Well, I would probably use a F877, because there are more
code examples on the net. However, the F452 is easier to
learn if you are new to PICs.
For code examples try www.piclist.com and also
http://www.drzyzgula.org/bob/electronics/frtom.shtml
Fr. Tom McGahee has a good solid example of a
4x4 Keypad project half way down the page.
The F877 is a 40 pin device so you might not have to
multiplex depending on you requirements.
Also try to use topic tags E.G. [PIC]: , [EE]:

Good luck,
Kevin

On Sun, 22 Aug 2004, iain duncan wrote:

> I am a newbie to pics and electronics, though I have no problems with
> assembly programming. I get much more confused by what's going on
> outside the pic. I would like to interface four 4x4 keypads to one chip
> that will also do midi output, which i guess means multiplexing of some
> sort, is this likely to be a terribly difficult project? Can anyone tell
> me what other parts I will need to get more than one keypad into the
> pic, or point me at any good resources for this? Is there anyone on here
> who might have made a keypad-to-midi controller?
>
> Also, will it be possible in such a situation to write the firmware so
> that it can accept multiple simultaneous keypresses across the pads, or
> is that reall hard?
>
> Thanks
> iain
>
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