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8
R GRAMIMI
The Hewlett Packard Model
9100A has a maximum capa-
c tty of
196 program steps. The 0, 1, 2, 3,
4,
5, 6,
7,
8,
9,
a,
b
c,
and
d
regtsters can be used for etther program
or data storage. The X, Y and Z
regtsters
are
the
display
regtsters and
the
e
and
F
regtsters are only data storage
regtster~.
these ftve regtsters cannot be used
for
program
storage.
Program stor age conststs of a
14
by
14
array (see
Figure
1 ). The regtsters are destgnated 0, 1, 2, 3,
4,
5,
6, 7, 8,
9,
a, b, c,
and
d
as are
the
characters in each
register.
Memot"Y address
c2
ind1cates
the c regtster
and character
2
tn
the
c
regtster.
A program ts stored so
that
the regtster with
the
starting
addres.s of the program ts ftlled w1th the program steps
be-
fore the next sequenttal
regtster
ts entered
to
store pro-
gram steps. Wtth
the
first program step in location
00,
program storage wtll be
used
tn
the
followtng manner:
00,
01, . . . 09.
O a.
Ob, Oe, Od.
10
. . . .
19, la, 1b, lc, ld,
20 ...
up to
dc,
d
d.
the address at
which the program
coql;lter resets to
00.
lt ts not necessary
to
learn a program language
for
the
Calculator.
Keyboard
operations are
the
program instruc-
tlons. Each program step is one
keyboard
instruction.
Programs
that require more
storage
than
the
e
and
f
regis-
ters necess1tate use of a register
that
could
be used for
program storage.
A
complete reg1ster is required
for
stonng a ten-dtgtt number and
the
two-digi
t
exponent;
therefore. the maxtmum program stze of
196
steps is
re-
duced by
14
steps for each program
register used for data
~o~ge.
CHARACTER
o
1 2 3 4 5 6 7 8 9
a
b
c d
0
1
2
2c
3
4
5
6
C:t:
7
Program or Data Storage
La.l
8
·-
( f)
9
--
<-'
La.l
a
':t:
b
c
c2
d
e
f
Data Storage
...
X
y
Display
z
Figure 1
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