determing date on TI 99/4 computers.

[Ed via cctalk]

There is a white  or beige one
 
then there is the black and chrome  one?
 
which  first?  and  dates please?
 
This is unfamiliar territory  for me.
but need to pay homage to these
in a museum display here.
 
looking  for  good  hi res scans of
adv. material etc. for  display??
 
thanks  ed# _www.smecc.org_ (http://www.smecc.org)