<s>
Apollo/Domain	B-Device
was	O
a	O
range	O
of	O
workstations	B-Device
developed	O
and	O
produced	O
by	O
Apollo	O
Computer	O
from	O
circa	O
1980	O
to	O
1989	O
.	O
</s>
<s>
The	O
machines	O
were	O
built	O
around	O
the	O
Motorola	B-Device
68k	I-Device
family	O
of	O
processors	O
,	O
except	O
for	O
the	O
DN10000	O
,	O
which	O
had	O
from	O
one	O
to	O
four	O
of	O
Apollo	O
's	O
RISC	B-Architecture
processors	I-Architecture
,	O
named	O
PRISM	B-General_Concept
.	O
</s>
<s>
The	O
original	O
operating	B-General_Concept
system	I-General_Concept
was	O
Apollo	O
's	O
own	O
product	O
called	O
Aegis	O
,	O
which	O
was	O
later	O
renamed	O
to	O
Domain/OS	B-Application
.	O
</s>
<s>
The	O
Aegis	O
and	O
Domain/OS	B-Application
system	O
offered	O
advanced	O
features	O
for	O
the	O
time	O
,	O
for	O
example	O
an	O
object	O
oriented	O
filesystem	O
,	O
network	O
transparency	O
,	O
diskless	B-Device
booting	I-Device
,	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
and	O
,	O
in	O
Domain/OS	B-Application
,	O
interoperability	O
with	O
BSD	B-Operating_System
,	O
System	B-Operating_System
V	I-Operating_System
and	O
POSIX	O
.	O
</s>
<s>
An	O
Apollo	O
workstation	B-Device
resembled	O
a	O
modern	O
PC	O
,	O
with	O
base	O
unit	O
,	O
keyboard	O
,	O
mouse	O
,	O
and	O
screen	O
.	O
</s>
<s>
Originally	O
the	O
only	O
option	O
was	O
the	O
12Mbit/s	O
Apollo	O
Token	B-Device
Ring	I-Device
(	O
ATR	O
)	O
.	O
</s>
<s>
It	O
has	O
been	O
stated	O
that	O
the	O
IBM	B-Device
Token	I-Device
Ring	I-Device
was	O
an	O
option	O
-	O
this	O
was	O
never	O
available	O
.	O
</s>
<s>
Apollo	O
Token	B-Device
Ring	I-Device
networks	I-Device
used	O
75	O
ohm	O
RG-6U	O
coaxial	O
cabling	O
.	O
</s>
<s>
The	O
network	O
orientation	O
of	O
the	O
systems	O
,	O
together	O
with	O
the	O
ATR	O
functionality	O
,	O
made	O
it	O
easy	O
and	O
practicable	O
to	O
boot	O
and	O
run	O
diskless	B-Device
machines	I-Device
using	O
another	O
machine	O
's	O
OS	O
.	O
</s>
<s>
In	O
principle	O
,	O
as	O
many	O
machines	O
could	O
be	O
booted	O
from	O
one	O
host	O
as	O
it	O
could	O
cope	O
with	O
;	O
in	O
practice	O
,	O
four	O
diskless	B-Device
machines	I-Device
from	O
one	O
host	O
was	O
about	O
the	O
limit	O
.	O
</s>
<s>
Provided	O
the	O
correct	O
machine-specific	O
software	O
was	O
installed	O
on	O
the	O
host	O
(	O
again	O
,	O
very	O
easy	O
)	O
,	O
any	O
type	O
of	O
machine	O
could	O
be	O
booted	O
from	O
any	O
other	O
(	O
one	O
complication	O
being	O
that	O
a	O
DN10000	O
could	O
only	O
be	O
booted	O
from	O
another	O
DN10000	O
or	O
a	O
68K-based	O
system	O
which	O
had	O
"	O
cmpexe	O
"	O
compound	O
executables	O
installed	O
)	O
.	O
</s>
<s>
Some	O
systems	O
could	O
have	O
the	O
graphics	O
card	O
removed	O
so	O
that	O
they	O
could	O
be	O
used	O
as	O
a	O
servers	O
;	O
in	O
such	O
a	O
case	O
the	O
keyboard	O
and	O
mouse	O
were	O
automatically	O
ignored	O
,	O
and	O
the	O
system	O
accessed	O
either	O
across	O
the	O
network	O
,	O
or	O
via	O
a	O
dumb	O
terminal	O
plugged	O
into	O
the	O
machine	O
's	O
serial	B-Protocol
port	I-Protocol
.	O
</s>
<s>
The	O
first	O
model	O
was	O
the	O
DN416	O
workstation	B-Device
,	O
later	O
referred	O
to	O
as	O
the	O
DN100	O
after	O
the	O
green	O
screen	O
was	O
substituted	O
with	O
a	O
black	O
and	O
white	O
screen	O
.	O
</s>
<s>
Later	O
models	O
were	O
based	O
on	O
68010	B-Device
,	O
68020	B-Device
,	O
68030	B-Device
and	O
68040	B-Device
processors	O
which	O
had	O
native	O
support	O
for	O
virtual	O
memory	O
.	O
</s>
<s>
Some	O
workstations	B-Device
had	O
bit-slice	O
CPU	O
implementations	O
that	O
were	O
instruction	O
set	O
compatible	O
with	O
the	O
68000	O
.	O
</s>
<s>
The	O
DSP90	O
was	O
a	O
fileserver	O
built	O
using	O
a	O
standard	O
Multibus	B-Protocol
backplane	O
and	O
I/O	O
controllers	O
.	O
</s>
<s>
The	O
disk	O
controller	O
could	O
support	O
up	O
to	O
four	O
(	O
4	O
)	O
500MB	O
hard	B-Device
drives	I-Device
.	O
</s>
<s>
The	O
DN300	O
and	O
later	O
DN330	O
were	O
integrated	O
desktop	B-General_Concept
systems	I-General_Concept
not	O
much	O
bigger	O
than	O
the	O
included	O
monitor	O
.	O
</s>
<s>
The	O
DN3000	O
and	O
DN4000	O
used	O
68020	B-Device
processors	O
,	O
but	O
were	O
housed	O
in	O
IBM	O
PC	O
style	O
cases	O
of	O
the	O
time	O
and	O
had	O
IBM-AT	O
compatible	O
ISA	O
expansion	O
slots	O
and	O
PC-compatible	O
disk	O
drives	O
.	O
</s>
<s>
A	O
typical	O
system	O
could	O
have	O
between	O
2MiB	O
and	O
32MiB	O
of	O
memory	O
,	O
a	O
76MB	O
,	O
150MB	O
or	O
330MB	O
(	O
very	O
occasionally	O
660MB	O
)	O
hard	B-Device
disk	I-Device
,	O
and	O
32-bit	O
68020	B-Device
or	O
68030	B-Device
processor	O
running	O
at	O
12MHz	O
to	O
33MHz	O
,	O
depending	O
on	O
model	O
.	O
</s>
<s>
A	O
half-height	O
expansion	O
bay	O
could	O
take	O
either	O
a	O
5¼-inch	O
floppy	B-Device
disk	I-Device
drive	I-Device
or	O
a	O
QIC-type	O
cartridge	O
tape	O
drive	O
,	O
capacity	O
30MB	O
,	O
45MB	O
,	O
or	O
60MB	O
depending	O
on	O
cartridge	O
.	O
</s>
<s>
For	O
printer	O
access	O
,	O
the	O
system	O
came	O
with	O
a	O
serial	B-Protocol
port	I-Protocol
as	O
standard	O
;	O
a	O
serial/parallel	O
expansion	O
card	O
could	O
provide	O
a	O
parallel	O
printer	O
port	O
if	O
this	O
was	O
required	O
.	O
</s>
<s>
The	O
DN3000	O
and	O
DN4000	O
were	O
later	O
upgraded	O
to	O
DN3500	O
and	O
DN4500	O
with	O
a	O
faster	O
68030	B-Device
CPU	O
.	O
</s>
<s>
A	O
DN5500	O
with	O
a	O
68040	B-Device
was	O
also	O
produced	O
in	O
limited	O
quantities	O
.	O
</s>
<s>
A	O
DN2500	O
workstation	B-Device
was	O
released	O
which	O
was	O
advertised	O
as	O
"	O
4	O
Mips	O
,	O
4	O
MB	O
of	O
memory	O
,	O
for	O
under	O
$	O
4,000	O
"	O
.	O
</s>
<s>
After	O
the	O
purchase	O
of	O
Apollo	O
Computer	O
by	O
HP	O
,	O
a	O
merged	O
line	O
of	O
workstations	B-Device
that	O
could	O
run	O
either	O
Domain/OS	B-Application
or	O
HP-UX	B-Application
was	O
produced	O
with	O
the	O
name	O
HP/Apollo	O
425t	O
and	O
HP/Apollo	O
433s	O
.	O
</s>
<s>
PC	O
compatibility	O
was	O
possible	O
either	O
through	O
software	B-Application
emulation	I-Application
,	O
using	O
the	O
optional	O
product	O
DPCE	O
,	O
or	O
through	O
a	O
plug-in	O
card	O
carrying	O
an	O
Intel	B-General_Concept
80286	I-General_Concept
processor	O
.	O
</s>
<s>
A	O
third-party	O
plug-in	O
card	O
with	O
a	O
386	B-General_Concept
was	O
also	O
available	O
.	O
</s>
<s>
An	O
Apollo	O
Token	B-Device
Ring	I-Device
network	I-Device
card	O
could	O
also	O
be	O
placed	O
in	O
a	O
standard	O
PC	O
and	O
network	O
drivers	O
allowed	O
it	O
to	O
connect	O
to	O
a	O
server	O
running	O
a	O
PC	O
SMB	O
(	O
Server	O
Message	O
Block	O
)	O
file	O
server	O
.	O
</s>
<s>
Although	O
Apollo	O
systems	O
were	O
easy	O
to	O
use	O
and	O
administer	O
,	O
they	O
became	O
less	O
cost-effective	O
because	O
the	O
proprietary	O
operating	B-General_Concept
system	I-General_Concept
made	O
software	O
more	O
expensive	O
than	O
Unix	B-Application
software	O
.	O
</s>
<s>
The	O
68K	B-Device
processors	O
were	O
slower	O
than	O
the	O
new	O
RISC	B-Architecture
chips	O
from	O
Sun	O
and	O
Hewlett-Packard	O
.	O
</s>
<s>
Apollo	O
addressed	O
both	O
problems	O
by	O
introducing	O
the	O
RISC-based	B-Architecture
DN10000	O
and	O
Unix-friendly	O
Domain/OS	B-Application
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
However	O
,	O
the	O
DN10000	O
,	O
though	O
fast	O
,	O
was	O
extremely	O
expensive	O
,	O
and	O
a	O
reliable	O
version	O
of	O
Domain/OS	B-Application
came	O
too	O
late	O
to	O
make	O
a	O
difference	O
.	O
</s>
<s>
The	O
increased	O
speed	O
and	O
falling	O
price	O
of	O
PCs	O
ensured	O
the	O
obsolescence	O
of	O
high	O
end	O
systems	O
such	O
as	O
Apollo	O
workstations	B-Device
.	O
</s>
<s>
They	O
later	O
released	O
the	O
DN2500	O
series	O
workstation	B-Device
,	O
a	O
cheap	O
alternative	O
to	O
the	O
DN3x00/4x00	O
series	O
,	O
and	O
later	O
still	O
the	O
HP	B-Device
9000	I-Device
Series	O
400	O
line	O
,	O
which	O
could	O
run	O
either	O
HP	O
's	O
own	O
flavor	O
of	O
Unix	B-Application
,	O
HP-UX	B-Application
,	O
or	O
Domain/OS	B-Application
.	O
</s>
<s>
In	O
this	O
case	O
,	O
the	O
choice	O
had	O
to	O
be	O
made	O
at	O
time	O
of	O
purchase	O
,	O
partly	O
because	O
HP-UX	B-Application
and	O
Domain/OS	B-Application
functionality	O
required	O
different	O
keyboards	O
and	O
mice	O
.	O
</s>
