<s>
The	O
HP-75C	B-Device
and	O
HP-75D	B-Device
were	O
hand-held	O
computers	O
programmable	O
in	O
BASIC	O
,	O
made	O
by	O
Hewlett-Packard	O
from	O
1982	O
to	O
1986	O
.	O
</s>
<s>
The	O
HP-75	B-Device
had	O
a	O
single-line	O
liquid	B-Device
crystal	I-Device
display	I-Device
,	O
48	O
KiB	O
system	O
ROM	B-Device
and	O
16	O
KiB	O
RAM	B-Architecture
,	O
a	O
comparatively	O
large	O
keyboard	O
(	O
albeit	O
without	O
a	O
separate	O
numeric	O
pad	O
)	O
,	O
a	O
manually	O
operated	O
magnetic	O
card	O
reader	O
(	O
2×650	O
bytes	B-Application
per	O
card	O
)	O
,	O
4	O
ports	O
for	O
memory	O
expansion	O
(	O
1	O
for	O
RAM	B-Architecture
and	O
3	O
for	O
ROM	B-Device
modules	O
)	O
,	O
and	O
an	O
HP-IL	B-Architecture
interface	O
that	O
could	O
be	O
used	O
to	O
connect	O
printers	O
,	O
storage	O
and	O
electronic	O
test	O
equipment	O
.	O
</s>
<s>
The	O
BASIC	O
interpreter	O
also	O
acted	O
as	O
a	O
primitive	O
operating	O
system	O
,	O
providing	O
file	O
handling	O
capabilities	O
for	O
program	O
storage	O
using	O
RAM	B-Architecture
,	O
cards	O
,	O
or	O
cassettes/diskettes	O
(	O
via	O
HP-IL	B-Architecture
)	O
.	O
</s>
<s>
Other	O
features	O
included	O
a	O
text	O
editor	O
as	O
well	O
as	O
an	O
appointment	O
reminder	O
with	O
alarms	O
,	O
similar	O
to	O
functions	O
of	O
modern	O
PDAs	B-Application
.	O
</s>
<s>
The	O
HP-75D	B-Device
(	O
1984	O
–	O
1986	O
)	O
added	O
a	O
port	O
for	O
a	O
bar	O
code	O
wand	O
,	O
often	O
used	O
for	O
inventory	O
control	O
tasks	O
.	O
</s>
<s>
The	O
HP-75	B-Device
was	O
comparatively	O
expensive	O
with	O
an	O
MSRP	B-Protocol
of	O
$995	O
( $	O
2,014	O
in	O
2005	O
)	O
for	O
the	O
75C	B-Device
or	O
$1095	O
( $	O
2,058	O
in	O
2005	O
)	O
for	O
the	O
75D	O
,	O
making	O
it	O
less	O
popular	O
than	O
the	O
cheaper	O
successor	O
model	O
,	O
the	O
HP-71B	B-Device
.	O
</s>
<s>
The	O
HP-75C	B-Device
has	O
a	O
KANGAROO	O
printed	O
on	O
its	O
PCB	O
,	O
as	O
its	O
codename	O
(	O
see	O
link	O
for	O
picture	O
)	O
.	O
</s>
<s>
HP-75D	B-Device
codename	O
's	O
is	O
MERLIN	O
.	O
</s>
<s>
BYTE	B-Application
praised	O
the	O
flexibility	O
of	O
the	O
appointment	O
scheduler	O
,	O
which	O
the	O
review	O
noted	O
could	O
comprise	O
part	O
of	O
a	O
real-time	O
control	O
system	O
because	O
of	O
its	O
ability	O
to	O
execute	O
BASIC	O
programs	O
.	O
</s>
<s>
It	O
concluded	O
that	O
the	O
computer	O
"	O
is	O
a	O
well-integrated	O
and	O
powerful	O
machine	O
...	O
if	O
you	O
are	O
interested	O
in	O
...	O
a	O
very	O
portable	O
computer	O
with	O
powerful	O
real-time	O
scheduling	O
capabilities	O
,	O
you	O
should	O
look	O
closely	O
at	O
the	O
HP-75	B-Device
"	O
.	O
</s>
