16f88 problems

[languer]

The following may correct any R-W-M mismatch condition, but it is a little risky to write to the output latch (even if not an output) when it maybe directly connected to +5V (through the SW):

PortA = 0
PortB = 0

Would an initial read to the port, before the actual loop, do the same?

The RBPU should be disabled by default (unless PBP assigns it behind the scenes).

For these reasons I would have the port connected to +5V through a 10k resistor; and the switch would connect the port to GND (may be through 1k for protection).

The following post may give some ideas (not identical, but helps illustrate): http://www.picbasic.co.uk/forum/show...t=weak+pull-up