<s>
The	O
System/23	B-Device
Datamaster	O
(	O
Model	O
5322	O
desktop	O
model	O
and	O
Model	O
5324	O
floor	O
model	O
)	O
was	O
announced	O
by	O
IBM	O
in	O
July	O
1981	O
.	O
</s>
<s>
The	O
Datamaster	O
was	O
the	O
least	O
expensive	O
IBM	O
computer	O
until	O
the	O
far	O
less	O
expensive	O
and	O
far	O
more	O
popular	O
IBM	B-Device
PC	I-Device
was	O
announced	O
in	O
the	O
following	O
month	O
.	O
</s>
<s>
The	O
Datamaster	O
is	O
an	O
all-in-one	B-Device
computer	I-Device
with	O
text-mode	O
CRT	B-Device
display	I-Device
,	O
keyboard	O
,	O
processor	O
,	O
memory	O
,	O
and	O
two	O
8-inch	B-Device
floppy	I-Device
disk	O
drives	O
in	O
one	O
cabinet	O
.	O
</s>
<s>
The	O
processor	O
is	O
an	O
8-bit	O
Intel	B-General_Concept
8085	I-General_Concept
running	O
at	O
4.77	O
MHz	O
,	O
with	O
bank	B-General_Concept
switching	I-General_Concept
to	O
manage	O
256KB	O
of	O
memory	O
.	O
</s>
<s>
It	O
could	O
display	O
80	O
x	O
24	O
character	O
text	O
(	O
each	O
character	O
with	O
10x14	O
pixels	O
)	O
with	O
256	O
possible	O
characters	O
,	O
similar	O
to	O
the	O
IBM	B-Device
PC	I-Device
's	O
Code	O
page	O
437	O
,	O
on	O
a	O
built-in	O
12	O
"	O
green	O
phosphorus	O
CRT	B-Device
.	O
</s>
<s>
IBM	O
decided	O
to	O
merge	O
the	O
Datamaster	O
's	O
BASIC	O
implementation	O
with	O
System/34	B-Language
BASIC	I-Language
,	O
which	O
reportedly	O
delayed	O
the	O
Datamaster	O
by	O
almost	O
a	O
year	O
.	O
</s>
<s>
The	O
familiarity	O
the	O
design	O
group	O
gained	O
on	O
the	O
Datamaster	O
project	O
encouraged	O
selection	O
of	O
an	O
Intel	O
CPU	O
for	O
the	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
The	O
delay	O
caused	O
by	O
the	O
decision	O
to	O
reuse	O
System/34	B-Language
BASIC	I-Language
in	O
the	O
Datamaster	O
was	O
one	O
of	O
the	O
factors	O
in	O
IBM	O
's	O
selection	O
of	O
Microsoft	B-Language
BASIC	I-Language
for	O
the	O
PC	O
(	O
the	O
other	O
being	O
the	O
ubiquity	O
of	O
Microsoft	B-Language
BASIC	I-Language
on	O
other	O
home	O
computers	O
at	O
the	O
time	O
)	O
.	O
</s>
<s>
A	O
number	O
of	O
hardware	O
components	O
from	O
the	O
Datamaster	O
were	O
reused	O
in	O
the	O
later	O
IBM	B-Device
PC	I-Device
.	O
</s>
<s>
The	O
PC	O
's	O
expansion	O
bus	O
,	O
later	O
known	O
as	O
the	O
ISA	B-Architecture
bus	I-Architecture
,	O
was	O
based	O
on	O
the	O
Datamaster	O
's	O
I/O	O
bus	O
.	O
</s>
<s>
The	O
Datamaster	O
's	O
Model	B-Device
F	I-Device
keyboard	I-Device
with	O
its	O
5251-style	O
key	O
arrangement	O
was	O
also	O
reused	O
in	O
the	O
PC	O
,	O
albeit	O
with	O
a	O
serial	O
interface	O
(	O
instead	O
of	O
the	O
parallel	O
one	O
used	O
on	O
the	O
Datamaster	O
)	O
and	O
a	O
new	O
external	O
housing	O
.	O
</s>
<s>
From	O
a	O
software	O
perspective	O
,	O
since	O
the	O
new	O
IBM	B-Device
PC	I-Device
was	O
using	O
8-bit	O
characters	O
,	O
there	O
were	O
128	O
new	O
characters	O
beyond	O
the	O
7-bit	B-Protocol
ASCII	I-Protocol
characters	O
which	O
could	O
be	O
used	O
.	O
</s>
<s>
ASCII	B-Protocol
only	O
defined	O
the	O
characters	O
with	O
numbers	O
from	O
0	O
through	O
127	O
,	O
so	O
the	O
numbers	O
from	O
128	O
to	O
255	O
,	O
which	O
had	O
the	O
high	O
bit	O
turned	O
on	O
,	O
were	O
not	O
defined	O
yet	O
.	O
</s>
