Re: writing a parallel port driver to support external hardware

Russell Berry (
Thu, 25 Apr 1996 20:26:07 -0700

Tracy R. Reed wrote:
> On Tue, 23 Apr 1996, Richard A. Reitmeyer wrote:
> > Some people here are in the process of building a small robot, and have
> > decided to use a parallel port interface because the hardware's
> > easier that way. The tricky part is that now they want to make it
> > controllable from a Linux machine, and I think that means writing
> > a parallel port device driver. I've never written a device driver
> > and I barely know more than they do, so I wanted to ask:
> Hmm...Why parallel? Sounds like a pain. Many good microcontrollers have
> serial I/O built into them. I know most of the PIC and 68hc11 do. That
> would be much simpler in terms of hardware and software. No need to write
> special hardware drivers. Actually, even in parallel, if all you want to
> do is send data, just dump the appropriate but streams to /dev/lpt1 or
> whatever to make the robot do what you need it to do. No need for special
> hardware drivers.
> ------------------------------------------------------------------------> Tracy Reed IRC-Maelcum
> Check out DALnet! The best IRC network around:
> "She moves in mysterious ways..."This brings to mind a question I posed a while back that no one seemed to
want to deal with. Why are there no drivers for the parallel port tape
drives? These are some of the least expensive drives around. Is anyone
working on anything like that? Or is the parallel port so (un)standard
that you can't match hardware for a stable driver?