Bidirectional multispeed indexing control system

A method for providing bidirectional multispeed indexing control for a display unit having increment and decrement inputs so as to be controllable to sequentially index through an ordered list of discrete elements in response to selective actuation of first and second operator actuatable devices, comprising the steps of:

• responding to actuation of one of the devices for providing signals to a respective one of the increment and decrement inputs so as to control the display unit to index through the ordered list in a respective direction corresponding to which of the devices is actuated first;
• and
• controlling the indexing speed of the display unit in accordance with whether the other of the devices is also actuated.

A method for providing bidirectional multispeed indexing pulses on first and second output leads in response to selective actuation of first and second operator actuatable devices, comprising the steps of:

• responding to actuation of one of the devices for providing pulses to a respective one of the output leads corresponding to which of the devices is actuated first;
• and
• controlling the pulse rate of the indexing pulses in accordance with whether the other of the devices is also actuated.