<s>
The	O
CD64	B-Device
is	O
a	O
game	B-Device
backup	I-Device
device	I-Device
made	O
by	O
UFO/Success	O
Company	O
for	O
the	O
Nintendo	B-Operating_System
64	I-Operating_System
that	O
allows	O
users	O
to	O
run	O
ROM	B-General_Concept
files	I-General_Concept
off	O
a	O
CD-ROM	O
attached	O
to	O
the	O
system	O
.	O
</s>
<s>
Similar	O
to	O
the	O
Doctor	B-Device
V64	I-Device
and	O
the	O
Z64	B-Application
units	O
for	O
the	O
N64	B-Operating_System
,	O
it	O
is	O
most	O
commonly	O
used	O
for	O
playing	O
backups	O
of	O
Nintendo	B-Operating_System
64	I-Operating_System
games	O
.	O
</s>
<s>
Since	O
it	O
has	O
a	O
built-in	O
communications	O
port	O
that	O
is	O
accessible	O
from	O
the	O
N64	B-Operating_System
program	O
,	O
it	O
can	O
also	O
be	O
used	O
as	O
a	O
rather	O
versatile	O
development/debug	O
device	O
.	O
</s>
<s>
The	O
CD64	B-Device
sits	O
underneath	O
the	O
N64	B-Operating_System
unit	O
,	O
making	O
use	O
of	O
the	O
EXTension	O
port	O
on	O
the	O
bottom	O
of	O
the	O
console	O
.	O
</s>
<s>
Once	O
connected	O
and	O
plugged	O
in	O
,	O
a	O
game	O
cartridge	O
is	O
taken	O
out	O
of	O
the	O
N64	B-Operating_System
and	O
one	O
is	O
placed	O
into	O
the	O
slot	O
on	O
the	O
face	O
of	O
the	O
system	O
,	O
just	O
underneath	O
the	O
N64	B-Operating_System
and	O
just	O
above	O
the	O
CD-ROM	O
drive	O
,	O
to	O
act	O
as	O
a	O
kind	O
of	O
boot	B-Operating_System
disk	I-Operating_System
.	O
</s>
<s>
When	O
the	O
unit	O
is	O
turned	O
on	O
,	O
via	O
the	O
N64	B-Operating_System
power	O
button	O
,	O
a	O
GUI	O
is	O
shown	O
where	O
you	O
can	O
choose	O
to	O
launch	O
the	O
game	O
in	O
the	O
slot	O
,	O
or	O
run	O
the	O
ROM	B-General_Concept
file	I-General_Concept
on	O
the	O
CD	O
in	O
the	O
CD-ROM	O
.	O
</s>
<s>
The	O
ROM	B-General_Concept
file	I-General_Concept
is	O
loaded	O
into	O
the	O
PC	O
RAM	B-Architecture
found	O
within	O
the	O
system	O
.	O
</s>
<s>
The	O
first	O
version	O
of	O
the	O
unit	O
was	O
solid	O
black	O
,	O
like	O
the	O
N64	B-Operating_System
itself	O
,	O
and	O
had	O
only	O
128Mb	O
of	O
RAM	B-Architecture
.	O
</s>
<s>
While	O
upgradeable	O
,	O
the	O
RAM	B-Architecture
was	O
usually	O
glued	O
into	O
place	O
with	O
a	O
hot	O
glue	O
gun	O
.	O
</s>
<s>
The	O
second	O
version	O
,	O
known	O
as	O
the	O
CD64+	O
(	O
or	O
'	O
Plus	O
 '	O
)	O
was	O
apparently	O
more	O
stable	O
than	O
the	O
first	O
and	O
was	O
transparent	O
grey	O
.	O
</s>
<s>
Earlier	O
CD64	B-Device
models	O
were	O
able	O
to	O
power	O
themselves	O
directly	O
from	O
the	O
N64	B-Operating_System
's	O
expansion	O
bus	O
,	O
but	O
later	O
models	O
require	O
an	O
external	O
power	O
adaptor	O
.	O
</s>
<s>
The	O
N64	B-Operating_System
boots	O
the	O
CD64	B-Device
BIOS	O
using	O
the	O
6102	O
CIC	B-Device
in	O
the	O
boot	B-Device
cartridge	I-Device
.	O
</s>
<s>
The	O
CD64	B-Device
then	O
boots	O
a	O
program	O
from	O
its	O
cartridge	O
emulator	O
memory	O
using	O
a	O
built-in	O
boot	O
emulator	O
.	O
</s>
<s>
This	O
presents	O
problems	O
for	O
running	O
programs	O
which	O
have	O
secondary	O
protections	O
against	O
boot	O
emulators	O
,	O
because	O
unlike	O
the	O
V64	O
and	O
V64Jr	O
,	O
and	O
due	O
to	O
the	O
necessity	O
of	O
the	O
CD64	B-Device
BIOS	O
to	O
launch	O
a	O
program	O
,	O
it	O
is	O
impossible	O
to	O
use	O
a	O
cartridge	O
with	O
a	O
different	O
boot	O
CIC	B-Device
than	O
the	O
6102	O
with	O
the	O
CD64	B-Device
.	O
</s>
<s>
The	O
CD64	B-Device
supports	O
.v64	O
and	O
.z64	O
files	O
.	O
</s>
<s>
After	O
burning	O
the	O
ROM	B-General_Concept
files	I-General_Concept
onto	O
a	O
disc	O
they	O
can	O
be	O
launched	O
from	O
the	O
GUI	O
.	O
</s>
<s>
The	O
CD64	B-Device
unit	O
has	O
SRAM	B-Architecture
support	O
and	O
can	O
connect	O
with	O
a	O
PC	O
to	O
dump	O
the	O
ROM	B-General_Concept
image	I-General_Concept
from	O
the	O
inserted	O
cart	O
and	O
transfer	O
save	O
files	O
and	O
ROM	B-General_Concept
files	I-General_Concept
back	O
and	O
forth	O
.	O
</s>
<s>
Requires	O
6102	O
(	O
NTSC	O
)	O
or	O
7101	O
(	O
PAL	B-Language
)	O
CIC	B-Device
boot	B-Device
cartridge	I-Device
.	O
</s>
<s>
Replaceable	O
4x	O
TEAC	O
ATAPI	O
low-power	O
laptop	B-Device
CD-ROM	O
drive	O
.	O
</s>
<s>
Replaceable	O
PC-compatible	O
128Mb	O
EDO	O
SIMM	B-General_Concept
,	O
upgradable	O
to	O
256Mb	O
.	O
</s>
<s>
Optional	O
high-speed	O
Pro	O
Comms	O
Link	O
ISA	B-Architecture
card	I-Architecture
or	O
Parallel	B-Device
Port	I-Device
Adapter	O
(	O
DB-25	B-Protocol
,	O
8-bit	O
dual	O
register	O
with	O
handshake	B-Protocol
)	O
for	O
communication	O
with	O
PCs	B-Device
.	O
</s>
<s>
Optional	O
Protected	O
Cart	O
Decoder	O
for	O
dumping	O
protected	O
(	O
non	O
6102/7101	O
CIC	B-Device
)	O
cartridges	O
.	O
</s>
<s>
Can	O
also	O
be	O
used	O
to	O
access	O
the	O
save	O
chips	O
(	O
EEPROM	B-General_Concept
,	O
SRAM	B-Architecture
or	O
Flash	B-Device
memory	I-Device
)	O
from	O
protected	O
cartridges	O
.	O
</s>
