MK4564N-25 64K DRAM by Mostek. Organisation: 65536 word x 1-Bit Access time: 250 nS Package: 16-DIP Download Mostek MK4564N (not -25 variant) .pdf datasheet: Status: NOS (New old stock) Individually Tested components: YES note: due to age (37 years! ) , tarnished pins have been expertly polished prior to testing. RoHS compliant: no