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.