name: x22c12 function: 256*4 CMOS Nonvolatile Static RAM package: Plastic DIP,CERDIP,18 manufacturer: Xicor +--()--+ a7 | 1 18| Vcc a4 | 2 17| a6 a3 | 3 16| a5 a2 | 4 15| i/o4 a1 | 5 14| i/o3 a0 | 6 13| i/o2 *cs | 7 12| i/o1 Vss | 8 11| *we *store | 9 10| *recall +------+ This pinout came from the Chipdir: http://www.chipdir.org/ name: x22c12 function: 256*4 CMOS Nonvolatile Static RAM package: SOIC,20 manufacturer: Xicor +--()--+ a7 | 1 20| Vcc a4 | 2 19| a6 a3 | 3 18| a5 a2 | 4 17| i/o4 a1 | 5 16| nc a0 | 6 15| nc *cs | 7 14| i/o3 Vss | 8 13| i/o2 *store | 9 12| i/o1 *recall |10 11| *we +------+ This pinout came from the Chipdir: http://www.chipdir.org/