<s>
MacMach	B-Operating_System
is	O
a	O
computer	B-General_Concept
operating	I-General_Concept
system	I-General_Concept
from	O
the	O
early	O
1990s	O
,	O
developed	O
by	O
Carnegie	O
Mellon	O
University	O
.	O
</s>
<s>
Architecturally	O
,	O
it	O
consists	O
of	O
Berkeley	B-Operating_System
Software	I-Operating_System
Distribution	I-Operating_System
(	O
BSD	B-Operating_System
)	O
4.3	O
code	O
running	O
on	O
the	O
Mach	B-Operating_System
microkernel	I-Operating_System
,	O
with	O
the	O
Apple	O
Macintosh	B-Operating_System
System	I-Operating_System
7	I-Operating_System
running	O
experimentally	O
as	O
a	O
Mach	B-Operating_System
task	B-General_Concept
.	O
</s>
<s>
The	O
entire	O
system	O
runs	O
on	O
Macintoshes	B-Device
based	O
on	O
the	O
Motorola	B-Device
68000	I-Device
series	I-Device
(	O
68k	B-Device
)	O
family	O
of	O
microprocessors	B-Architecture
.	O
</s>
