banging a printer port



Any idea about the rate we could bit-bang write to a printer port
under Linux?

I tried a PowerBasic (DOS) loop on Windows and got a bit over 500 KHz,
but I don't know if my OUT instructions are actually working, or if
Windows is trapping the calls and emulating. Under Linux, we'll be
doing real OUTs.

I'm thinking of configuring a Xilinx FPGA from a parallel (printer)
connector. Bit-banging would only take 3 wires (prog_b, cclk, data)
and two writes per bit, but with 4M bits to bang, I wouldn't like it
to take too too long.

John

.

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