<s>
ISIS	B-Operating_System
,	O
short	O
for	O
Intel	B-Operating_System
System	I-Operating_System
Implementation	I-Operating_System
Supervisor	I-Operating_System
,	O
is	O
an	O
operating	B-General_Concept
system	I-General_Concept
for	O
early	O
Intel	O
microprocessors	B-Architecture
like	O
the	O
8080	B-General_Concept
.	O
</s>
<s>
It	O
was	O
originally	O
developed	O
by	O
Ken	O
Burgett	O
and	O
Jim	O
Stein	O
under	O
the	O
management	O
of	O
Steve	O
Hanna	O
and	O
Terry	O
Opdendyk	O
for	O
the	O
Intel	O
Microprocessor	B-Architecture
Development	O
System	O
with	O
two	O
8	B-Device
"	I-Device
floppy	B-Device
drives	I-Device
,	O
starting	O
in	O
1975	O
,	O
and	O
later	O
adopted	O
as	O
ISIS-II	O
as	O
the	O
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
PL/M	B-Language
compiler	O
,	O
assembler	B-Language
,	O
link	O
editor	O
,	O
and	O
In-Circuit	O
Emulator	O
(	O
developed	O
by	O
Steve	O
Morse	O
)	O
.	O
</s>
<s>
The	O
ISIS	B-Operating_System
operating	B-General_Concept
system	I-General_Concept
was	O
developed	O
on	O
an	O
early	O
prototype	O
of	O
the	O
MDS	O
800	O
computer	O
,	O
the	O
same	O
type	O
of	O
hardware	O
that	O
Gary	O
Kildall	O
used	O
to	O
develop	O
CP/M	B-Application
.	O
</s>
<s>
Communication	O
with	O
the	O
user	O
is	O
terminal-like	O
.	O
</s>
<s>
Its	O
user	O
interface	O
is	O
somewhat	O
CP/M	B-Application
-like	I-Application
,	O
even	O
from	O
the	O
program	O
interface	O
point	O
of	O
view	O
.	O
</s>
<s>
Each	O
device	O
has	O
a	O
name	O
,	O
which	O
is	O
entered	O
between	O
a	O
pair	O
of	O
colons	O
(	O
:	O
F0	O
:	O
and	O
:F1	O
:	O
are	O
floppies	B-Device
,	O
:LP	O
:	O
is	O
printer	O
,	O
etc	O
.	O
)	O
.	O
</s>
<s>
Each	O
diskette	B-Device
has	O
one	O
directory	O
and	O
no	O
subdirectories	O
.	O
</s>
<s>
ISIS-II	O
has	O
been	O
distributed	O
as	O
part	O
of	O
the	O
Intel	O
Microprocessor	B-Architecture
Development	O
System	O
and	O
includes	O
standard	O
operating	B-General_Concept
system	I-General_Concept
commands	B-Application
(	O
COPY	B-Device
,	O
DELETE	B-Device
,	O
DIR	B-Device
,	O
RENAME	B-Device
,	O
FORMAT	B-Application
)	O
and	O
debugging	O
software	O
(	O
assembler	B-Language
,	O
linker	O
and	O
debugger	O
for	O
external	O
debugging	O
in	O
the	O
developed	O
device	O
)	O
.	O
</s>
<s>
File	O
editing	O
is	O
provided	O
directly	O
on	O
diskette	B-Device
(	O
a	O
.BAK	O
file	O
is	O
always	O
created	O
)	O
.	O
</s>
<s>
ISIS-II	O
needed	O
at	O
least	O
32	O
kilobytes	O
of	O
RAM	B-Architecture
,	O
the	O
8080/8085	O
CPU	O
maximum	O
address	B-General_Concept
space	I-General_Concept
was	O
64	O
kilobytes	O
.	O
</s>
<s>
Floppy	B-Device
disk	I-Device
format	B-Application
was	O
8-inch	O
single-sided	O
,	O
250KB	O
single-sided	O
,	O
single-density	O
FM	O
,	O
or	O
500KB	O
single-sided	O
,	O
double-density	O
MMFM	O
.	O
</s>
<s>
ISIS-PDS	O
was	O
also	O
software	O
and	O
media	O
incompatible	O
and	O
unique	O
,	O
it	O
came	O
on	O
720KB	O
DSDD	O
5¼-inch	O
floppies	B-Device
with	O
the	O
Intel	O
personal	O
development	O
system	O
(	O
iPDS-100	O
)	O
.	O
</s>
<s>
The	O
ISIS-IV	O
operating	B-General_Concept
system	I-General_Concept
was	O
another	O
incompatible	O
(	O
even	O
with	O
other	O
Intel	O
development	O
systems	O
)	O
that	O
ran	O
on	O
the	O
iMDX-430	O
Series-IV	O
Network	O
Development	O
System-II	O
.	O
</s>
<s>
Intel	O
ASM80	O
,	O
PLM-80	O
,	O
BASIC-80	O
,	O
COBOL-80	O
,	O
FORTRAN-80	O
were	O
all	O
available	O
for	O
ISIS-II	O
.	O
</s>
<s>
The	O
following	O
list	O
of	O
commands	B-Application
are	O
supported	O
by	O
the	O
ISIS-II	O
console	O
.	O
</s>
