ウィリアムス管
The first random access regenerative capacitor memory was the Williams tube (1947). As fitted to the first practical programmable digital computer, a single Williams tube held a total of 2560 bits, arranged in two 'pages'. One page was an array of thirty two 40-bit binary numbers, the capacity of a basic Williams-Kilburn Tube. The refresh rate required varied depending on the type of CRT used.