Apparatus and method for data entry and display

Display refresh means, comprising:

• storage means having a plurality of addressable data storage locations for storing data to be displayed;
• clock means for generating timing pulses;
• display address means synchronously driven by said clock means for sequentially retrieving data to be displayed from said storage means;
• control means synchronously driven by said clock means for gating retrieved data to sequential display elements and for establishing an initial correspondence between said display address counter means and said display elements;
• load means for loading data characters into sequential storage locations of said storage means and, with each said loading, for stepping the correspondence between said display address counter means and said display elements.

Keyboard entry apparatus for loading a display refresh store with data characters, comprising:

• clock means for generating timing pulses;
• control counter means driven by said clock means for generating a plurality of successive control states;
• a keyboard including a plurality of key means manually operable for entering data;
• scan means responsive to said control counter means for successively scanning the state of each key means and for providing a first signal when an operated key means is scanned;
• buffer means responsive to said first signal for buffering the contents of said control counter means;
• comparator means responsive to the second occurence of said first signal for comparing the timing states of said control counter means and said buffer means, and responsive to an equal comparison for loading the contents of said buffer means into a storage device.