Texas Instruments TI-99/4A - Page 127

THE PLUS/
EQUALS KEY
PLUyEQUALS key
While we are on the subject of math, let's exam
ine the final key on the top row, the +/= key It
is
used for calculations. Pressing this key alone
creates the symbol =. Holding the SHIFT key
while pressing this key produces a +.
You'll use the + in addition problems, and there
is no limit to the number of times it can be used.
Type
126