High performance FPGA versions of popular microcontrollers. The purpose of these cores is to provide efficient FPGA replacements of standard microcontrollers. The cores use RAM and ROM inferring for both portability and high performance. Currently available cores are compatible with 90S1200 and 90S2313, 16C55 and 16F84, Z80 and T51. Typical performance for the AX8 and PPX16 cores range from 10 to 100 peek MIPS depending on the FPGA used. The T51 runs at up to about 50 peek MIPS.