The CoCo 3 was
Tandy badged and never had TRS-80 nomenclature.
I believe the honor of last TRS-80 labeled computer falls on Tandy Radio
Shack's first PC clone attempt, the TRS-80 Model 2000 released in 1983,
shortly after the Z80 based Model 4 and MC68000 based 16B in the same year.
Might also be the Pocket Computer PC-3 (26-3590). This was also 1983. The
revamped 26-3589 with increased memory came out in 1984, and was simply badged
Tandy, so that appears to be the year the shift occurred. These were both
rebadged Sharp PC-125x series pocket computers, see
http://www.floodgap.com/retrobits/tpm/138.html
for pictures and history.
And now that I think about it, add the 1983 PC-4 (26-3650/26-3650A) to that
list, which was also upgraded and re-released sans TRS-80 in 1985 (26-3650B).
http://www.floodgap.com/retrobits/tpm/4567.html
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