Apple IIgs Overlay Card info needed

[dlw@trailingedge.com (David Williams)]

I just received an Apple IIgs with some cool cards and I'm looking 
to see if anyone has doc or software for these.  The machine is a:

Apple IIgs Rom 3 (But with a Woz signed case)
Apple IIgs Memory Expansion (1 meg)
Transwarp GS
Apple II Video Overlay Card (This was the main card I wanted!!)
Applied Engineering RamKeeper
Battery which seems to go to a small card attached between the 
PSU and slot 1. I think this keeps power to the Ram.
2 3.5" drives
2 5.25" drives
Keyboard & mouse
ImageWriter II Printer

But no doc or software for any of it.  I'm interested in anything 
people can tell/send me on the Video Overlay Card mainly but also 
the Transwarp GS and the RamKeeper.  Doc, software and drivers.

Thanks in advance.

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David Williams - Computer Packrat
http://www.trailingedge.com