National Semiconductor Corp has begun sampling its third generation 32-bit microprocessor, the NS32532, which is claimed to offer between 8 MIPS and 10 MIPS sustained performance. The company also introduced a 32-bit board level system based on the VMEbus running Unix System V.3 for evaluation and as a native debug and execution environment for programs developed on a host computer. NatSemi expects a number of systems integrators to build Unix-based 64 to 200 user systems with the VME532 and says a number of companies that traditionally used the Motorola 68000 series are prep-aring to switch over to the 32532.