2022-08-21 09:07:57 +00:00
code seg ment public 'code'
assume cs : code , ds : code , es : code
org 100h
Main: mov ah , 30h ; fn 30h = Get Dosversion
int 21h ; int 21h
cmp al , 4 ; major dosversion
sbb si , si
mov ah , 52h ; get internal list of lists
int 21h ; int 21h
lds bx , es :[ bx ] ; get pointer to first drive
; paramenter block
Search: mov ax , ds :[ bx + si + 15h ] ; get segment of device header
cmp ax , 70h ; dos device header ??
jne Next ; no, go to next device
cmp byte ptr ds :[ bx ], 0
je Next
xchg ax , cx
mov di , ds :[ bx + si + 13h ] ; get offset of device header
mov word ptr ds :[ bx + si + 13h ], offset Header
mov ds :[ bx + si + 15h ], cs ; set addres of new device
Next: lds bx , ds :[ bx + si + 19h ] ; next drive parameter block
cmp bx , - 1 ; last block ?
jne Search ; no, go to Search
jcxz Error
mov ds , cx
mov si , di
push cs
pop es
mov di , offset Header
cld
movsw
movsw
movsw
mov ax , offset Strategy
stosw
mov ax , offset Interrupt
stosw
push di
mov di , offset Strategy
mov al , 0eah
stosb
movsw
mov ax , cx
stosw
mov di , offset Interrupt
mov al , 0eah
stosb
movsw
mov ax , cx
stosw
pop di
movsw
mov ax , 3100h
mov dx , 20h
int 21h
Error: mov ax , 4c01h
int 21h
Header db 12 dup ( ? )
Interrupt db 5 dup ( ? )
Strategy db 5 dup ( ? )
code ends
end Main
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