HP HP-67 User Manual

Simple Programming 129
Keycodes
Each key on the calculator is identified by a two-digit keycode. When
the W/PRGM-RUN switch is set to W/PRGM, the keycodes for the
keystrokes loaded into the current step of program memory appear on
the right side of the display. For example, the first keycode, 31,
identifies the 3" row of the keyboard, 15t key in that row. By counting
down three rows and looking at the first key on the calculator
keyboard, you can see that it is the €8 key.
LS
LT
39 row-
[ENTER®
The second keycode, 25, then refers to the 2% row, 5" key in that row;
and since the previous keycode was for the {8 prefix key, the function
selected by the keycode for the 2" row, 5™ key in that row is . The
last keycode is 11; that is, the 1% row, 1%t key in that row, the f§ key.
So the complete operation loaded into step 001 is £ 3.
Using this handy matrix system, you can easily identify any key by its
keycode in the display. Remember, always count from the top down
and from left to right. Each key, no matter how large, counts as one.
For convenience, digit keys are identified by keycodes 00 through 09,
although prefixed functions associated with digit keys are identified
by
the
matrix
address.
A
step
of
program
memory
cannot
contain
more
than
a
decimal
point
or
a
single
digit
of
a
number.
For
example,
if
you
press again, you can see that the number 5 is loaded into step 002
of program memory.

HP HP-67 Specifications

General

Brand	HP
Model	HP-67
Category	Calculator
Language	English