<s>
The	O
Casio	B-Device
PB-1000	I-Device
is	O
a	O
handheld	O
computer	O
released	O
by	O
Casio	O
in	O
1987	O
.	O
</s>
<s>
It	O
featured	O
a	O
touchscreen	B-Device
display	O
which	O
consisted	O
of	O
16	O
keys	O
built	O
into	O
the	O
screen	O
,	O
arranged	O
in	O
fixed	O
positions	O
on	O
a	O
four	O
by	O
four	O
matrix	O
.	O
</s>
<s>
The	O
computer	O
itself	O
included	O
8Kb	O
of	O
RAM	B-Architecture
and	O
it	O
was	O
possible	O
to	O
install	O
a	O
32Kb	O
memory	O
expansion	O
card	O
.	O
</s>
<s>
The	O
PB-1000	O
was	O
programmable	O
in	O
both	O
a	O
custom	O
version	O
of	O
the	O
BASIC	O
language	O
and	O
an	O
assembly	B-Language
language	I-Language
.	O
</s>
<s>
A	O
ROM	B-Device
card	O
could	O
be	O
added	O
for	O
CASL	O
assembly	O
for	O
the	O
educational	O
COMET	O
simulator	O
.	O
</s>
