X22C12 +---()---+ a7 | 1 18| Vcc a4 | 2 17| a6 a3 | 3 16| a5 a2 | 4 15| io4 a1 | 5 14| io3 a0 | 6 13| io2 /cs | 7 12| io1 /Vss | 8 11| /we /store | 9 10| /recall +--------+ function: Nonvolatile SRAM package: PlasticDIP, CerDIP manufacturer: Xicor