Xerox Corporation

Apple Inc.

Lyle E Morris

Kai C Sun

Chuo-Kee Bo

A crosspoint encoder having a n-key rollover data collection system in which all keystrokes are recognized. A phantom key detection routine detects phantom key conditions and provides for temporary storage of subsequent keystrokes until the phantom condition is removed thus ensuring uninterrupted recordation of all keystrokes.

Keyboard crosspoint encoder having pseudo-n-key rollover

A print wheel mounting means. The print wheel has pivot posts formed integrally thereon. The pivot posts are spring-locked into channels in a connector attached to the print wheel drive shaft. The connector thus positions the print wheel to be pivoted onto the print wheel drive shaft.

Print wheel mounting means

A power amplifier is disclosed for controlling the current flow through a load. The power amplifier includes a plurality of switching elements connected in bridge fashion with the load and a first predetermined power source for coupling the load across alternate output terminals of the power source in accordance with the levels of a plurality of control signals respectively applied to the plurality of switching elements. Circuitry is coupled to a second predetermined power source for generating the control signals. Logic circuitry, when enabled, is capable of coupling each of the control signals to the respective switching element. A power monitor circuit compares the voltage level of the second power source with a predetermined reference potential and generates a current disable signal when the voltage level is less than the reference potential. A disable circuit coupled to the power monitor circuit disables the coupling circuit in response to the presence of the current disable signal whereby further current flow through the load is inhibited.

Growing community of inventors

San Ramon, CA, United States of America

Lyle E Morris