Hi, The 2716 requires the following signals/voltage for programming:- Read Operation /EP (Pin 18) => Logic 0 /G (Pin 20) => Logic 0 Vpp (Pin 23) => +5V DC Program Operation /EP (Pin 18) => Logic 0 to Logic 1 50mS (approx) pulse, per location to be programmed /G (Pin 20) => Logic 1 Vpp (Pin 23) => +25V DC Verify Operation /EP (Pin 18) => Logic 0 /G (Pin 20) => Logic 0 Vpp (Pin 23) => +25V DC or +5V DC To program one, the sequence is... 1 - Raise Vpp to +25V DC 2 - /EP at Logic 0 3 - Raise /G to Logic 1 4 - Supply Address information 5 - Supply data information 6 - Provide a Logic 0 to Logic 1 45-55mS pulse on /EP 7 - Drop /G to Logic 0 8 - Read data to verify the contents 9 - Get next address location, and go back to step 3 Do this for the required locations you want to program/verfiy. When finished burning/verifying the 2716, you can drop Vpp back to +5V DC for normal read operations. Seeyuzz River