Path: utzoo!attcan!uunet!mcsun!ukc!edcastle!elee24
From: elee24@castle.ed.ac.uk (H Bruce)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Programming 83747(??) based parallel/serial IO cards.
Message-ID: <5446@castle.ed.ac.uk>
Date: 1 Aug 90 10:34:47 GMT
Organization: Dept. Electrical Engineering, Edinburgh University, Scotland, UK.
Lines: 25

I recently posted an article requesting info on reading data from the parallel
port. I recieved some informative replies which I will summarize.
However most of the info was valid for cards based on the 74 series logic.
As my card is not of this type I have not looked to deeply into the info
I am presenting.

* Five control lines can be used as input lines.

* The 8 output data lines can be used for input as well if a hardware mod is
  performed (see the most recent PC digest for more info). 
  The direction of the data can then be controlled by bit 5 of the 
  control register.

The card that I have is called a B-2010 IO card but has no manufacturer info.
It is from a clone (Elonex) so I expect there will be a few of them about. 
It supports two serial and two parallel ports.
It appears to be based on a PIA/UART chip labelled "CIC83747AZ 8828".

Does any one know if this chip can be programmed to act like a modified parallel
card as I mentioned above ?


Thanks,

Henry.