FACOM 6621A High-Speed Magnetic Drum Unit

The FACOM 6621A was a magnetic drum unit from Fujitsu which achieved high-capacity and high-speed transfer. It was completed in 1971. The FACOM 6622K and L magnetic drum units employed the same magnetic drum as this unit, and were also completed at this time. The 6621A employed a 4-bit parallel data transfer system, and achieved high-speed transfer of 1.2Mbyte/s-approximately 4 times that of the FACOM 6622K/L.