Zenith Data Systems Corporation

Clark L Buxton

Robert A Kohtz

Mark J Foster

Saifee Fakruddin

Jeff Schindler

An enhanced parallel port interface increases the bandwidth of a standard parallel port connector while at the same time maintaining backward compatibility with a standard parallel port interface. In order to increase the data transfer rate, the software overhead is substantially reduced by hardware generated signals. As such, the desirability of using a parallel port bus expansion is greatly increased.

Control system for a multiple mode standard parallel port for a personal

A computer system as provided with an internal flash ROM which includes the BIOS. In the event the flash ROM becomes corrupt, a special purpose interface allows for mode switching of a standard parallel port from a standard peripheral interface, such as a printer interface to a special purpose interface to enable the BIOS to be executed from an external ROM or another computer connected to the parallel port.

System for providing for a parallel port with standard signals and a

A computer bus interface suited to connecting an expansion bus to a computer's internal bus. The interface is capable of selecting and deselecting any devices coupled to the expansion bus by enabling and disabling buffers which intercept signals between the expansion bus and the internal bus.

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St. Joseph, MI, United States of America

Clark L Buxton