Peter a dead coms port...RS232 is only a MAX3221 IC...a $5 part. That's really decent offer by you.
If you want I can replace this RS232 IC for free (I have 2 spare ICs ATM, I'm an ex Avionics tech and have repaired a few gemini1's) if your giving away your Gemini1 & I'll fix it, test it and forward it to Adelain.
A kinda of.....you do a good thing and I'll help as well!
That's of course if you want this and Adelain is ok with all this.