Printer Setup (11.3.1.1.1)

[Marc Fonvieille]

On Tue, Oct 28, 2003 at 12:34:25PM +0200, Peter Pentchev wrote:
> 
> Errrr... I'm not sure it needed fixing :)  Rather, IMHO rev. 1.79 might
> need to be reverted.
> 
> Historically, parallel ports did indeed offer only one-way
> communication: the computer sent data to the printer, and that was it.
> Then things like EPP (the extended printer port) interface and friends
> were developed, and the parallel port grew two-way communication, too -
> this is exactly what the *last* sentence is talking about (EPP and ECP
> were standardized in IEEE 1284, http://www.fapo.com/ieee1284.htm for
> more info).
> 
> Serial port communications have always been two-way, AFAIK, albeit some
> of them were just half-duplex, so only one side could talk at a time.
>

Oh you're right, I just had that half-duplex in mind.  I always thought
serial printers used half-duplex.

> Thus, I think the text was correct as it was, before rev. 1.79 -
> parallel ports were once only capable of one-way communication, but with
> IEEE 1284 (EPP, ECP) they can do two-way now, while serial ports have
> always been capable of two-way communication.
> 

I reverted the commit and added EPP, ECP in the last sentence, it will
be less confusing.

Marc
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