,4c00h ; terminate!
|
|
int 21h
|
|
|
|
end |