Re: Minimal write-only slave PCI board?

On 10 Oct 2003 21:15:07 +0200, [EMAIL PROTECTED] (Mike) wrote:

>Hi!
>I'd like to make a PCB for a minimal, write-only slave PCI
>board, just to output some data.
>
>I thought about the following, to reach the "minimal" goal:
>
>Use only addresses, do not perform a full data write cycle.
>
>If I choose an address range, e.g.:
>
>0xABCDxxxx where ABCD addresses the board, and xxxx is my data,
>by intercepting the 0xABCD part of the PCI bus I may latch the
>rest of the address, that will be my data.
>
>At the PC side, it will mean that any write at the address
>0xABCDxxxx will send the data xxxx to my board.
>
>Is this doable?
>
>What should I do/need exactly to implement the above?

Quick-and-(not very)-dirty: get a parallel printer interface.  Most
such cards can be set to use the port your printer isn't using.  This
also simplifies the software;  your application can just pretend it's
writing to LPT2 or LPT3.  I've seen these cards at flea markets.