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From: mlelstv@immd4.informatik.uni-erlangen.de (Michael van Elst )
Newsgroups: comp.sys.amiga
Subject: Re: Need parallel port drive source...
Message-ID: <586@medusa.informatik.uni-erlangen.de>
Date: 20 Nov 89 13:56:18 GMT
References: <1892@zehntel.UUCP>
Organization: IMMD IV, University of Erlangen, W-Germany
Lines: 21

donw@zehntel (Don White) writes:

> Does anyone have source to the parallel port device? I have a parallel
> attachment which does robot control and I want efficiency.  So I would
> like to make a patch to the driver. I THINK I need every piece of code 
> and Lattice linking instructions. Do I?  

You won't need any change to the parallel.device just to get control over
the parallel port.

The hardware (i.e., one of the CIAs) is arbitrated via the misc.resource,
you can easily grab the port and noone can interfere. You can get the
interrupt line (ACK line from your printer) and even get the serial
shift register via the ciab.resource.

I've connected a GAL programmer to my printer port and use this method
to access all control lines.

				Michael van Elst

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