Random access control apparatus and method for slide projector

Random access control apparatus for a slide projector that carries a slide tray and is responsive to predetermined encoded slide address signals in a first predetermined format comprising:

• manually operable means for entering slide address codes in a second predetermined format, said manually operable means including a plurality of entry devices, each of said plurality of entry devices representing a respective one of the numerals 0 through 9, each of said slide address codes being entered on said plurality of entry devices as numerical codes representing a predetermined number of slide positions in the range of 1 to n where n is greater than 10;
• a data transducing input;
• control means responsive to predetermined encoded slide address signals in said first predetermined format at said data transducing input for decoding said predetermined encoded slide address signals and for generating slide tray movement control signals, said control means comprising manual random access means directly responsive to actuation of said entry devices to enter said slide address codes in said second predetermined format on said manually operable means for generating said slide tray movement control signals, said manual random access means comprising means for sensing actuation of said entry devices;
• a data transducing output;
• and
• transport means responsive to said slide tray movement control signals for controlling the position of a slide tray, said control means further comprising encoding means operative in a program recording mode and responsive to said slide address codes entered on said manually operable means for generating encoded slide address signals at said data transducing output, each of said encoded slide address signals corresponding to a respective slide position of a slide tray and being encoded as a predetermined combination of audio tone bursts defining said first predetermined format.