Re: [PARPORT] ECP, DMA, driver writing

From: Peter Pregler (
Date: Fri Jun 23 2000 - 18:16:48 EDT

  • Next message: Peter Pregler: "Re: [PARPORT] ECP, DMA, driver writing"

    On Fri, Jun 23, 2000 at 01:58:11PM -0700, Richard Stover wrote:
    > fast as 1 microsecond per byte. But a parallel port on the ISA bus
    > just doesn't run this fast. The best I've seen is about 2 microseconds
    > per byte (500kbyte per second). It would be nice to know if there
    > are some motherboards that can go faster. (We're now planning a custom
    > PCI board.)

    I was told by the windows-driver writers that they could get about
    800kbyte per second with a special DMA transfer mode in their parport
    webcam driver. Though looking at the windows-code that must be for a
    special chip-set. I can sort out the ID if you like. I was never able
    to get more than the 500kb you quote on my asus-onboard parport.


    Even the thought that a ship was waiting to take him back to Earth
    did not wipe out the sense of loss he felt at that moment.

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