Editing Atari interface (section)

== Incompatible ==

===Different pinout===
DE-9 connectors with different pinout, but are signal-compatible with a passive [[adaptor]] (may or may not require diodes).

====Spectrum +2====
Sinclair Spectrum +2 and later ([[Amstrad]] era) have two joystick ports. They are accessed by programs in the same manner as the [[#ZX_Spectrum|ZX Interface 2]] but the pinout is no longer Atari-compatible but specific to this line of computers.

Some joysticks (especially sold in the UK) have a split cable with two plugs: one ''black'' that is Atari-compatible, and one ''gray'' for Sinclair.

====TI-99====
The [[Texas Instruments TI-99/4A]] has a different pinout on its DE-9 port.
It supports supports two digital joysticks by strobing different ground lines (like [[#Amstrad CPC|Amstrad CPC]]). An adaptor should have diodes to avoid interference.<ref name="compute39">
Compute! Issue 39 - August 1983. Gary Cook: [https://www.atarimagazines.com/compute/issue39/HOW_TO_BUILD_YOUR_OWN_TI-99_4A_JOYSTICK_ADAPTER.php How To Build Your Own TI-99/4A Joystick Adapter]. Retrieved from [https://www.atarimagazines.com www.AtariMagazines.com] on 2018-04-24</ref>

====Vectrex====
A Vectrex controller has an [[Joystick#Analogue|analogue joystick]] and four buttons. 
Each of the analogue stick's potentiometers has its ends connected to -5V and +5V and uses different resistor values than Atari, plus a slightly different pinout.
<ref>Computer Nerd Kev—[http://www.computernerdkev.heliohost.org/vecadapt/Vectrex_service_manual.pdf Vectrex Service Manual] (archived). Retrieved 2018-06-12</ref>
Nonetheless, adaptors both to the Atari standard<ref>Computer Nerd Kev—
[http://www.computernerdkev.heliohost.org/vec2600/vec2600.htm Vectrex Controller to Atari 2600 Adapter]. Kevin Koster 2015. Retrieved 2018-06-12</ref> and from digital Atari and Sega controllers have been made.
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====Fairchild Channel F System II====
The controller had a joystick that could not only be pushed in a plane but also pushed (like a button), pulled and twisted left and right. 

====Magnavox Odyssey²====
Later models had detachable DE-9 controllers. 
-->
===Different signalling===
Incompatible, that would require an active [[converter]] to connect:
* [[Serial interface|Serial mice]] for the IBM PC, with RS-232 signalling.
* Some ''Intellivision'' consoles have a DE-9 plugs for each of its controllers. The joystick has 16 directions, there are three buttons and a keypad — each producing a [[scancode]] shorted to ground (pin 5). Buttons and directions don't interfere though. An adaptor from an Atari joystick would require some logic and perhaps external power.<ref>Jay's Video Game Page ([http://arcarc.xmission.com/ ARCade ARChive])—[http://arcarc.xmission.com/Web%20Archives/Deathskull%20%28May-2006%29/games/tech/intvcont.html Intellivision Controller Pinouts]. Dated 1998-06-28. Retrieved 2018-06-11</ref>. The ''Intellivision Flashback'' console also has DE-9 connectors but the pinout is different.{{citation needed}}
* Gamepads for the ''3DO'' console. They used serial communication for up to eight controllers daisy-chained from the same host port. Each also had a headphone jack with stereo sound.<ref>Archive.org—[http://web.archive.org/web/20031210153930/http://lillith.sk.tsukuba.ac.jp/~kashima/games/3do_tr.pdf 3DO Transmitter for SST2X] Circuit schema by H.Kashima. Snapshot from 2003-12-10.</ref><ref>Youtube—[https://youtu.be/zYEePs_Gv0M Classic Game Room - PANASONIC 3DO Controller Review]. Published 2011-06-27. Watched 2018-06-07</ref>
* Several clones of the Nintendo Famicom — "Famiclones" used DE-9 ports with Nintendo's serial protocol.

===Different gender===
Other uses of 9-pin d-subminiature but different signals and different gender from the Atari standard:
* Analogue joysticks and paddles for the [[Apple IIGS]].
* [[Silicon Graphics|SGI]] mouse 021-0004-002 used a serial protocol.<ref>Image in ad on sekeimon.com—[http://www.sekaimon.com/gb/23160/Mice%2C+Trackballs+%26+Touchpads/173343458279/ 021-0004-002 - SGI MOUSE 9-PIN D-SUB]. Retrieved 2018-06-12</ref><ref>Hardware Book—[http://www.hardwarebook.info/SGI_Mouse_(Model_021-0004-002)_Connector SGI Mouse (Model 021-0004-002) Connector]</ref>