Keypad computer mouse emulation system

BRIEF DESCRIPTION OF THE DRAWINGS

a) FIG. 1 is a block diagram of the mouse emulation keypad system of this invention.

b) FIG. 2 is a flow chart of the main computer program and comprises two sheets divided into FIGS. 2-A and 2-B respectively.

c) FIG. 3 is flow chart of the interrupt routine interfaced to the main computer program and operating under the control of said main computer program.

d) FIG. 4 is a circuit diagram of the mouse emulation keypad and comprises FIGS. 4A through 4-D on a single sheet.

e) FIG. 5 is a graph of cursor rate along Y-axis against arrow key depressed time along x-axis.

f) FIG. 6 is a typical layout of the six-backlit keys of the keypad of this invention.