RE: [PARPORT] data rates and interrupt frequency of parport

From: Dmitri Katchalov (
Date: Tue Oct 30 2001 - 23:18:11 EST

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    >===== Original Message From =====
    >On Sun, 28 Oct 2001 22:30:36 +0000, Tim Waugh <> 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 (go to motion control ICs section)
    and there are plenty of others.


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