10x4 matrix keyboard using only portB

[aratti]

During the weekend I came to the conclusion that the project should be for 60 keys.
The reason is that it is simpler to workout a smaller keypad from a larger one. (at least in this case)

Just remove the unnecessary switches and diodes and you have the keypad already designed.

The software has also been changed a bit in order to work around the fact that 16F84A could not accomodate an array of 61 bytes.
So with this new solution I had it at work reducing also the code work space.

Now the software works with all combination of keypad from 4x1 to 4x15 (Rows x Columns)

I am attaching the file with the new version (Hardware & Software) sure that this will make life easier.
Al.