Williams tube
The Williams tube or (more accurately) the Williams-Kilburn Tube (after Freddie Williams and coworker Tom Kilburn) was a cathode ray tube used to store electronic data.
When a dot is drawn on a cathode ray tube, the spot lasts for a time that depends on the type of phosphor used in the tube. Another side effect is that the area around this dot is slightly changed in electrical charge. By measuring the charge at that spot you have a simple form of memory that lasts for a time depending on the type of phosphor used.
Developed at the University of Manchester in England, it provided the medium on which the first ever electronically stored-memory program was written. Tom Kilburn wrote this 17 line program to calculate the highest factor of a number.
The Williams tube was regarded as extremely unreliable, and touchy. Most working installations had to be "tuned" by hand. In contrast, delay line memory was slower, but quite reliable. This is why delay lines were used in most machines that were regarded as successful.
External links
Referenced By
Auxiliary storage | Computer Storage | Computer generation | Computer memory | Core memory | Engineering Research Associates | File storage | History of computers | History of computing hardware | IAS machine | IBM 701 | List of electronics | List of electronics topics | MIT Whirlwind | Machester Mark I | Magnetic core memory | Manchester Mark 1 | Manchester Mark I | Project Whirlwind | Selectron tube | Storage media | Storage medium | UNIVAC 1103 | Whirlwind (Computer) | Whirlwind Computer
|
