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76
Programming
As you can see, the program memory for the HP-25 is
separate
from the four
stack
registers, the
LAST
X
register
,
and
the
eight
storage
registers.
With
J
00
Jdisplayed
in PRGM mode
,
you
are ready
to
key in your program. Surface area
of a
sphere is calculated using
the
formula A
=
7Td
2
•
The
short
list of keys for the
area
of
a
sphere
program is
shown
below:
Keys
Comments
~2
I}
These keys
square
the diameter.
~
} These keys place
7T
in the X-register.
o
This key multiplies d
2
by
7T.
Keycodes
Press the first key of the program and the display will
change
to:
15
J
The two numbers on the right of the display designate the key
stored in that
step.
Each key on the keyboard has
a
two-digit
keycode
.
For
convenience,
the digit keys are
coded
00 through
09. All other keys are coded by their position
on
the keyboard.
The first
digit
denotes the row of the key
and
the second digit the
number
of the
key in that row.
So
15 tells you that the key
is
in
the first row on the calculator and that it is the fifth key
in
that
row, the
iii
key.
1st Row
5th Key
This handy matrix system
allows you
to easily determine
the
code for
each
instruction without using a reference table
.
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