In the early years of Castle Amber, the company focussed on development of software and hardware for RISC workstations created by Acorn Ltd.
Successors of the ARM processor, initially developed by Acorn in-house, are nowadays in use in a wide range of appliances like PDAs, routers, cell phones, etc. The efficient instruction set and the very low energy consumption have contributed to the success of this RISC processor family.