<s>
The	O
Spectre	B-Device
GCR	I-Device
is	O
a	O
hardware	O
and	O
software	O
package	O
for	O
the	O
Atari	B-Device
ST	I-Device
computers	O
.	O
</s>
<s>
The	O
hardware	O
consists	O
of	O
a	O
cartridge	O
that	O
plugs	O
into	O
the	O
Atari	B-Device
ST	I-Device
's	O
cartridge	O
port	O
and	O
a	O
cable	O
that	O
connects	O
between	O
the	O
cartridge	O
and	O
one	O
of	O
the	O
floppy	O
ports	O
on	O
the	O
ST	O
.	O
</s>
<s>
Designed	O
by	O
David	O
Small	O
and	O
sold	O
through	O
his	O
company	O
Gadgets	O
by	O
Small	O
,	O
it	O
allows	O
the	O
Atari	B-Device
ST	I-Device
to	O
run	O
most	O
Macintosh	B-Device
software	O
.	O
</s>
<s>
It	O
is	O
Small	O
's	O
third	O
Macintosh	B-Device
emulator	O
for	O
the	O
ST	O
,	O
replacing	O
his	O
previous	O
Magic	B-Device
Sac	I-Device
and	O
Spectre	O
128	O
.	O
</s>
<s>
The	O
Spectre	B-Device
GCR	I-Device
requires	O
the	O
owner	O
to	O
provide	O
official	O
Apple	O
Macintosh	B-Device
128K	I-Device
ROMs	O
and	O
Macintosh	B-Device
Operating	O
System	O
6.0.8	O
disks	O
.	O
</s>
<s>
The	O
emulator	O
runs	O
best	O
with	O
a	O
high-resolution	O
monochrome	B-Device
monitor	I-Device
,	O
such	O
as	O
Atari	O
's	O
own	O
SM124	O
,	O
but	O
will	O
run	O
on	O
color	O
displays	O
by	O
either	O
displaying	O
a	O
user-selectable	O
half	O
of	O
the	O
Macintosh	B-Device
screen	O
,	O
or	O
missing	O
out	O
alternate	O
lines	O
to	O
fit	O
the	O
lower	O
resolution	O
color	O
display	O
.	O
</s>
<s>
The	O
Spectre	B-Device
GCR	I-Device
plugs	O
into	O
the	O
cartridge	O
slot	O
and	O
floppy	O
port	O
,	O
and	O
modifies	O
the	O
frequency	O
of	O
the	O
data	O
to/from	O
the	O
single-speed	O
floppy	O
drive	O
of	O
the	O
Atari	B-Device
ST	I-Device
,	O
allowing	O
it	O
to	O
read	O
Macintosh	B-Device
GCR	O
format	O
discs	O
which	O
require	O
a	O
multi-speed	O
floppy	O
drive	O
.	O
</s>
<s>
Although	O
Spectre	B-Device
GCR	I-Device
runs	O
in	O
1MB	O
of	O
memory	O
,	O
2MB	O
or	O
more	O
is	O
recommended	O
.	O
</s>
