The HPK2-3 processor card is an early LCN processor based on the Motorola 68020, with 3 MW of memory. For most node applications it is used with EMEM or QMEM cards for additional memory.

This processor no longer in widespread use, having been replaced by the K4LCN-4, K4LCN-8, and K4LCN-16 in most current LCN systems.