== Is this true? ==
Some modification occured in the Amstrad "Atari" standard, especially for the PLUS range Not problematic most time on a CPC old as Amstrad aimed the console market (GX4000) and used a politic of "Exclusive Hardware" like all console manufacturers of the timeALL oone button joysticks will fit.
Not that it was changed compaired to Old CPC generation (yet few CPC games actually supported But may put some difficulties with the 2 button feature, despite availablePLUS range.
Of Amstrad aimed the console market (GX4000) and used some kind of politic of "Exclusive Hardware" (like all console manufacturers of the time). Not that it was changed compaired to Old CPC generation (yet few CPC games actually supported the 2 button feature, despite available). And of course the Atari standard was originally a 1 button solution (Atari 8 bit 2600 consoles) but cxould easily be improuved to more buttons.
Sega Megadrives managed easily 6-8 button (Street Fighter 2 standard).
The most notable differences with other consoles using the Atari specs is with Sega systems (Master System and Megadrive) as the Atari standard became Sega standard (most sold console using this standard)
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Yet simple re-cabling can be achieved thanks to get a proper adapter made simply :
* a pair of "Atari / 9 pin serial" connectors (one male and one female)
This allows to keep the original configuration of Sega compatible Pads/joysticks and benefit from the higher quality level from them.
A clever move too may be to put such converter as a box with wires easily removable/changeable (not soldered, but inserted thank to proper solutions).(A clever move from Amstrad may have been to use SEGA standards).
This would allows to configure more easily different configurations depending on the Game controllers you may find.