Convergent Technologies, Inc.

Michael Ramsay

Leroy B Keely

Diab E Freige

Richard W Lowenthal

Drew S Hoffman

John J Lockwood

Larke E Reeber

A page mode memory controller for a multi-plane color video display providing three bits/pixel corresponding to three page partitioning in each of sixteen 64K dynamic RAMs is described. The three bits/pixel are routed to a color lookup table to provide a choice of eight colors from a palette of 64 colors. Graphic display information is combined with alphanumeric video information on a pixel-by-pixel basis. The combined graphic/alphanumeric information is then converted from a digital signal to an analog signal. Page mode reads access three color planes for video display cycles using a counter for the two least significant memory column address bits. To create the displayed image, vectors are drawn three times, once at each plane.

Multi-plane page mode video memory controller

A power distribution system intended for use in a highly modular desk top computer system is disclosed. The invention provides a programmable modular DC power supply including a power module that produces a first fixed regulated DC voltage which is coupled from the power module to a power bus. Thereafter the first voltage is distributed to a plurality of DC-to-DC convertors, each of which is operable to change the first DC voltage to a second regulated DC voltage selected from a plurality of programmed voltage values.

Modular power supply system

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Los Altos, CA, United States of America

Michael Ramsay