I picked up an old controller that reminded me of the classic SNES or Sega Genesis six-button controllers, but I haven't been able to ID exactly what type of controller this is. I'd appreciate your help to figure out exactly what system(s) this controller would work with. Thanks!
It's a "Blockbuster brand" SNES controller. They're apparently very rare. Unfortunately there doesn't seem to be much information online besides that.
This is a third party controller that - if I remember correctly - was designed for the SNES but also worked for the Sega Genesis (megadrive).
The switches in the middle were autofire cheats. If the switch was on, then the controller would automatically and repeatedly trigger the corresponding button, so you didn't have to hammer your controller.
Asciipad is a brand that does similar controllers: