Memory : MicroPower SRAMs 8K x 8 Static RAM From old datasheet system Single Supply RS232C line Driver/receiver(?????μ?o?RS232C ?o?????????¨???2???2??????) 8K X 8 STANDARD SRAM, 55 ns, PDSO28 Single Supply RS232C line Driver/receiver(?????μ?o?RS232C ?o?????????¨???2???2??????) 8K X 8 STANDARD SRAM, 70 ns, PDSO28 Single Supply RS232C line Driver/receiver(氓??莽?碌忙潞?RS232C 莽潞驴忙?露氓??氓?篓茂录?2氓??2忙?露茂录?)