On Wed, Jan 29, 2003 at 11:27:36PM +0000, Joe Lang wrote:
> Really?
> How does one use ppdev...like /dev/ports?
Read the documentation (I actually wrote some).
> What if there are 2 or more parallel adaptors?
/dev/parport0, /dev/parport1, etc.
> > The kernel figures this out by guessing, largely.
> Guessing?
> You are kidding...right?
Not really. Take a look at the code. It guesses an address, and then
pokes it to see if it behaves like a parallel port. It's quite easy
to guess the addresses: by far the most common are 0x278, 0x378 and
0x3bc. For PCI cards of course it's a lot easier.
> How much other guessing is done in Linux?
Most ISA devices have to be probed like that.
Tim.
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