Editing Atari interface (section)

===PC bus mouse===
When Atari and Commodore started offering [[IBM Personal Computer|IBM]]-compatible PCs with built-in mouse support, they reused their mice and ports from the Atari ST and Amiga respectively as [[Bus mouse|bus mice]].
Atari's "STM1" mouse got relabelled as "PCM1" for use with Atari PCs.<ref name="ataripcnetpc3">AtariPC.net—[http://www.ataripc.net/pc3-8088/ PC3 8088]. Retrieved 2019-03-24</ref>.
The Atari PC's mouse ports support a third (middle) mouse button
<ref name="ataripcom">Atari PC Owner's manual [http://www.ataripc.net/files/documents/archives/ownersmanual/Atari%20PC%20Owners%20Manual%20-%20English.pdf Scan on ataripc.net]. Page 65. Dated 1987. Retrieved 2019-03-24</ref>, whereas the Atari ST does not.
Amiga-compatible mouse ports were standard (on the motherboard) on the Commodore PC10-III and PC20-III.<ref>Ancient Electronics blog—[https://ancientelectronics.wordpress.com/2015/06/17/commodore-colt-commodore-pc10-iii-pc20-iii/ Commodore Colt (Commodore PC10-III, PC20-III)</ref>

Amstrad PC-1512<ref name="amstradpc1512">[http://www.seasip.info/AmstradXT/1512tech/section1.html Amstrad PC1512 Technical Reference Manual]. Copy on John Elliott's homepage, retrieved 2019-03-29</ref>, PC-1640<ref name="amstradpc1640">[http://www.seasip.info/AmstradXT/1640tech/section1.html AMSTRAD PC1640 TECHNICAL MANUAL]. Copy on John Elliott's homepage, retrieved 2019-03-29</ref> and Sinclair PC-200<ref name="sinclairpc200">The Vintage Computer Club Malta—[https://web.computersmuseum.com/collection/sinclair/sinclair-pc-200/ SINCLAIR PC 200]. Retrieved 2019-03-26</ref> (made by Amstrad) got a dedicated 9-pin port for a [[bus mouse]]. They use almost the Atari ST pinout except that the horizontal axis is flipped. A curious detail is that the two mouse buttons' lines were fed to the keyboard and reported by it as key codes.

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