Hi, Regarding Contiki there are three dependencies: 1. The Uthernet card doesn't work with the original 6502 CPU because of some signal timing issue. You need at least a 6502A. 2. The Contiki 2.x C code was compiled for the 65C02 CPU and makes use of their additional opcodes. 3. The Contiki GUI makes use of Mousetext characters. Regards, Oliver