Yes but... that's not using a BIOS call. I'm trying to avoid bit banging
in my code (by handing it off to bios). INT17, function 00 sends the
contents of AL to the printer and takes care of all handshaking. I'm
looking for a similar call to read stuff back in byte mode (or PS/2
mode).

Thanks!

Harold


On Tue, 28 Aug 2001 09:11:03 +1000 David Huisman
<david.huisman@ADVMININGTECH.COM.AU> writes:
> Assembly..
>
> I think you'll find it is "in" and "out".
>
> From memory, the DX register is used to pass the address of the port
> and AX
> used for data. (you can retrive 8-bit data from AL register). I
> think it
> goes something like.
>
> DX = $3f8 (your port address)
> AX = in(DX)
> Data = AL
>
> and..
>
> DX = $3f8
> AL = Data
> out(DX)
>
> In C it is like...
>
> a = (inportb(STATUS) & 0xF0);
>
> check out http://www.beyondlogic.org/spp/parallel.htm
>
> I can check up on this later today if you have not got the info you
> need by
> then
>
> Regards
>
> David Huisman
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Andy N1YEW
> Sent: Tuesday, 28 August 2001 4:05
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [PIC]: BIOS call to read from bidirectional parallel
> port?
>
>
> Is this in assembler or c?
>
> x=inb(port);
> outb(port,x);
>
> dont hold me to the inb and outb syntax... check it yourself...
>
> that should work..
> ----- Original Message -----
> From: "Harold M Hallikainen" <haroldhallikainen@JUNO.COM>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Monday, August 27, 2001 1:58 PM
> Subject: [PIC]: BIOS call to read from bidirectional parallel port?
>
>
> >         I'm using PSP mode on a PIC to interface to a PC parallel
> port. In
> the
> > PC application, I'm using BIOS interrupt 0x17 to send stuff to the
> PIC
> > thru the parallel port. My BIOS book is real old (1991) and make
> no
> > mention of bidirectional parallel ports. Is there a STANDARD BIOS
> call to
> > read from a parallel port?
> >
> > Harold
> >
> >
> > FCC Rules Online at http://hallikainen.com/FccRules
> > Lighting control for theatre and television at
> http://www.dovesystems.com
> >
> > ________________________________________________________________
> > GET INTERNET ACCESS FROM JUNO!
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FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

________________________________________________________________
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Join Juno today!  For your FREE software, visit:
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