1 R6502ACE, gold mil spec ceramic part A = 2mhz C = Ceramic E = extended temperature range. I have held on to these spares for many years and used a few in some apple builds. It was never used outside of me testing it my tester. These are the hard to find gold ceramic 6502s used in Apple I's, Kim 1's and Pets. This is what you need if you are looking for a fancy gold ceramic 6502 for your apple build. They are the equivalent of the MOS6502, mos6502A, sy6502, and sy6502A. Rockwell made this cpuunder licensefrom MOS technology. The A is backwards compatible, runs at 2mhz instead of 1. Parts are in my own stock here in the USA we do not sell Chinese counterfeit junk.