Re: [PARPORT] Programming challenge!

Tim Waugh (
Mon, 19 Oct 1998 19:44:52 +0100 (BST)

On Mon, 19 Oct 1998, David Campbell wrote:

> Attached is a code fragment from the ppa driver modified to use parport calls
> rather than by direct IO. Direct IO limits the driver to PC style hardware,
> whereas parport calls allows for the driver to be generic for all hardware
> platforms. Your job is to adjust the C code such that the optimum assembler
> code is generated. Ideally this involves the minimum memory fetches to
> evaluate the parallel port address.

But how long does an outb take? I would have thought the four IO
instructions per loop would be the limiting factor.


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