Editing VESA Local Bus (section)

{{short description|Expansion bus for 486 PCs}}
{{Infobox computer hardware bus
| name        = VLB
| fullname    = VESA Local Bus
| image       = KL Quick Technology SCSI-2 IDE FDC.jpg
| alt         = VLB card
| caption     = Multi-I/O-Controller with 1×IDE/SCSI-2/FDD/parallel/2×RS232/Game
| invent-date = {{Start date and age|1992}}
| invent-name = [[VESA]]
| super-name  = [[Peripheral Component Interconnect|PCI]]
| super-date  = 1993
| replaces    =
| width       = 32
| numdev      = 3<ref name="Infinite expansion">{{cite web |url=https://www.atarimagazines.com/compute/issue158/68_Infinite_expansion.php |title=Infinite expansion. (computer buses) |publisher=Atari Magazine, COMPUTE! ISSUE 158 / NOVEMBER 1993 / PAGE 68 |last=Schuytema |first=Paul |access-date=May 27, 2019}}</ref>
| speed       = 25–40&nbsp;MHz
| style       = p
| hotplug     = no
| external    = no
}}

The '''VESA Local Bus''' (usually abbreviated to '''VL-Bus''' or '''VLB''') is a short-lived [[expansion bus]] introduced during the [[i486]] generation of [[x86]] IBM-compatible [[personal computer]]s. Created by [[VESA]] (Video Electronics Standards Association), the VESA Local Bus worked alongside the then-dominant [[Industry Standard Architecture|ISA]] 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 [[memory-mapped I/O]] and [[Direct memory access|DMA]], while still using the familiar ISA bus to handle basic device duties such as interrupts and [[port-mapped I/O]]. Some high-end [[i386|386DX]] motherboards also had a VL-Bus slot.