M27C256B-10F1 UVEPROM by STMicroelectronics. Organistion: 32K x 8-Bit Access time: 100 nS Package: 28-pin windowed CERDIP Download STMicroelectronics M27C256B-10F1 .pdf datasheet: Status: NOS (New Old Stock) Individually tested components: YES RoHS compliant: no