The VESA Local Bus

The VESA Local Bus was mostly used in personal computers. VESA Local Bus worked alongside the ISA bus; it acted as a high-speed conduit for memory-mapped I/O and DMA, while the ISA bus handled interrupts and port-mapped I/O.A VLB slot itself was an extension of an existing ISA slot. Indeed, both VLB and ISA cards could be plugged into a VLB slot. The extended portion was usually colored a distinctive brown. This made VLB cards quite long, reminiscent of the expansion cards from the old XT days. The addition resembled a PCI slot.