semi ot: cardreader connected to a PC

From: Lawrence LeMay <lemay_at_cs.umn.edu>
Date: Sat Feb 9 13:11:11 2002

You probably need a copy of the book "Parallel Port Complete", it explains
what can be done with all the versions of teh parallel port, and shows
how to program it from Visual Basic.

No, I dont happen to have a copy. I read Serial Port Complete once, I
imagine its very similar.

-Lawrence LeMay

>
> This question might be somewhat OT.
>
> I'm currently making a little interface comprised of 4 TTL IC's to let
> my
> punchcard reader work with a PC (Linux). I think I have the interface
> made as
> much close as possible with regards to the signals generated by the card
> reader,
> but I need some info on the parallel port itself.
> I have searched the web, but not all my question are answerd with
> regards to
> the possible usage of the control and status signals.
>
> What I need to know is if all the control signals can be controlled from
> a program (not sure if it will be a kernel device driver or a user
> driver).
> If so, I have better control over the reader, if not, it may make the
> interface
> a bit more complicated.
> BTW, the program will most likely use the parallel port in EPP mode, not
> in ECP mode.
>
> The reader is a CR11 aka the Documentation M200, and I found the user
> manual with
> very usable schematics on www.pdp8.net.
> I was also fortunately to find a supplier for the connector at the back,
> so I
> didn't have to change anything of it's orginality.
>
> Thanks,
>
> Ed
> --
>
Received on Sat Feb 09 2002 - 13:11:11 GMT