Ideas for a 1040STF with a socket on the wrong side?

[32bitminus]

So I just picked up a 1040 STF and it looks like it will be more than just a retrobrite and cleaning.

I need to add the composite sync circuit, after that I can test the system out and see if it boots. previous owner did this:

IMG_20190221_130824.jpg

So I have a socket soldered on top of the CPU, any ideas for MODs I could do easily now that I have a socket on top?

[32bitminus]

I am starting to think it was for a variant of this:

https://www.atarimagazines.com/startv5n7/at_speed.html

AT Speed 286 chip

[rubber_jonnie]

I am starting to think it was for a variant of this:

https://www.atarimagazines.com/startv5n7/at_speed.html

AT Speed 286 chip

Or one of these https://www.ebay.co.uk/itm/Vortex-AT-ON ... :rk:1:pf:0

[32bitminus]

Ohh thanks, this is bringing back memories, I used to have a Spectre GCR and a Supercharger, I kinda remember looking at these boards. Was probably scared of all the soldering at the time.

What was that software one PC Ditto? did JIT I think...