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PC World Komputer 1999 mARCH
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ASPIENT.ASM
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Assembly Source File
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1994-12-31
|
935b
|
53 lines
include farnear.inc
_TEXT segment byte public 'CODE'
assume cs:_TEXT
mgrname db 'SCSIMGR$',0
program _ASPI_entry ; int ASPI_entry(void far (**)())
push bp
mov bp,sp
push ds
push cs
pop ds
lea dx,mgrname
mov ax,3d00h
int 21h ; open file
mov cx,-1 ; does not affect flags
jc short return
push ax ; save the handle
xchg ax,bx ; mov bx,ax
mov ax,4400h
int 21h ; query device info
jc short error
test dl,dl ; is it device or file?
jns short error
pop bx ; restore the handle
push bx ; put it back again
lds dx,arglist
mov cx,4
mov ax,4402h
int 21h ; read the pointer
jc short error
xor cx,cx ; mark success
jmp short close
error:
mov cx,-1 ; mark an error
close:
pop bx ; BX := handle
mov ah,3Eh
int 21h
return:
xchg ax,cx ; mov ax,cx
pop ds
pop bp
ret
_ASPI_entry endp
_TEXT ends
end