HP HP-65 - Display

Clearing Entire Calculator
The entire calculator can be completely cleared by turning the
power switch off, then on. When the power comes on, however,
programs for the default functions corresponding to the window
legends above the top row keys ([ ] , , , REID)
will be automatically placed in program memory.
Clearing Program Memory
] clears the HP-65’s 100-step program memory but is
effective only when the W/PRGM-RUN switch is in W/PRGM
position. In RUN position, [ has the same effect as
CLX .
Display
The display is used to show results, operational errors, low bat-
tery condition, program in execution, and program steps. Addi-
tionally, in W/PRGM mode, the display allows you to “see” each
step of a program in memory (this use of the display will be de-
scribed in the Programming section).
Setting Display
The HP-65 displays up to 15 characters: mantissa sign, 10-digit
mantissa, decimal point, exponent sign, and 2-digit exponent. In
RUN mode, the display shows a rounded version of the number
in the X register. Two display modes (fixed and scientific nota-
tion) with a variety of rounding options may be selected from the
keyboard. (Rounding options affect the display only; the HP-65
always maintains full accuracy internally.)
Fixed Display. Fixed notation is specified by pressing BER [+]
followed by the appropriate number key to specify the number
of decimal places (0-9) to which the display is to be rounded.
Fixed notation allows all answers to be displayed with the same
precision. The display is left-justified and includes trailing zeros
within the setting selected. When the calculator is turned off,