The Rare California Computer Systems CCS Model 2066 64K S-100 Bus DRAM Memory Board is a vintage computer memory board manufactured in the United States by California Computer Systems. This unit is compatible with S-100 buses and features 64K of DRAM memory. It is a sought-after collectible for vintage computing enthusiasts due to its rarity and historical significance in the evolution of computer technology. This product is a valuable addition to any vintage computing collection, offering a glimpse into the early days of computing in the United States.