Re: [PARPORT] EPP programming

From: Leandro Santi (
Date: Mon Mar 01 1999 - 14:23:54 EST

  • Next message: Tim Waugh: "Re: [PARPORT] EPP programming"

    Try these:

    those are links to a number of i/o chips that the pc uses to interface to the paralell port (my soyo 6ba motherboard has an ite 8671f i/o chip). there's a detailed explanation of all the epp registers and timing on the PDFs (yes, i know, those are propietary stuff and not standards).

    btw, does anyone knows where to get a copy of the IEEE1284 spec?

    Leandro Santi

    At 11:24 AM 2/23/00 -0400, you wrote:
    >I am very new to parallel port programming and am trying to program the
    >port to interface a small digital b/w camera(384x288 pixels). I started
    >by programming the Standard Parallel Port, however, i realize that my
    >data lines must be bidirectional so I have been reading about using the
    >EPP mode. My camera has 8 data lines and four separate address lines so
    >I've already built an external latch for this problem. I don't want to
    >try anything before knowing exactly hoe the handshaking works... I wrote a
    >c program to perform both read and write cycles, but then I read that the
    >hardware does all the work and to initate the EPP cycle the software needs
    >only to write one I/O operation to the register in question. Can anyone
    >clarify this for me, or tell me where I might find more information?
    >Also, to actually have the port in EPP mode is it enough just to define
    >the base+3 - base+7 memory allocations?
    >I apologize if my questions are relatively simplistic, but it is hard to
    >find the appropriate information when surrounded by so much of it.
    >Beth Furey
    >fax: 902.423.5906
    >phone: 902.494.6044
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