Inconsistent output on a 4x4 matrix keypad

[markcadcam]

I believe I found the problem. This circuit was designed for a 4Mz crystal and I am running it at 20Mz. I added a 'PAUSE 1" after the line 'TRISB = (DCD Row) ^ ff' to slow it down and this seems to of fixed the problem.

Thanks for everbodys help,
Mark

[mister_e]

That's what @ GOTO $+2 did... but 2500 times faster

also try with shorter PAUSEUS. PAUSEUS 5 should also work...