<s>
The	O
IBM	B-Device
5110	I-Device
Computing	O
System	O
is	O
the	O
successor	O
of	O
the	O
IBM	B-Device
5100	I-Device
Portable	O
Computer	O
.	O
</s>
<s>
The	O
IBM	B-Device
5110	I-Device
was	O
announced	O
in	O
January	O
1978	O
(	O
a	O
little	O
over	O
2	O
years	O
after	O
the	O
introduction	O
of	O
the	O
IBM	B-Device
5100	I-Device
)	O
.	O
</s>
<s>
Its	O
main	O
differences	O
were	O
support	O
for	O
more	O
I/O	O
devices	O
(	O
floppy	B-Device
disk	I-Device
drives	I-Device
,	O
IEEE-488	O
,	O
RS-232	O
)	O
and	O
a	O
character	B-General_Concept
set	I-General_Concept
(	O
EBCDIC	B-Language
)	O
which	O
was	O
compatible	O
with	O
other	O
IBM	O
machines	O
.	O
</s>
<s>
These	O
improvements	O
made	O
it	O
partially	O
incompatible	O
with	O
the	O
IBM	B-Device
5100	I-Device
.	O
</s>
<s>
Three	O
variations	O
of	O
the	O
IBM	B-Device
5110	I-Device
were	O
built	O
:	O
</s>
<s>
The	O
5110	O
featured	O
the	O
same	O
housing	O
as	O
the	O
5100	O
(	O
although	O
the	O
colors	O
were	O
different	O
)	O
,	O
which	O
contained	O
an	O
IBM	B-Device
PALM	I-Device
processor	I-Device
,	O
a	O
keyboard	B-Device
and	O
a	O
1,024	O
-character	O
display	B-Device
screen	I-Device
.	O
</s>
<s>
Offering	O
either	O
magnetic	O
tape	O
or	O
diskette	B-Device
storage	O
,	O
the	O
Model	O
1	O
could	O
store	O
as	O
much	O
as	O
204,000	O
bytes	O
of	O
information	O
per	O
tape	B-Device
cartridge	I-Device
or	O
1.2	O
MB	O
on	O
a	O
single	O
diskette	B-Device
;	O
the	O
Model	O
2	O
allowed	O
only	O
diskette	B-Device
storage	O
.	O
</s>
<s>
Up	O
to	O
two	O
IBM	O
5114	O
diskette	B-Device
units	O
,	O
each	O
housing	O
a	O
maximum	O
of	O
two	O
diskette	B-Device
drives	O
,	O
could	O
be	O
attached	O
to	O
the	O
5110	O
for	O
a	O
total	O
online	O
diskette	B-Device
capacity	O
of	O
4.8	O
MB	O
.	O
</s>
<s>
The	O
IBM	B-Device
5110	I-Device
Model	O
3	O
allowed	O
only	O
one	O
external	O
IBM	O
5114	O
diskette	B-Device
unit	O
.	O
</s>
<s>
IBM	O
did	O
not	O
offer	O
a	O
LAN	B-General_Concept
or	O
hard	B-Device
disk	I-Device
drive	I-Device
for	O
these	O
systems	O
.	O
</s>
<s>
However	O
,	O
in	O
1981	O
Hal	O
Prewitt	O
,	O
founder	O
of	O
Core	O
International	O
,	O
Inc	O
invented	O
and	O
marketing	O
the	O
world	O
's	O
first	O
and	O
only	O
hard	B-Device
disk	I-Device
subsystems	O
and	O
"	O
CoreNet	O
"	O
,	O
a	O
LAN	B-General_Concept
used	O
to	O
share	O
programs	O
and	O
data	O
for	O
the	O
IBM	B-Device
5110	I-Device
and	O
5120	O
systems	O
.	O
</s>
<s>
Citing	O
the	O
easy	O
use	O
of	O
his	O
new	O
system	O
,	O
Jeff	O
Grube	O
,	O
vice	O
president	O
of	O
Punxsutawney	O
Electric	O
Repair	O
(	O
who	O
received	O
the	O
first	O
IBM	B-Device
5110	I-Device
on	O
February	O
2	O
,	O
1978	O
)	O
,	O
said	O
:	O
"	O
If	O
you	O
can	O
type	O
and	O
use	O
a	O
hand-held	O
calculator	O
,	O
you	O
have	O
all	O
the	O
skills	O
necessary	O
to	O
operate	O
a	O
5110.	O
"	O
</s>
<s>
The	O
5110	O
was	O
available	O
with	O
either	O
APL	B-Language
or	O
BASIC	B-Language
—	O
or	O
both	O
—	O
programming	O
languages	O
.	O
</s>
<s>
In	O
1984	O
,	O
Core	O
International	O
,	O
Inc	O
introduced	O
PC51	O
,	O
software	O
that	O
allowed	O
5100	O
Series	O
computer	O
programs	O
written	O
in	O
BASIC	B-Language
to	O
run	O
unmodified	O
on	O
the	O
IBM	B-Device
PC	I-Device
and	O
compatibles	O
under	O
PC	O
DOS	O
and	O
share	O
programs	O
and	O
data	O
on	O
CoreNet	O
,	O
the	O
LAN	B-General_Concept
for	O
all	O
these	O
models	O
.	O
</s>
<s>
It	O
achieved	O
this	O
short	O
timescale	O
under	O
the	O
management	O
of	O
Bill	O
Sydnes	O
,	O
who	O
as	O
a	O
member	O
of	O
Bill	O
Lowe	O
's	O
taskforce	O
later	O
did	O
much	O
the	O
same	O
for	O
the	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
As	O
a	O
business	O
system	O
,	O
IBM	O
offered	O
a	O
number	O
of	O
basic	B-Language
accounting	O
software	O
for	O
a	O
small	O
business	O
.	O
</s>
<s>
The	O
IBM	B-Device
5110	I-Device
Model	O
3	O
(	O
also	O
known	O
as	O
the	O
IBM	B-Device
5120	I-Device
Computing	O
System	O
)	O
was	O
the	O
desktop	B-Device
version	O
of	O
the	O
5110	O
.	O
</s>
