Just my recollection but,
I've never heard of the Coco3 being called a TRS-80. Tandy Color Computer
3
The original CoCo was the Tandy/Radio Shack TRS-80 Color Computer
"Radio Shack" was dropped from the name for the CoCos 2 and 3. This
information comes from original Tandy press releases.
--Mike
I think some or all of the Coco2s were called TRS-80s.
All of the Coco 1s (including some white ones) were marketed as TRS-80.
At that time I didn't really hear "Tandy" used much. Perhaps it was
used for the TDP-100.
All I recall for the coco 1 was TRS-80 Color Computer or Radio Shack
TRS-80 Color Computer.
I guess it would be good enough to see what it says on the outside of
the box or on the bottom of the unit.
-- John.