Sun have published a technical report discussing a VM called Spotless which is designed for 3Com's palmpilot. There have always been major obstacles to putting real Java on the Palm, the least of which is the limited memory available. This VM runs in about 30K of memory and implements the full bytecode set and garbage collection. The thread scheduler is implemented to switch threads based on the number of bytecodes the current thread has executed. For the Palm a small class library has been created to allow access to som palm-specific features. (The paper is only available as postscript or PDF)