ウィリアムス管
Memory was implemented using a variety of technologies over the lifetime of the R1. Originally a cathode ray tube or "Williams tube" array, RCA core memory was introduced in 1966, followed by Ampex core memory in 1967. Following those two upgrades, the R1 had reached its full 32k word capacity, although the original electrostatic memory was soon decommissioned due to falling reliability in its old age.