A PCI-bus is added to a VESA local bus (VL-bus) computer system using a VL-bus/PCI-bus bridge. The VL-bus/PCI-bus bridge claims a VL-bus cycle by asserting LDEV# to the VL-bus/system-bus bridge. If no other VL-bus device claims the cycle as well, then the VL-bus/PCI-bus bridge translates the cycle...http://www.google.com/patents/US5790831?utm_source=gb-gplus-sharePatent US5790831 - VL-bus/PCI-bus bridge
