1) John: "The 82C55 is not bit addressable", last I looked it was. What do you mean?
2) Mohit: The method described by Henk is the "standard way" I use it, only in cases where you are at a program crash or some such would I attempt to read the actual port latch status. This can be done by the method described in http://www-us.semiconductors.philips.com/acrobat/v...WARE_1.pdf on page 5.

Have fun,

Erik