Editing Apple Desktop Bus (section)

{{short description|Proprietary bit-serial peripheral bus}}
{{Use mdy dates|date=October 2013}}
{{More citations needed|date=October 2021}}
{{Infobox connector
|name=Apple Desktop Bus
|type=[[User interface|Human input device]] interface
|image=Apple ADB Keyboard.jpg
|logo=[[File:Apple Desktop Bus (icon).svg|frameless|class=skin-invert|upright=0.25]]
|caption=The Apple Desktop Bus icon and an early Apple Desktop Bus keyboard
|designer=Apple Computer
|design_date={{Start date and age|1986}}
|manufacturer=[[Apple Inc.|Apple Computer Inc.]]
|production_date=1986 to 1999
|superseded=[[RS-422]]/[[MOS Technology 6522|6522]] keyboard and mouse
|superseded_by=[[USB]] and [[IEEE 1394|FireWire]]
|superseded_by_date=1998–1999
|external=yes
|hotplug=occasional support
|length=
|width=
|height=
|data_signal=Bi-directional serial command stream
|data_bit_width=
|data_bandwidth=125&nbsp;kbit/s maximum <br> (~10&nbsp;kbit/s actual)
|data_devices=16 maximum <br> (~5 actual, 3 supported)
|data_style=Serial
|physical_connector=[[Mini-DIN]]
|num_pins=4
|pinout_image=[[Image:MiniDIN-4 Connector Pinout.svg|150px]]
|pinout_caption=Female socket from the front
|pin1=Data
|pin1_name=Apple Device Bus
|pin2=Power on
|pin2_name=PSW
|pin3=+5 volts power
|pin3_name=+5 V
|pin4=Ground
|pin4_name=GND
|pinout_notes=Same connector as [[S-Video]]
}}

'''Apple Desktop Bus (ADB)''' is a [[proprietary hardware|proprietary]]<ref>[https://developer.apple.com/legacy/library/technotes/hw/hw_01.html#Licensing "ADB - The Untold Story: Space Aliens Ate My Mouse", "Licensing" section] {{Webarchive|url=https://web.archive.org/web/20161227142619/https://developer.apple.com/legacy/library/technotes/hw/hw_01.html#Licensing |date=December 27, 2016 }}; see also [[#Patents|this page's Patent section.]]</ref> [[serial communication|bit-serial]] [[peripheral bus]] connecting low-speed devices to computers. It was introduced on the [[Apple IIGS|Apple II<small>GS</small>]] in 1986 as a way to support low-cost devices like keyboards and mice, enabling them to be connected together in a [[Daisy chain (electrical engineering)|daisy chain]] without the need for hubs or other devices. Apple Desktop Bus was quickly introduced on later [[Mac (computer)|Macintosh]] models, on later models of [[NeXT]] computers, and saw some other third-party use as well. Like the similar [[PS/2 port|PS/2 connector]] used in many PC-compatibles at the time, Apple Desktop Bus was rapidly replaced by [[USB]] as that system became popular in the late 1990s; the last external Apple Desktop Bus port on an Apple product was in 1999, though it remained as an internal-only bus on some Mac models into the 2000s.