<s>
The	O
Macintosh	B-Device
Quadra	I-Device
610	I-Device
,	O
originally	O
sold	O
as	O
the	O
Macintosh	B-Device
Centris	I-Device
610	I-Device
,	O
is	O
a	O
personal	B-Device
computer	I-Device
designed	O
,	O
manufactured	O
and	O
sold	O
by	O
Apple	O
Computer	O
from	O
February	O
1993	O
to	O
July	O
1994	O
.	O
</s>
<s>
The	O
Centris	B-Device
610	I-Device
was	O
introduced	O
alongside	O
the	O
larger	O
Centris	B-Device
650	I-Device
as	O
the	O
replacement	O
for	O
the	O
Macintosh	B-Device
IIsi	I-Device
,	O
and	O
it	O
was	O
intended	O
as	O
the	O
start	O
of	O
the	O
new	O
midrange	O
Centris	B-Device
line	O
of	O
computers	O
.	O
</s>
<s>
Later	O
in	O
1993	O
,	O
Apple	O
decided	O
to	O
follow	O
an	O
emerging	O
industry	O
trend	O
of	O
naming	O
product	O
families	O
for	O
their	O
target	O
customers	O
Quadra	B-Device
for	O
business	O
,	O
LC	O
for	O
education	O
,	O
and	O
Performa	O
for	O
home	O
and	O
folded	O
the	O
Centris	B-Device
610	I-Device
into	O
the	O
Quadra	B-Device
family	O
.	O
</s>
<s>
The	O
610	O
is	O
the	O
second	O
Macintosh	O
case	O
design	O
(	O
after	O
the	O
Macintosh	B-Device
LC	I-Device
family	I-Device
)	O
to	O
use	O
a	O
pizza	B-General_Concept
box	I-General_Concept
form	I-General_Concept
factor	I-General_Concept
;	O
it	O
was	O
later	O
used	O
for	O
the	O
Centris	B-Device
/	I-Device
Quadra	I-Device
660AV	I-Device
and	O
the	O
Power	B-Device
Macintosh	I-Device
6100	I-Device
.	O
</s>
<s>
The	O
Quadra	B-Device
610	I-Device
was	O
also	O
sold	O
in	O
a	O
"	O
DOS	B-Device
compatible	O
"	O
model	O
with	O
an	O
additional	O
486SX	B-Device
processor	O
at	O
25MHz	O
on	O
a	O
Processor	B-Device
Direct	I-Device
Slot	I-Device
card	O
.	O
</s>
<s>
A	O
server	O
variant	O
,	O
the	O
Workgroup	B-Device
Server	I-Device
60	I-Device
,	O
was	O
introduced	O
in	O
July	O
1993	O
with	O
a	O
20MHz	O
processor	O
,	O
which	O
received	O
the	O
same	O
25MHz	O
upgrade	O
in	O
October	O
.	O
</s>
<s>
A	O
"	O
DOS	B-Device
Compatible	O
"	O
version	O
was	O
introduced	O
in	O
February	O
1994	O
as	O
a	O
way	O
for	O
Apple	O
to	O
judge	O
whether	O
the	O
market	O
would	O
be	O
interested	O
in	O
a	O
Macintosh	O
that	O
could	O
also	O
run	O
DOS	B-Device
.	O
</s>
<s>
The	O
Quadra	B-Device
610	I-Device
was	O
replaced	O
with	O
the	O
Quadra	B-Device
630	I-Device
in	O
July	O
1994	O
,	O
and	O
the	O
Workgroup	B-Device
Server	I-Device
6150	I-Device
replaced	O
the	O
Workgroup	B-Device
Server	I-Device
60	I-Device
as	O
Apple	O
's	O
entry-level	O
server	O
offering	O
.	O
</s>
<s>
Standard	O
equipment	O
on	O
all	O
Centris	B-Device
610	I-Device
models	O
includes	O
onboard	O
video	O
(	O
with	O
VGA	O
support	O
via	O
an	O
adapter	O
)	O
,	O
two	O
ADB	B-Device
and	O
two	O
serial	O
ports	O
,	O
and	O
an	O
external	O
SCSI	O
connector	O
.	O
</s>
<s>
There	O
are	O
two	O
SIMM	B-General_Concept
slots	O
that	O
support	O
4	O
,	O
8	O
,	O
16	O
,	O
and	O
32	O
MB	O
SIMMs	B-General_Concept
,	O
allowing	O
for	O
a	O
68	O
MB	O
of	O
RAM	O
.	O
</s>
<s>
Ethernet-capable	O
models	O
have	O
an	O
AAUI	B-Protocol
port	O
.	O
</s>
<s>
There	O
are	O
no	O
NuBus	B-Device
slots	O
;	O
an	O
optional	O
expansion	O
card	O
was	O
offered	O
that	O
plugs	O
into	O
the	O
Processor	B-Device
Direct	I-Device
Slot	I-Device
and	O
allows	O
a	O
single	O
7-inch	O
NuBus	B-Device
card	O
to	O
be	O
installed	O
in	O
a	O
horizontal	O
orientation	O
.	O
</s>
<s>
This	O
arrangement	O
initially	O
precluded	O
the	O
use	O
of	O
the	O
full	O
68040	B-Device
processor	O
as	O
there	O
was	O
insufficient	O
clearance	O
for	O
a	O
heat	O
sink	O
,	O
something	O
the	O
68LC040	O
does	O
not	O
require	O
.	O
</s>
<s>
This	O
was	O
no	O
longer	O
an	O
issue	O
by	O
the	O
time	O
the	O
Quadra	B-Device
610	I-Device
DOS	B-Device
Compatible	O
was	O
released	O
,	O
which	O
included	O
a	O
full	O
68040	B-Device
CPU	O
.	O
</s>
<s>
When	O
the	O
Centris	B-Device
610	I-Device
was	O
first	O
introduced	O
,	O
only	O
a	O
few	O
7-inch	O
NuBus	B-Device
cards	O
existed	O
;	O
most	O
were	O
12	O
inches	O
.	O
</s>
<s>
The	O
smaller	O
size	O
was	O
part	O
of	O
an	O
upcoming	O
update	O
to	O
the	O
NuBus	B-Device
standard	O
.	O
</s>
<s>
System	B-Operating_System
7.1	I-Operating_System
was	O
included	O
as	O
standard	O
,	O
with	O
Mac	B-Operating_System
OS	I-Operating_System
8.1	I-Operating_System
being	O
the	O
highest	O
supported	O
version	O
.	O
</s>
<s>
Versions	O
with	O
a	O
full	O
68040	B-Device
processor	O
can	O
also	O
run	O
A/UX	B-Operating_System
with	O
the	O
appropriate	O
Enablers	O
.	O
</s>
<s>
Macintosh	B-Device
Centris	I-Device
610	I-Device
:	O
Sold	O
in	O
four	O
configurations	O
:	O
</s>
<s>
Workgroup	B-Device
Server	I-Device
60	I-Device
:	O
68040	B-Device
at	O
20MHz	O
,	O
8	O
MB	O
ram	O
(	O
onboard	O
)	O
,	O
250	O
or	O
500	O
MB	O
HDD	O
.	O
</s>
<s>
Macintosh	B-Device
Quadra	I-Device
610	I-Device
:	O
68LC040	O
or	O
68040	B-Device
at	O
25MHz	O
,	O
160	O
or	O
230	O
MB	O
HDD	O
.	O
</s>
<s>
Macintosh	B-Device
Quadra	I-Device
610	I-Device
DOS	I-Device
Compatible	I-Device
:	O
68040	B-Device
at	O
25MHz	O
,	O
160	O
or	O
230	O
MB	O
HDD	O
;	O
the	O
DOS	B-Device
card	O
occupies	O
the	O
PDS	B-Device
slot	I-Device
and	O
includes	O
an	O
Intel	O
486SX-25	O
and	O
has	O
a	O
72-pin	O
SIMM	B-General_Concept
slot	O
which	O
supports	O
up	O
to	O
32	O
MB	O
RAM	O
.	O
</s>
