Oddities in a 2-port 5200

[unixdude]

Hey, all.  I'm modding a 5200 for UAV today, and I came across a couple of oddities.  Anybody know what these are?

 

On the GTIA, pin 11 is pulled and is not connected to anything.  On the bottom left of the board, there's a couple of wires, and one of the pins is pulled on a 74LS51.

 

As you can see from the pic, this 5200 works fine.

 

Thanks.

 

[+x=usr(1536)]

This looks to be the factory compatibility modification for the 2-port 5200.  Check the 5200 FAQ, Section 4.10, and see if the three items listed therein apply.  It appears as though at least two of them do in your case

[+-^CrossBow^-]

Like @x=usr(1536) stated, these are factory done from back in the day. Nothing to worry about.

[unixdude]

Thanks, I didn't figure it was something to worry about, just wondered what it was.

 

And, of course the S-video output looks amazing -- thanks @-^CrossBow^- for encouraging me to not stop at composite.

 

And, @x=usr(1536), thanks for the link to the FAQ!