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I hope this will be of use to someone… I have written a port of OS uC/OS-II for the Dallas 80C390 processor in contiguous mode (the 16MB address space). The port supports Keil's PK51 version 7.08. The port supports both DPTR's if required. It also supports the Maths accelerator in one thread. Currently the port only supports the standard 8051 stack, and does not support the extended stack of the Dallas 80C390. The website for the OS port is http://www.ucos-ii.com I thought this might be of interest, as this processor only has a few OS ports that support the contiguous mode. Stuart Wright