<s>
High	B-Application
Level	I-Application
Assembler	I-Application
or	O
HLASM	B-Device
is	O
IBM	O
's	O
current	O
assembler	B-Language
programming	I-Language
language	O
for	O
its	O
z/OS	B-Application
,	O
z/VSE	B-Application
,	O
z/VM	B-Application
and	O
z/TPF	B-Operating_System
operating	B-General_Concept
systems	I-General_Concept
on	O
z/Architecture	B-Device
mainframe	B-Architecture
computers	I-Architecture
.	O
</s>
<s>
There	O
is	O
also	O
a	O
version	O
that	O
runs	O
on	O
Linux	B-Application
,	O
primarily	O
intended	O
for	O
systems	O
running	O
on	O
a	O
z/Architecture	B-Device
system	O
(	O
this	O
environment	O
is	O
sometimes	O
referred	O
to	O
as	O
Linux	B-Application
on	I-Application
IBM	I-Application
Z	I-Application
)	O
.	O
</s>
<s>
HLASM	B-Device
was	O
released	O
in	O
June	O
1992	O
replacing	O
IBM	O
's	O
Assembler	B-Language
H	O
Version	O
2	O
.	O
</s>
<s>
Despite	O
the	O
name	O
,	O
HLASM	B-Device
on	O
its	O
own	O
does	O
not	O
have	O
many	O
of	O
the	O
features	O
normally	O
associated	O
with	O
a	O
high-level	B-Application
assembler	I-Application
,	O
but	O
does	O
offer	O
a	O
number	O
of	O
improvements	O
over	O
Assembler	B-Language
H	O
and	O
Assembler(XF )	O
,	O
such	O
as	O
labeled	O
and	O
dependent	O
USINGs	O
,	O
more	O
complete	O
cross-reference	O
information	O
,	O
and	O
additional	O
macro	O
language	O
capabilities	O
such	O
as	O
the	O
ability	O
to	O
write	O
user-defined	O
functions	O
.	O
</s>
<s>
While	O
working	O
at	O
IBM	O
,	O
John	O
Robert	O
Ehrman	O
created	O
and	O
was	O
the	O
lead	O
developer	O
for	O
HLASM	B-Device
and	O
is	O
considered	O
the	O
"	O
father	O
of	O
high	B-Application
level	I-Application
assembler	I-Application
"	O
.	O
</s>
<s>
The	O
High	B-Application
Level	I-Application
Assembler	I-Application
Toolkit	O
is	O
a	O
separately	O
priced	O
accompaniment	O
to	O
the	O
High	B-Application
Level	I-Application
Assembler	I-Application
.	O
</s>
