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Th1s
S1~ct1on contams
generat information about the Model
91 OOA. lncluded 1s a d1scussion of calculator perfor-
mance
checks,
accessories supplied with the Model 9100A.
and
m format1on
concern
ing
servicing.
The Hewfett-Packard 9100A Calculator is a scientific desk-
top
ca
Ieu
lator.
Trigonometrie and loga rithmic functions
are
calculated
w1th a single keystroke. The Model
9100A
1s programmable; conditional branch instructions provide
complete programming capability. ln addition, two pro-
grams
can
be recorded on each magnetic card supplied
with the 91 OOA.
The Calculator has
two
memory systems. One JS a unique
Hewlett-Packard Read-Only-Memory. lt contains the sub-
routines
necessary to execute
the
keyboard instructions
and to calculate the
trigonometric
and logarithmic func-
t
.
I I
1ons.
The 91 OOA also contains a magnetic core memory which
adds
the
storage
and programming features. There are
19
access1ble registers in
the
magnetic core memory:
three
are
d1splayed, two are only for data storage and 14 can
be
used for program storage or tor additional data storage.
The 14 program reg1sters can accommodate up
to 196
program
steps.
Three reg1sters are displayed on
the
cathode ray
tube;
they are designated
x
KEYBOARD, y
ACCUMULATOR and
z
TEMPORARY. The format of
the
display can
be
selected
on the keyboard. With Floating Point notation,
the
contents
of the registers are displayed as a
ten -digit
number and
a
two-d1git exponent. indicating
the
power of
ten multiplier.
This mode of display allows simultaneaus presentation
of
very large (up to
1Q99)
and
very
small (down
to 10-s)
numbers. With Fixed
Point
notation,
the
contents
of the
registers are displayed in
decimal format, with the num·
ber of digits
to the right
of
the decimal
(0
to 9) set by the
decimal
thumbwheel.
Regardless
of
the display mode
selected,
the 9100A
operates in
Floating Point calculat-
ing all answers
to 12 digits,
of
which ten are displayed.
I
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