Garmin 12Map / 76CS Compatibilities?

I have a G 12Map and am considering upgrading to the 76CS, but I have
a number of accessories that I am concerned whether they will
transfer. I have read the excellent writeups of the C and S at
http://www.gpsinformation.net/ , however I still have the following
questions:

1) Under "Software Compatibility", I see that Street Atlas is not
included in the list. I currently use SA2003 with the 12Map, for both
real-time tracking on a laptop, and waypoint/track down-/upload
to/from my PC.

2) I have several different cables for connecting the 12Map to the
laptop, PC, and automobile, for data transfer and power.

3) I use MapSource WorldMap, v5.4 on the PC and 12Map, for both data
and map transfer.

Can anyone advise me whether I might expect these existing items to
work similarly with the G 76CS?

Thank you kindly for your thoughts,
David


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