John Hansen wrote:

> I decide to try Steve Lowther's code and schematic for a 16C84 hooked to a
> keyboard and an LCD display.  When in doubt, start with something you know
> works, I figured.  I wired it up on a protoboard and burned the chip. He
> uses B0 for clock (using it as an interrupt) and A4 for data.  It produces
> the same 0x10 that I was getting from my code.  Also, the other two
> keyboards don't work on his code either, leading me to believe that Mark is
> right, no reset is required (Steve's source code doesn't show any).  Well,
> the bottom line is that my code seems to be producing the same results as
> his.  I conclude that there must be a problem with the hardware somewhere,
> yet I've followed his schematic.  I wonder if the fact that I get a
> different value from pin B0 and A4 provide any clues.  There is no
> variability in the results produced: I always get 0x10 on A4 and 0x18 on B0.
>
> Once again any thoughts would be appreciated.

There is a heap of info at:
http://www.dontronics.com/dt102.html

includes source code.
this may help you.

Don McKenzie    mailto:don@dontronics.com      http://www.dontronics.com

The World's Largest Range of Atmel/AVR  & PICmicro Hardware and Software
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html
The Little "rAVeR!" AVR & Basic Kit http://www.dontronics.com/dt006.html