<s>
The	O
HP-22S	B-Device
is	O
an	O
electronic	O
calculator	O
from	O
the	O
Hewlett-Packard	O
company	O
which	O
is	O
algebraic	O
and	O
scientific	O
.	O
</s>
<s>
This	O
calculator	O
is	O
comparable	O
to	O
the	O
HP-32S	B-Device
.	O
</s>
<s>
It	O
had	O
the	O
same	O
constraints	O
as	O
the	O
32S	O
,	O
lacking	O
enough	O
RAM	B-Architecture
for	O
serious	O
use	O
.	O
</s>
<s>
Marketed	O
as	O
a	O
student	O
calculator	O
,	O
the	O
22S	O
uses	O
infix	O
notation	O
rather	O
than	O
the	O
reverse	O
polish	O
notation	O
used	O
on	O
some	O
higher-end	O
HP	B-Device
calculators	I-Device
of	O
the	O
same	O
era	O
.	O
</s>
<s>
The	O
HP-22S	B-Device
includes	O
many	O
of	O
the	O
typical	O
features	O
found	O
in	O
most	O
scientific	O
calculators	O
:	O
</s>
<s>
Introduced	O
simultaneously	O
with	O
the	O
HP-32S	B-Device
,	O
it	O
is	O
based	O
on	O
the	O
same	O
hardware	O
,	O
with	O
a	O
single	O
line	O
character-based	O
dot	B-General_Concept
matrix	I-General_Concept
display	I-General_Concept
that	O
can	O
display	O
both	O
numerical	O
and	O
alphabetical	O
characters	O
.	O
</s>
<s>
The	O
CPU	O
is	O
an	O
HP	B-Application
Saturn	I-Application
Sacajawea	O
chip	O
clocked	O
at	O
640kHz	O
,	O
making	O
it	O
slower	O
than	O
its	O
higher-spec	O
cousin	O
,	O
the	O
HP-27S	B-Device
.	O
</s>
