Within the field of cable television or CATV, for example, an "'Addressability System "'or "'Addressable System "'may enable and control the distribution of cable services, creating a conditional access system ( CAS ), and allow the cable system to control and administer which cable products a customer may purchase and / or view.
32.
A hypothetical system using the 6845 could use a memory with 300-bit words, with each word encoding 24 pixels with 25-bits each, for a total addressability of 512 ki * 300 bits = 153600 kibibits = 150 mebibits = 18.75 mebibytes . ( Moreover, a system could overlay many planes of graphics and / or text, with each plane held in a separate memory and all planes accessed simultaneously using the addresses generated by the 6845 .)
