MSM51100A-80R 1Mb 180nS Dynamic RAM (DRAM) by OKI. Organisation: 1,048576 word x 1-Bit Speed: 80ns Access / 120nS cycle Package: 18-DIP simply marked: M51100A-80R Download OKI MSM51100A-80R .pdf datasheet: Status: NOS (New Old Stock) Individually tested components: YES .... intensive 16 minutes, 7-pass test routine. RoHS compliant: no