<s>
The	O
HP	O
38G	O
(	O
F1200A	O
,	O
F1892A	O
)	O
is	O
a	O
programmable	O
graphing	B-Application
calculator	I-Application
by	O
Hewlett-Packard	O
(	O
HP	O
)	O
.	O
</s>
<s>
The	O
calculator	O
is	O
derived	O
from	O
and	O
the	O
hardware	B-Application
is	O
based	O
on	O
the	O
more	O
powerful	O
science/engineering	O
oriented	O
HP	O
48	O
series	O
of	O
machines	O
.	O
</s>
<s>
The	O
two	O
models	O
were	O
differentiated	O
by	O
the	O
inclusion	O
of	O
a	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
(	O
CAS	O
)	O
in	O
the	O
HP40G	O
.	O
</s>
<s>
Beginning	O
with	O
the	O
39g+	O
,	O
all	O
of	O
these	O
successors	O
have	O
been	O
built	O
using	O
an	O
ARM	B-Architecture
architecture	I-Architecture
CPU	O
with	O
varying	O
degrees	O
of	O
emulation	O
to	O
support	O
software	O
written	O
for	O
previous	O
members	O
of	O
the	O
series	O
,	O
and	O
have	O
gradually	O
added	O
more	O
modern	O
methods	O
of	O
connectivity	O
such	O
as	O
USB	B-Protocol
to	O
either	O
replace	O
or	O
supplement	O
the	O
original	O
RS-232	O
and	O
IR	O
.	O
</s>
