Re: capture incoming messages on the parallel port

From: Robert M. Riches Jr. (spamtrap42_at_verizon.net)
Date: 11/08/05 

Date: Tue, 08 Nov 2005 04:44:23 GMT

On 2005-11-08, Michael Black <et472@FreeNet.Carleton.CA> wrote:
>
> The issue is twofold, as always. Hardware has to be two way; this
> wasn't the case for the parallel port in the early days of the "IBM PC",
> but in more recent years, especially as higher integration came into
> play, it tends to be standard. Offhand, I don't know whether the
> cable is different; that seems a tad off because most cables I've seen
> fill out all the pins.
>
> But then there is the software. What purpose would it serve to have
> a two way driver for a printer port? I briefly used a serial Macintosh
> inkjet with Linux, and the driver was two way, but it needed that because
> it needed some info from the printer that came on the serial data line.
> But virtually no printer needs to send data to the computer, the handshake
> lines take care of that. If there's no need for receiving data, then
> why would someone go to the trouble of making the printer port two way?
>
> That's not to say there isn't some driver around that will listen to
> the parallel port and handle data coming in. I would expect there to
> be something like that, because there are lots of uses for that sort
> of thing. But not a printer driver.

You just jogged my memory with more evidence that a
computer's parallel port can receive data. When I had a
parallel connection between an inkjet printer and my old
Alpha machine, I could use the Epson utility to query the
printer to find out how much ink was left. That used the
standard printer driver kernel module.

Robert Riches
spamtrap42@verizon.net
(Yes, that is one of my email addresses.)

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