<s>
The	O
is	O
an	O
IBM	O
PC	O
compatible	O
system	O
with	O
an	O
integrated	O
Mega	B-Operating_System
Drive	I-Operating_System
,	O
developed	O
by	O
Sega	O
and	O
manufactured	O
by	O
IBM	O
in	O
1991	O
.	O
</s>
<s>
The	O
TeraDrive	B-Device
allowed	O
for	O
Mega	B-Operating_System
Drive	I-Operating_System
games	O
to	O
be	O
played	O
the	O
same	O
time	O
as	O
the	O
PC	O
section	O
is	O
being	O
used	O
,	O
as	O
it	O
is	O
possible	O
for	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
and	O
PC	O
hardware	O
to	O
interact	O
with	O
each	O
other	O
.	O
</s>
<s>
Sega	O
hoped	O
that	O
integrating	O
the	O
then	O
popular	O
Mega	B-Operating_System
Drive	I-Operating_System
console	O
into	O
an	O
IBM	O
PC	O
would	O
attract	O
potential	O
customers	O
wishing	O
to	O
purchase	O
a	O
PC	O
,	O
but	O
the	O
system	O
proved	O
unpopular	O
and	O
was	O
a	O
commercial	O
failure	O
.	O
</s>
<s>
One	O
of	O
the	O
main	O
processors	O
used	O
for	O
the	O
system	O
is	O
the	O
Intel	B-General_Concept
80286	I-General_Concept
,	O
which	O
was	O
released	O
in	O
1982	O
.	O
</s>
<s>
However	O
,	O
by	O
the	O
time	O
the	O
TeraDrive	B-Device
was	O
released	O
in	O
1991	O
,	O
this	O
processor	B-Architecture
was	O
almost	O
10	O
years	O
out	O
of	O
date	O
-	O
the	O
more	O
powerful	O
25MHz	O
Intel	B-General_Concept
80486	I-General_Concept
had	O
been	O
released	O
in	O
1989	O
,	O
making	O
the	O
TeraDrive	B-Device
's	O
central	O
processor	B-Architecture
2	O
generations	O
behind	O
its	O
time	O
.	O
</s>
<s>
The	O
system	O
also	O
contains	O
a	O
Motorola	B-Device
68000	I-Device
and	O
a	O
Zilog	B-General_Concept
Z80	I-General_Concept
,	O
the	O
same	O
processors	O
which	O
were	O
used	O
in	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
,	O
that	O
ran	O
at	O
7.67MHz	O
and	O
3.58MHz	O
respectively	O
.	O
</s>
<s>
The	O
machine	O
's	O
front	O
panel	O
ports	O
included	O
two	O
Mega	B-Operating_System
Drive	I-Operating_System
pad	O
ports	O
which	O
were	O
similar	O
in	O
design	O
to	O
9-pin	O
male	O
serial	B-Protocol
ports	I-Protocol
,	O
and	O
2	O
PS/2	B-Protocol
ports	I-Protocol
to	O
the	O
right	O
side	O
of	O
the	O
unit	O
to	O
accommodate	O
for	O
the	O
mouse	O
and	O
keyboard	O
.	O
</s>
<s>
In	O
order	O
from	O
left	O
to	O
right	O
:	O
9-pin	O
male	O
serial	B-Protocol
port	I-Protocol
,	O
25-pin	O
parallel	B-Device
port	I-Device
for	O
connection	O
to	O
a	O
printer	O
,	O
stereo	O
RCA	B-Protocol
jacks	I-Protocol
and	O
composite	O
NTSC	O
video	O
output	O
for	O
connection	O
to	O
a	O
TV	O
,	O
analogue	O
RGB	O
for	O
monitor	O
connection	O
,	O
and	O
a	O
2nd	O
9-pin	O
male	O
serial	B-Protocol
connector	I-Protocol
labelled	O
"	O
EXT	O
"	O
,	O
similar	O
to	O
that	O
found	O
on	O
the	O
rear	O
of	O
an	O
original	O
Mega	B-Operating_System
Drive	I-Operating_System
base	O
unit	O
.	O
</s>
<s>
The	O
motherboard	B-Device
also	O
had	O
a	O
spare	O
ISA	B-Architecture
slot	I-Architecture
available	O
for	O
expansion	O
,	O
with	O
a	O
hole	O
at	O
the	O
rear	O
of	O
the	O
unit	O
to	O
accommodate	O
this	O
.	O
</s>
<s>
Its	O
interface	B-Application
consisted	O
of	O
a	O
start-up	O
menu	O
with	O
several	O
options	O
,	O
including	O
a	O
file	B-Application
manager	I-Application
,	O
DOS	B-Device
,	O
a	O
clock	O
and	O
Mega	B-Operating_System
Drive	I-Operating_System
mode	O
.	O
</s>
<s>
The	O
machine	O
included	O
IBM	O
drivers	O
bundled	O
on	O
a	O
floppy	B-Device
disk	I-Device
,	O
which	O
enabled	O
properly	O
written	O
software	O
to	O
operate	O
in	O
the	O
machine	O
's	O
RAM	B-Architecture
and	O
then	O
run	O
on	O
the	O
native	O
Mega	B-Operating_System
Drive	I-Operating_System
hardware	O
.	O
</s>
<s>
A	O
good	O
example	O
of	O
this	O
shown	O
in	O
the	O
Puzzle	O
Construction	O
program	O
,	O
one	O
of	O
the	O
very	O
few	O
software	O
titles	O
included	O
with	O
the	O
TeraDrive	B-Device
,	O
which	O
included	O
a	O
PC-side	O
editor	O
suite	O
for	O
changing	O
the	O
features	O
of	O
a	O
falling-block	O
puzzle	O
game	O
,	O
then	O
playable	O
on	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
side	O
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
shipped	O
with	O
the	O
system	O
was	O
IBM	O
's	O
DOS	B-Device
J4.0/V	O
,	O
which	O
was	O
similar	O
to	O
PC	B-Operating_System
DOS	I-Operating_System
.	O
</s>
<s>
There	O
was	O
often	O
speculation	O
that	O
the	O
TeraDrive	B-Device
was	O
specifically	O
designed	O
as	O
a	O
purpose-made	O
development	B-Application
kit	I-Application
,	O
to	O
allow	O
software	O
makers	O
to	O
develop	O
their	O
software	O
titles	O
for	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
.	O
</s>
<s>
However	O
,	O
given	O
the	O
release	O
date	O
of	O
the	O
TeraDrive	B-Device
(	O
some	O
years	O
after	O
the	O
initial	O
Mega	B-Operating_System
Drive	I-Operating_System
release	O
)	O
,	O
as	O
well	O
as	O
the	O
availability	O
of	O
Sega	O
's	O
own	O
game	O
development	O
hardware	O
,	O
it	O
is	O
unlikely	O
the	O
TeraDrive	B-Device
was	O
designed	O
for	O
this	O
purpose	O
.	O
</s>
<s>
The	O
system	O
's	O
peripherals	O
which	O
were	O
included	O
or	O
available	O
separately	O
,	O
included	O
2	O
×	O
Mega	B-Operating_System
Drive	I-Operating_System
pads	O
,	O
1	O
×	O
PS/2	B-Protocol
Mouse	I-Protocol
,	O
1	O
×	O
Sega	O
branded	O
PS/2	B-Protocol
IBM	O
keyboard	O
and	O
1	O
×	O
3-button	O
joystick	O
.	O
</s>
<s>
The	O
Mouse	O
and	O
Mega	B-Operating_System
Drive	I-Operating_System
pads	O
were	O
practically	O
identical	O
to	O
those	O
found	O
on	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
console	O
version	O
.	O
</s>
<s>
A	O
monitor	O
which	O
was	O
manufactured	O
by	O
a	O
3rd	O
party	O
company	O
but	O
with	O
Sega	O
branding	O
,	O
was	O
available	O
separately	O
at	O
a	O
price	O
of	O
¥	O
79,800	O
(	O
estimated	O
USD	O
$	O
600/GBP	O
£300	O
at	O
the	O
time	O
)	O
,	O
which	O
was	O
capable	O
of	O
displaying	O
15kHz	O
RGB	O
video	O
signals	O
from	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
hardware	O
and	O
a	O
31kHz	O
VGA	B-Protocol
output	O
from	O
the	O
PC	O
hardware	O
,	O
both	O
from	O
the	O
VGA	B-Protocol
connector	O
.	O
</s>
<s>
The	O
price	O
to	O
buy	O
a	O
TeraDrive	B-Device
in	O
June	O
2003	O
was	O
triple	O
the	O
price	O
it	O
was	O
2	O
years	O
prior	O
.	O
</s>
<s>
but	O
this	O
likely	O
never	O
got	O
past	O
the	O
discussion	O
stages	O
due	O
to	O
the	O
failure	O
of	O
the	O
TeraDrive	B-Device
.	O
</s>
<s>
A	O
similar	O
,	O
but	O
unrelated	O
system	O
was	O
manufactured	O
by	O
Amstrad	O
and	O
sold	O
under	O
the	O
name	O
Mega	B-Device
PC	I-Device
in	O
PAL	B-Language
areas	O
such	O
as	O
Europe	O
and	O
Australia	O
.	O
</s>
<s>
Although	O
it	O
boasted	O
a	O
higher	O
specification	O
than	O
that	O
of	O
Sega	O
's	O
TeraDrive	B-Device
,	O
it	O
was	O
unable	O
to	O
act	O
as	O
a	O
Software	B-Application
Development	I-Application
Kit	I-Application
due	O
to	O
the	O
inability	O
to	O
interact	O
both	O
the	O
PC	O
and	O
the	O
Mega	B-Operating_System
Drive	I-Operating_System
together	O
,	O
as	O
it	O
was	O
essentially	O
just	O
a	O
PC	O
with	O
a	O
Mega	B-Operating_System
Drive	I-Operating_System
bundled	O
inside	O
.	O
</s>
