Computer bus interconnection device

Details Computer bus interconnection device Computer bus interconnection device

1991-05-06

1992-01-21

Lee, Thomas C.

Boots, shoes, and leggings

364240, 3642401, 3642402, 3642405, 3642399, 36424292, 364DIG1, G60F 1340, G60F 1314, G60F 1338

Patent

active

050832590

ABSTRACT:
The interconnection device attaches to the VMEbus backplane and implements a fully functional AT-compatible computer which is capable of acting as either a master or a slave on the VMEbus. The interconnection device defines a 64K window within the real mode address space of the AT computer which is mapped onto the VMEbus to allow the AT computer to access the VMEbus when in real mode. When the AT computer is in protected mode, addresses above the real mode/protected mode boundary are mapped onto the VMEbus address space. The interface apparatus modifies the AT architecture direct memory addressing (DMA) scheme to allow the microprocessor of the AT computer to act as a VMEbus slave when predefined addresses on the VMEbus are accessed.

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