>===== Original Message From D.Strauss@motorola.com =====
>On Sun, 28 Oct 2001 22:30:36 +0000, Tim Waugh <twaugh@redhat.com> wrote:
>>
>> On Sun, Oct 28, 2001 at 07:34:39PM +0000, matt wrote:
>>
>> > I've found various information saying that my parallel port
>> > should support data rates at up to 2MB/s. I think that this
>> > must be DMA and hardware helped - so what is a rate that
>> > I could expect through 1 pins, with the minimum latency
>> > (ie no DMA or buffering)?
You ought to consider a hardware solution. PCs are not good for
counting pulses no matter what OS you're using. There are plenty of
ready-made ISA, PCI and PCMCIA i/o cards (do a google search on
"quadrature encoder") or you can DIY with specialised encoder IC,
PIC or even with 74xx logic. Have a look at
http://www.usdigital.com/products/ls7166/
http://www.semiconductor.agilent.com (go to motion control ICs section)
and there are plenty of others.
Regards,
Dmitri
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