Re: [PARPORT] SIIG Dual Parallel Port card under RH 6.2

From: Tim Waugh (
Date: Mon Apr 08 2002 - 03:54:13 EDT

  • Next message: Jerry Mulchin: "Re: [PARPORT] SIIG Dual Parallel Port card under RH 6.2"

    On Fri, Apr 05, 2002 at 09:14:32PM -0800, Jerry Mulchin wrote:

    > But I don't want to use the ports for printers. Rather I want to
    > just use them for control of some hardware I'm designing. When I
    > installed the RH 6.2, I did not install any parallel port
    > support. Fortunately interrupts are not a requirement, so I don't
    > need to program for that. I also understand Linux 6.2 doesn't
    > support parallel port interrupts anyway.

    (It does, of course.)

    > 1.) Can I leave them at the ports the end up at when the system boots up?
    > They appear at 0xE800, 0XE400, 0xE000, and 0xDC00 and are defaulted
    > to EPP mode I believe. Or should I program the base addr registers to change
    > them to lower port address?

    Leave them there. But they might change when you change bits of
    hardware around.

    > 2.) Can I just program them for use in "user space" and use some of
    > the libraries out there that control paralle ports. One that I plan
    > to use is a library called "parapin". Parapin does support "ioperm",
    > but I added "iopl" to the library for the higher I/O addresses.

    In theory you could also use libieee1284, but that performs much
    better with newer kernels.


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