MCT Serial board mystery - Can you crack the pinout code?

[Tothwolf]

On Sat, 15 Nov 2014, drlegendre . wrote:

> FYI - I put up a couple photos of the board at:
>
> http://nerp.net/~legendre/altair/mct_serial_01.jpg
>
> http://nerp.net/~legendre/altair/mct_serial_02.jpg

What happened with the charred area between the uarts and the edge 
connector (hopefully not conductive)? Did that pair of tantalum capacitors 
burn up? Nichicon PW series low-esr aluminum electrolytics make for an 
excellent radial tantalum replacement.