There are printers (such as those available from digikey) which have no
controller or logic, and involve telling the printer which way to move the
motor(s) and operate the head and other guts.  The controllers are sold
seperately.

I thought that was what he was talking about when he said parallel...

-Adam

David VanHorn wrote:
>
> >
> > > Are all devices of this nature parallel?
> > > and if so what code and I/O overhead is needed.
> >
> >Certainly not.  Serial based receipt printers are quite common.
>
> I missed the meaning of this the first time around.
>
> All non-PC receipt printers, except for a very few on specialized systems,
> are serial.
>
> You will likely need to learn to emulate a verifone P-250, which is itself
> a broken emulation of an epson printer. Also some of the commands are
> improperly documented, and even the P-250's bugs are used by some
> customers, so you'll have to emulate those as well.
>
> A couple years ago, I wrote a test suite in a Tranz-330 to test P250
> emulation. I may still have the code.
>
> Buy a couple cases of paper :)
>
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