name: CY7C172A function: 4K x 4 Static RAM with Separate I/o package: DIP24 / SOJ24,24 manufacturer: Cypress +--()--+ A4 | 1 24| Vcc A5 | 2 23| A3 A6 | 3 22| A2 A7 | 4 21| A1 A8 | 5 20| A0 A9 | 6 19| I0 A10 | 7 18| I1 A11 | 8 17| O0 I3 | 9 16| O1 I2 |10 15| O2 *CE |11 14| O3 GND |12 13| *WE +------+ This pinout came from the Chipdir: http://www.chipdir.org/