HP HP-28S - Page 286

Q: The calculator is slower than usual, and the 0 annunciator is blink-
ing. What is happening?
A: The calculator is in Trace printing mode. Press .1 PRINT 1 TRAC to
turn off Trace printing mode.
Q: The printer prints several lines quickly, then slows down. Why?
A: The calculator quickly transmits a certain amount of data to the
printer, then slows its transmission rate to make sure the printer can
keep up.
Q: How can I speed up printing?
A: If your printer is plugged into an adaptor, the calculator can safely
send data at a faster rate. To select faster printing, type 52 SF
1 ENTER I. This sets flag 52, which controls the printing speed. When
the printer isn't plugged into an adaptor, type 52 CF 1 ENTER 1 to clear
flag 52
and return to normal printing speed.
Q: The printer drops characters or prints • characters. What is wrong?
A: The distance or angle between the printer and the calculator may
be too large, or there may be an obstruction blocking the transmis-
sion. See
the printer manual for details about positioning the printer
and calculator.
Q: What is the difference between STO and STORE?
A: The STO command assigns a specified value to a variable. The
STORE menu contains commands that perform storage arithmetic, us-
ing
the value of a variable as an argument and assigning the resulting
value to
the variable.
Q: I expected a symbolic result, but I got a numerical result. Why?
A: There are values assigned to one or more variables. Purge the con-
tents
of the variables (see HPurging a Variable
H
on page 52) and then
try again.
Q: When I press DRAW , the display clears, the «e)) annunciator blinks
and then stops, but I don't see any points plotted on the display. Why not?
A: The calculated values are outside the current plot range. See
UChanging
the Scale of the Plot" on page 91.
A: Assistance, Batteries, and Service 285