VESA Local Bus

<p>The VESA Local Bus (usually abbreviated to VL-Bus or VLB) is a short-lived <a href="/facts/Expansion_bus/QkWAPnxJ">expansion bus</a> introduced during the <a href="/facts/I486/2zfEAXAw">i486</a> generation of <a href="/facts/X86/Kypq5fgu">x86</a> IBM-compatible <a href="/facts/Personal_computer/koaYfNce">personal computers</a>. Created by <a href="/facts/VESA/tWrcxDNt">VESA</a> (Video Electronics Standards Association), the VESA Local Bus worked alongside the then-dominant <a href="/facts/Industry_Standard_Architecture/5Rk4bjqB">ISA</a> bus to provide a standardized high-speed conduit intended primarily to accelerate video (graphics) operations. VLB provides a standardized fast path that add-in (video) card makers could tap for greatly accelerated <a href="/facts/Memory-mapped_I%2fO/PmLNFq01">memory-mapped I/O</a> and <a href="/facts/Direct_memory_access/DWuVgclV">DMA</a>, while still using the familiar ISA bus to handle basic device duties such as interrupts and <a href="/facts/Port-mapped_I%2fO/PmLNFq01">port-mapped I/O</a>. Some high-end <a href="/facts/I386/ag5eSgWv">386DX</a> motherboards also had a VL-Bus slot.
</p>

VESA Local Bus open-in-new

VESA Local Bus