First of all, there is no problem discussing programming topics on this list so don't be concerned about that. Secondly, I agree with Luke the source for the dtlk module which you can find in your linux source tree under drivers/char/dtlk.c is a good place to start if you want info. As Luke also points out however it is a complete driver therefore there is no need to write your own other than for the pure joy of it. O'Reilly has quite a few books on writing drivers under gnu/linux and at least one book on the linux kernel internals both good reads. You can also look at the speakup drivers for the DoubleTalk and DECTalk which will also give you more insight so there is a lot of information available. Now to answer your specific issue, to access any hardware as you have surmised one must register the request to talk to that hardware with the appropriate registration routines for the hardware you wish to address. You will see how that is done in all of the above mentioned code routines. Kirk -- Kirk Reiser The Computer Braille Facility e-mail: kirk at braille.uwo.ca University of Western Ontario phone: (519) 661-3061
