Since my last posting, the p/n has been changed for the Version 6 EPROM. It is G1093217 and the material description is: IC M27C256B-15F1 (V6) Vertex Standard can be reached at 714-827-7600 X 6800. The part is under $13. My installation was successful. 73, Jim, K1PX K1PX at msn.com