I just got a refurbished Colecovision. It seems to be working fine, better than any I had before. However, it only seems to work with Coleco joysticks and 2600 joysticks. I read that 7800 joysticks and europads should work, but they didn't. The Genesis pad did, but when I played Frenzy, the screen kept blacking out, which didn't happen when I used a 2600 stickl. The reason I'm asking is because I just got a Roller Controller, and the thing worked, for about 5 minutes, now it just goes up and down Likewise, when I try the 7800 joystick, the characters won't go down, just up, left and right. Do you think this is a port issue?