<s>
HP	O
39/40	O
series	O
are	O
graphing	B-Application
calculators	I-Application
from	O
Hewlett-Packard	O
,	O
the	O
successors	O
of	O
HP	B-Device
38G	I-Device
.	O
</s>
<s>
The	O
HP	O
39g	B-Device
(	O
F1906A	O
)	O
was	O
released	O
in	O
2000	O
.	O
</s>
<s>
Communication	O
:	O
Proprietary	O
infrared	O
,	O
serial	O
RS-232	O
(	O
serial	B-Protocol
port	I-Protocol
)	O
.	O
</s>
<s>
The	O
hardware	O
is	O
identical	O
to	O
the	O
HP	O
49G/39G	O
series	O
(	O
complete	O
with	O
rubber	O
keyboard	O
)	O
.	O
</s>
<s>
In	O
contrast	O
to	O
the	O
39g	B-Device
,	O
it	O
integrates	O
the	O
same	O
computer	B-General_Concept
algebra	I-General_Concept
system	I-General_Concept
(	O
CAS	O
)	O
also	O
found	O
in	O
the	O
HP	O
49G	O
,	O
HP	B-Application
CAS	I-Application
.	O
</s>
<s>
Communication	O
:	O
No	O
infrared	O
communication	O
,	O
serial	O
RS-232	O
(	O
serial	B-Protocol
port	I-Protocol
)	O
.	O
</s>
<s>
Software	O
:	O
Includes	O
an	O
equation	O
writer	O
and	O
advanced	B-Application
CAS	I-Application
.	O
</s>
<s>
The	O
HP	O
39g+	O
(	O
F2224A	O
)	O
was	O
released	O
in	O
September	O
2003	O
.	O
</s>
<s>
Communication	O
:	O
USB	B-Protocol
Mini-B	O
port	O
(	O
using	O
the	O
Kermit	B-Protocol
or	O
XModem	B-Protocol
protocols	O
)	O
,	O
IrDA	O
(	O
infrared	O
)	O
.	O
</s>
<s>
Note	O
:	O
Although	O
an	O
ARM	O
processor	O
is	O
used	O
in	O
this	O
model	O
,	O
the	O
operating	O
system	O
is	O
substantially	O
the	O
same	O
as	O
that	O
of	O
the	O
39G	B-Device
,	O
with	O
the	O
Saturn	B-Application
chip	O
being	O
emulated	O
on	O
the	O
ARM	O
at	O
a	O
higher	O
speed	O
than	O
was	O
possible	O
for	O
the	O
39G	B-Device
.	O
</s>
<s>
Communication	O
:	O
USB	B-Protocol
Mini-B	O
port	O
(	O
using	O
the	O
Kermit	B-Protocol
or	O
XModem	B-Protocol
protocols	O
)	O
,	O
IrDA	O
(	O
infrared	O
)	O
,	O
4-pin	O
asynchronous	O
3.3V	O
TTL	O
serial	B-Protocol
port	I-Protocol
(	O
RS-232	O
via	O
active	O
converter	O
)	O
.	O
</s>
<s>
Note	O
:	O
Although	O
an	O
ARM	O
processor	O
is	O
used	O
in	O
this	O
model	O
the	O
operating	O
system	O
is	O
substantially	O
the	O
same	O
as	O
that	O
of	O
the	O
39G	B-Device
,	O
with	O
the	O
Saturn	B-Application
chip	O
being	O
emulated	O
on	O
the	O
ARM	O
at	O
a	O
higher	O
speed	O
than	O
was	O
possible	O
for	O
the	O
39G	B-Device
.	O
</s>
<s>
Software	O
:	O
Includes	O
an	O
equation	O
writer	O
and	O
advanced	B-Application
CAS	I-Application
.	O
</s>
<s>
The	O
high-resolution	O
monochrome	O
gray-scale	O
LCD	O
provides	O
256×128	O
pixels	B-Algorithm
.	O
</s>
<s>
Connectivity	O
is	O
provided	O
through	O
a	O
USB-OTG	O
Micro-AB	O
connector	O
.	O
</s>
<s>
The	O
Pascal-like	O
programming	O
language	O
supported	O
by	O
the	O
calculator	O
is	O
a	O
predecessor	O
of	O
the	O
HP	B-Device
Prime	I-Device
's	O
HP	B-Device
PPL	I-Device
.	O
</s>
<s>
Development	O
of	O
a	O
"	O
HP	B-Device
39gII+	I-Device
"	O
,	O
an	O
improved	O
variant	O
of	O
the	O
calculator	O
powerful	O
enough	O
to	O
include	O
a	O
CAS	O
,	O
was	O
almost	O
finished	O
when	O
the	O
underlying	O
processor	O
was	O
abandoned	O
by	O
Freescale	O
,	O
causing	O
the	O
project	O
to	O
be	O
abandoned	O
as	O
well	O
.	O
</s>
<s>
color	O
touchscreen	O
,	O
even	O
more	O
powerful	O
processor	O
)	O
,	O
which	O
eventually	O
led	O
to	O
the	O
release	O
of	O
the	O
HP	B-Device
Prime	I-Device
in	O
2013	O
.	O
</s>
