Overview COrnell Pre-emptive Operating System Fully Pre-emptive Supports Tasks w/Hard & Soft Deadlines, Periodic & Aperiodic ~1% overhead w/o context switches, varies w/program otherwise Simple Interface, simplifies programming Supports Locks & Shared Memory Allows use of all I/O Registers and resources except Timer 0 Most Timing Can be Handled Directly by Operating System Consumes ~75% of flash memory (3000 words) on Atmel 8515 Requires only ~3k-4k RAM Designed for use with Codevision