An example of the scale, economics, and technology of core memory in the 1960s was the 256K 36-bit word (1.2 MiB) core memory unit installed on the PDP-6 at the MIT Artificial Intelligence Laboratory by 1967. This was considered "unimaginably huge" at the time, and nicknamed the "Moby Memory". It cost $380,000 ($0.04/bit) and was 69 inches wide, 50 inches tall, and 25 inches deep with its supporting circuitry (189 kilobits/cubic foot = 6.7 kilobits/litre). Its cycle time was 2.75 μs.