photodigital memory

A memory consisting of photographic film on which data is written by laser beam or focused light beam in the form of exposed dots (1bits) and unexposed areas of dot size (obits). When the film is developed, it becomes a permanent readonly memory.; 利用激光束或聚焦光束將數據寫入照象膠片而形成的存儲單元。 凡曝過光的點作為二進制1,未曝光區域的點作為二進制0。在膠片顯影后變成永久性只讀 存儲器。