Well I debated about whether this counted as a computer or not and I finally decided it did. It has 1.9 K RAM and a QWERTY keyboard.
Anyway, it is also known as the Radio Shack PC-1, Tandy PC-1 or a rebadged Sharp PC1211. It was released in 1980. I think I bought my on clearance in 1982 and used it for physics classes. I was given another one just recently. It belonged to Big Rivers Electric Cooperative and was found in a battery factory. The price on the box is $170!
Anyway, it functioned nicely as a calculator. You could type and edit the expressions algebraically. Also you could use variables. And the BASIC capability was nice too. I have the printer attachment somewhere around the house.
Unfortunately both have the display rot common to the series. The Big Rivers one actually still has working batteries.
Mine from College: