This'd be in C. To output to the port (where BIOS does all handshaking),
I'm doing the following to output to the LPT:

void SendToDongle(data, lpt)
// Sends a byte to the dongle using BIOS print char.
  char data;                    // The byte we want to send
  char lpt;                             // LPT port to use
  {
    extern unsigned _rax, _rdx;
    _rax=data;                                          // Interrupt 17, function 0. AH=0, AL=data
    _rdx=lpt-1;                                 // Shift lpt port down to 0..2
    _doint(0x17);                                       // Go print it
  }

        I'd like to find a similar BIOS or DOS call to read a byte using byte
mode.

Thanks!

Harold


On Mon, 27 Aug 2001 14:04:31 -0400 Andy N1YEW <n1yew@SOFTHOME.NET>
writes:
> 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!
> > Juno offers FREE or PREMIUM Internet access for less!
> > Join Juno today!  For your FREE software, visit:
> > http://dl.www.juno.com/get/tagj.
> >
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> >
> >
>
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>

FCC Rules Online at http://hallikainen.com/FccRules
Lighting control for theatre and television at http://www.dovesystems.com

________________________________________________________________
GET INTERNET ACCESS FROM JUNO!
Juno offers FREE or PREMIUM Internet access for less!
Join Juno today!  For your FREE software, visit:
http://dl.www.juno.com/get/tagj.

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