Patent
1995-05-01
1998-08-25
Lee, Thomas C.
395834, 395823, 395162, G06F 1546, G09G 100
Patent
active
057992045
ABSTRACT:
A high-performance video controller is provided for a microprocessor-based computer having a bus, which has a plurality of slots for receiving slot connectors for peripheral-type devices, wherein (i) the bus is of the type imposing a single-device-per-slot limitation and (ii) the computer has a BIOS requiring on boot-up of the computer the presence of a standard video controller (e.g. VGA). The high-preformance controller includes (a) a connector arrangement having at least one slot connector, and (b) a standard-video-controller subsystem coupled to the connector arrangement and having a video output, and (c) an advanced graphics subsystem that is also coupled to the connector arrangement and that also has a video output. The connector arrangement may have a plurality of slot connectors so that the standard-video-controller subsystem is connected to a separate slot from the advanced graphics subsystem, which also has its own slot. The slot connectors and the circuit boards holding the components of the two subsystems may be mechanically rigidly linked to one another, spaced apart the same amount as the bus's slots, so that the two connectors can be plugged into parallel slots together. Some of the components of the advanced graphics subsystem may be placed on each of two circuit boards, while the standard-video-controller subsystem's component or components are preferably placed on just one of the two boards. The invention may include a switch configured to provide, at the system video output, the video output of the standard-video-controller subsystem during boot-up and otherwise the video output of the advanced graphics subsystem.
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Intergraph Corporation
Lee Thomas C.
Perveen Rehana
LandOfFree
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