<s>
PTDOS	B-Operating_System
or	O
Processor	O
Technology	O
Disk	O
Operating	B-General_Concept
System	I-General_Concept
is	O
an	O
operating	B-General_Concept
system	I-General_Concept
created	O
in	O
the	O
late	O
1970s	O
for	O
computers	O
using	O
the	O
Intel	B-General_Concept
8080	I-General_Concept
microprocessor	O
and	O
the	O
Processor	O
Technology	O
Helios	O
II	O
Disk	O
Memory	O
System	O
.	O
</s>
<s>
The	O
following	O
list	O
of	O
commands	B-Application
is	O
supported	O
by	O
PTDOS	B-Operating_System
1.4	O
.	O
</s>
