2732A +----o----+ A7 | 1 24| Vcc A6 | 2 23| A8 A5 | 3 22| A9 A4 | 4 21| A11 A3 | 5 20| Vpp/G (output enable/prog supply) A2 | 6 19| A10 A1 | 7 18| /E (chip enable) A0 | 8 17| Q7 Q0 | 9 16| Q6 Q1 |10 15| Q5 Q2 |11 14| Q4 Vss |12 13| Q3 +---------+ /E is basically a chip enable pin. Vpp/G is an output enable type pin. To read a 2732A, both /E and Vpp/G must be low. --------------------------------------------------------------------------- I believe the above to be accurate, but I need to know now the differences between the 2732 and 2732A. I think it has to do with programming voltages only, but I cannot remember. I also think that once the part is programmed, it is pin compatible for READs with the 2732A. I guess what I am asking for is the pinout for a 2732 (not 2732A) and how it differs from a 2732A. Thanks in advance again for all the help. -- Best Regards, Jim Ranlett Adapted by WJvG