Help with simple Device Driver for ISC

[HANSON JEFFREY ALLAN]

Hello netters,

I have been given the task of writing a device driver for a digital i/o
board to be used under ISC 2.2 . I have no device driver writing experience
which is why I am posting this request. I am looking for :

	1. good advice (always welcome)

	2. possibly some code segments of examples of similar drivers

	3. or even a sample driver of a similar device.


I realize as devices go that this is relativley simple but my lack of 
experience with drivers makes me uncomfortable just 'diving in'.
I have looked through the ISC Integrated Software Development Guide but would
feel more comfortable after seeing some examples.  The device is a RTI-817 
card made by Analog Devices and is a 24-bit channel which can be divided into 
(3) 8 bit ports. Each port can be either input or output (hardware selectable).
One port supports an interrupt when the inputs on it have changed. I would like
to have read capabilities for one port and write for the other 2. Any
experience/advice which anyone would like to share will be much appreciated.
The card occupies an 8-bit bus slot also.

Thanks,
Jeff Hanson

hanson at tramp.colorado.edu