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Re: [Tlf-devel] parallel port confusion

From: Joop Stakenborg
Subject: Re: [Tlf-devel] parallel port confusion
Date: Wed, 09 Apr 2003 17:02:43 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3) Gecko/20030327 Debian/1.3-4

rein couperus PA0RCT wrote:

On Tuesday 08 April 2003 20:36, Joop Stakenborg wrote:
I am looking into adding more parallel ports to cwdaemon.
Linux seems to support 3 parallel ports with io-addresses of:

/dev/lp0 = 0x3bc
/dev/lp1 = 0x378
/dev/lp2 = 0x278

See the Linux Printing HOWTO, chapter 3.

I have always thought that the first printer port (lp0) is the default
port, but this seems not the case. The default is lp1, using 0x378 as
an I/O address.

Depending on your hardware, lp0 or lp1 could be the default port.
Anyone have experience with this?

It looks like I need to change the default port in cwdaemon to lp1
if I am correct.

you are correct, the default is 0x378

Done some more investigation....
It appears the Printing HOWTO is outdated. For 2.2 and 2.4 kernels the
following scheme applies:

/dev/lp0 = 0x378 = default printer port
/dev/lp1 = 0x278

So we were right after all. Wolf explained to me in a private mail that
0x3bc was used on some old hardware.



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