This new Avengers of mine plays normally, including the ball shooter, without a CR dongle attached. Is this typical of Kyoraku (OK) machines or should I be looking to see if this one's been modified? I'll eventually want to use it with a daverob dongle and card reader, so I'm wondering if this might cause a problem?

If it looks to have been modified, is there any sort of typical way to do it on the Kyoraku machines? A very quick glance at the back didn't immediately reveal any obvious opto-isolaters so I'll have to find those to see if they've been bridged.