Why not get a PCI parallel port card?
Norm
> -----Original Message-----
> From: C. W. Wright [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, March 25, 1999 9:33 PM
> To: Wesley G Zanardelli
> Cc: RTLinux Newsgroup
> Subject: Re: [rtl] LPT Access Time
>
> > I am trying to send a pulse on on of the data pins of the parallel port
> in a
> > real-time task. This takes 2 write operations (1.4 uS each). I am
> looking for
>
> It's the ISA bus speed that's causing the problem. The best solution
> would be to get a PCI protoboard ( www.digikey.com ) and send the pulse
> that way. Another way is to use the already formed ~iowr or ~iord line
> from the ISA bus properly gated by a designated address decoder. This
> will generate a negative going pulse abt 200ns wide I think. You will
> only need to send one outb instruction too, since it causes a complete
> pulse. You can "tweek" the bus control chips to "high speed"
> "on-the-fly" just before you issue the outb, and back to normal afterward.
> I've used this method to speed the normally 8mhz bus clock up to 16mhz or
> higher during selected ISA I/O operations.
>
> The ISA I/O speed is terrible.
>
> -C. W. Wright
>
>
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