Question, PC Transporter...again

[labelas@hotmail.com (Labelas Enoreth)]

Hey, I was looking at my PCT card again and noticed some things I'd ask
questions about, since I have no manual and such...besides, everyone's
been so helpful so far...
on the rear of the card, there is a 40-pin empty socket...what option or
upgrade utilized this? an optional z80, or...?
next to the keyboard and modulator connections, there is a 5-pin
connector, what is this for? There is also a 20-pin plug to attach a cable
of some kind to as well. Which of these is where the ColorSwitch attached?
(Not that I have one, though I would quite like one) and which is for the
CGA-out cable? I was under the impression the CGA out would be 2 pins. Or
am I supposed to attach the CGA out to the pins that are coming out to the
modulator?
Also, this appears to be revision E...as I am seeing that certain
revisions of cards _do_ matter, was this the newest and/or have any known
problems/benefits?