HP HP-67

42 Display Control
Display Control Keys
There are four keys, (F1x], [5C1], [EnG), and 53 that allow you to
control the manner in which numbers appear in the display in the
HP-67. 53 followed by a number key changes the number of dis-
played digits without changing the format. displays numbers in
fixed decimal point format, while permits you to see numbers in
scientific notation format. (ENG) displays numbers in engineering nota-
tion, with exponents of 10 shown in multiples of three (e.g., 103, 1078,
10%).
No matter which format or how many displayed digits you choose,
these display control keys alter only the manner in which a number is
displayed in the HP-67. The actual number itself is not altered by
any of the display control keys. No matter what type of display you
select, the HP-67 always calculates internally with numbers con-
sisting of full 10-digit mantissas multiplied by 10 raised to a two-digit
exponent.
Display Number Changes
The 53 (display) key followed by a number key specifies the num-
ber of digits that your HP-67 will display. For example, when you
turn the HP-67 ON, it ‘‘wakes up’’ with two digits displayed after
the decimal point. Using the 53 key and the appropriate number
key (0-9), you can display up to nine digits after the decimal point.
For example:
Press Display
(Turn the calculator
OFF, then ON.) Calculator ‘‘wakes up”’
with two digits shown
after the decimal point.
C=3 4 0.0000 Four digits shown after
decimal point.
C=3 9 0.000000000 Nine digits shown after
decimal point.
Two digits shown after
decimal point.
53 2
In the next few pages, you will see how the 5 and number keys are
used in conjunction with (FX], (5C1J, and [ENG) to display numbers in
any of a wide variety of formats.