Reading machine

A reading machine for providing a visual display of selected textual material comprising:

• addressable memory means for storing textual material in digital form, said memory means comprising a read only memory including output means for providing digital output signals of textual material at selected addresses in said memory means;
• addressing means for applying selected address signals to said memory means to cause said memory means to apply textual material at the corresponding selected addresses to said output means;
• text selection means for indicating textual material to be displayed;
• comparison means coupled to said output means, to said text selection means, and to said addressing means for inhibiting application of selected address signals from said addressing means to said memory means when the textual material at said output means corresponds with the textual material indicated by said text selection means;
• a second memory device, coupling means connected to said read only memory, to said second memory device and to said comparison means and capable of assuming a first state in which said read only memory is coupled to said comparison means and a second state in which said second memory device is coupled to said comparison means;
• control means for causing said coupling means alternatively to assume its first state or to assume its second state;
• and
• display means coupled to said output means for forming a visual display of textual material applied from said output means to said display means.