I'm happy that my comments spawned some healthy discussion. I think I should have qualified my statement regarding 'c' a little more! Given the job of port a large asm project vs a large 'c' project, I dare say most of us would groan heavily if it were asm! However, we seem to agree that a well written 'c' project is easier to port.

I think my experiences seem to be similar to Peter's - change the hardware dependant stuff and a bit of search and replace and most of the work is done. Similarly, most of my stuff has been 8051 and AVR where the peripherals are similar in concept and operation so moving across is little more than changing the names and the method of bit access. I've had some fun of late moving to the LPC21xx series where the peripherals are quite different and not completely documented in many cases. On the other hand we have Jan's case where the compiler implementation brought up some undesired effects. All this is good stuff to consider when writing code, especially for beginners. I think this is one of the few subjects where it has been highly focussed and each submission is gold.

Andy - I rapped myself over the knuckles (no flagellation though) for my poor use of English. Not double plus good!