🚀 go-pugleaf

In article <1993Jan11.151339.26243@nntpd.lkg.dec.com> j_pan@ranger.enet.dec.com (Joanna Pan) writes:
>
>I am porting a DOS application to Windows environment. Can I use in-line
>assembly to make an interrupt call ? It's not the regular int 21h or int 5Ch.
>e.g.
>	_asm {
>	     push  ds
>	     push  ax
>	     mov   ax, 0DE11h	; some function code
>	     int   78h		; call ISR
>	     pop   ax
>	     pop   ds
>	     }
Yes, but bear in mind that windows may be using some vectors that were
available in DOS.
>
>Can I use 32-bit registers instead of 16-bit ? 
You can use them, but I don't think the in line assembler recognizes them.

>If I choose to write a separate assembly file, can I write truely 
>32-bit programme ?
No. Windows normally runs code with 16 bit segment limits, you can use
the 32 bit registers, but you can't use them to address past the end of the
segment. For true 32 bit programming you need Win32s from the NT beta,
or one of the third party add ons. (I think Watcom has one).
>_______________________________________________________________________________
>!	Joanna Pan			email:j_pan@ranger.enet.dec.com       !
>! 	Personal Computer Systems Group					      !
>!	Digital Equipment Corporation					      !
>!	Littleton, Massachusetts					      !
>-------------------------------------------------------------------------------

Tom Hill