Is this a legit 5200 mod? I just popped it open and this is what I saw.

[Hank Rearden]

I am reasonably sure this hasn't been opened in years due to the dirt and dust in the unit. There's some wiring that was done and a leg lifted on one of the chips. Does anyone recognize this or know why it might have been done?

 

[Hank Rearden]

I found some information online and this appears to be a factory mod. I guess going from 4 port to 2 port had some issues. I think I'm good.

[7800fan]

I also saw this and made a schematic revision to show how this mod was done: http://atariage.com/forums/topic/266420-schematic-variation-for-5200-2-ports/#entry3778860 It is a factory fix to deal with minor issue that was overlooked when they approved the board design for production. The took an unused gate, wired it from a line and added it to another gate, cut a trace. My guess a timing issue that needed this added line. Also 4 analog pins that originally went to controller port 3 and 4 had to be grounded, they left it floating and that caused issue with some games.

 

I don't know about that one lifted pin though.

[adam242]

The lifted GTIA pin is trigger input for joystick 3 (numbered 0-3). Odd they would leave trigger 2 connected, if this was part of a 2-port modification.