On 10/26/2012 04:52 PM, Paul_Koning at Dell.com wrote: The 2.11BSD lib looks leaner, and I am using it in my pet OS project (I pick the pieces I need "on the run", I have not done a complete port... yet). If the above suggestion doesn't get you anywhere, perhaps avrlibc could be hacked into a PDP-11 library. All of the hardware support will have to be ripped out of course, but there are nice tight implementations of generic library functions in there. I took a look at that. It seems to be largely assembly code, which makes it not very helpful. I've lifted more than a few routines from it, and they've all been C. Guess I just got lucky. Sorry for the false start. -Dave -- Dave McGuire, AK4HZ New Kensington, PA