So :
--one button speedking : was mostly compatible with any mundane 1 button Atari controllers, so commercialised for Home computers : Atari ST, Amiga, C64, Speccy and Amstrad CPC/Plus.
--one button speedking : was mostly compatible with any mundane 1 button Atari controllers, so commercialised for Home computers : Atari ST, Amiga, C64, Speccy and Amstrad CPC/Plus. existed with autofire or not. --two buttons speed king :yet with autofire or not. a SEGA model may have existed too (Sega Master system). And an Atari ST/Amiga (perhaps Amstrad too then).
--Analog : was mostly for PC. It seemed to have actually 3 buttons from what I remember on advertisements, but the 3rd button may be a thing to calibrate instead..
--others : existed for nintendo (may have had extra buttons start and select) or SEGA Megadrive (3+1 1start buttons)
Concerning this model pictured :
Yes it seems to be a 2 button compatible with Amstrad PLUS/GX4000/CPC. This must have been quite rare, as most CPC used the 1 button model. This is just the same as Sega compatible ones the 2 button model with no autofire, yet slightly re-differently wiredcompaired to Sega compatible ones.
But it is in no way an ANALOG model.
Analog speed king had a different stick.
http://www.davduf.net/Konix-Speedking.html
there you can also see a 1 button model with Autofire (Amiga or Atari ST...or even others)
http://cgi.ebay.fr/Manette-de-jeu-SEGA-SPEED-KING-KONIX/170443043568
the sega model, with 2 buttons and autofire.
http://cgi.ebay.fr/Manette-KONIX-Speedking-ATARI-AMSTRAD-Teste-OK_W0QQitemZ290391592307QQcmdZViewItemQQptZFR_SK_JeuxVideo_Accessoires?hash=item439cb00d73
There the same but in slightly different wiring probably.
There the same but in slightly different wiring. http://cpcrulez.fr/hardware_joystick_konix_speedking.htm (2 pictures of different models)
http://img.over-blog.com/481x475/1/27/40/16/Evolution-joystick/Joystick-evolution-Speedking-analogue.jpg