Editing Atari interface (section)

===Atari joysticks===
[[Atari]]'s joystick standard was introduced with the ''Atari VCS'' (''Atari 2600'' after 1982) and was then used on Atari 8-bit computers (''400'', [[Atari 800|800]], ''1200'', ''XL'', ''XE'') and the [[Atari ST]] line (including ''TT'' and ''Falcon'').
Most games consoles and home computers had two ports but the Atari 400 and [[Atari 800|800]] had four.

Many third-party joysticks for this pinout do have more than one button, but only for convenience — they are all wired to the same line.
Joysticks with [[Autofire|repeat-fire]] were supposed to use the +5V line for power but some are instead powered by the host's pull-up current on the button's pin.<ref name="jakadapterpullup">[http://kair.us/projects/jakadapter/index.html Jakadapter]. Section "Hardware", third paragraph. Dated 2018-10-20. Retrieved 2018-12-02</ref>

Atari released a ''Booster grip'' accessory for the 2600 with a passthrough for the joystick. It added a thumb button and a trigger; each on a POT line, shorting it to +5V when pressed and thus read as a [[#Paddles|paddle]].

The Atari 7800 console has joysticks with two trigger buttons but the console is backwards-compatible, containing also Atari 2600 hardware. Each new trigger button is wired between the 2600's trigger pin ''and'' a POT line with pull-down resistors to ground. This setup means that the buttons are two different buttons in 7800 mode but have the same function in Atari 2600 mode.
<ref name="atariage7800">AtariAge [http://atariage.com/7800/faq/index.html?SystemID=7800#cat2_9 7800 FAQ]. Retrieved 2017-03-30.</ref>