A hybrid computer interface for microprocessors
Joseph P. Heid · 1977
I/O Interfaces for Microprocessor Systems, designed for use in analog data environments, should be made as powerful as reasonably possible to compensate for the no-frills micro-processor. The Hybrid Computer Interface (HCI) is a multi-function module composed of standard off-the-shelf components that augments the micro-processor's capabilities by performing not only the standard AD & DA conversions but also all four arithmetic, and compare operations. Its central element is a programmable hybrid arithmetic unit (HAU) which performs these operations directly on both analog and digital operands. The HCI derives its program from the micro-processor memory and operates either as a pre-processing peripheral or as a self-sufficient processor independent of the micro-processor.