4
GENER
AL
DESC
RIPTION
J
This section contains general informati
on
about the Model
9100A
.
In
cluded is a discussion of calculator perfor-
mance c
he
cks, accessories supplied with the Model
9100A,
and information concerning
se
rvicing.
The Hewle
tt
-
Pa
ckard 9100A Calculator is a scientific desk-
top calcula
tor
. Trigonometric and logarithmic functions
are
ca
llculated with a single keystroke. The Model 9100A
is programmable; conditional branch instructions provide
complete programming capability.
In
addition, two pro-
grams can
be
recorded
on
each magnetic card supplied
with the
91
00A.
The Calculator
has
two memory systems.
One
is a unique
Hewle
tt
-
Pa
ckard
Read
-Only-Memory. It contains the sub-
routines necessary
to
execute the keyboard instructions
and to calculate the trigonometric and logarithmic func-
tions. ..
The 9100A also contains a magnetic core memory which
adds the storage and programming features. There are
19
accessible registers in the magnetic core memory: three
are displayed, two are only for data storage and 14
can
be
used
for
program storage
or
for
additional data storage.
The
14
program registers can accommodate up to 196
program steps.
Three registers 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-
digit
exponent, indicating the power
of
ten multiplier.
This mode
of
display allows simultaneous presentation
of
very large (up
to
10
99) and very small (down to 10"98)
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.
'
•
