<s>
PL/8	B-Language
(	O
or	O
PL.8	O
)	O
,	O
is	O
a	O
dialect	O
of	O
PL/I	B-Language
developed	O
by	O
IBM	O
Research	O
in	O
the	O
1970s	O
by	O
compiler	O
group	O
,	O
under	O
Martin	O
Hopkins	O
,	O
within	O
a	O
major	O
research	O
program	O
that	O
led	O
to	O
the	O
IBM	O
RISC	B-Architecture
architecture	O
.	O
</s>
<s>
It	O
was	O
so-called	O
because	O
it	O
was	O
about	O
80%	O
of	O
PL/I	B-Language
.	O
</s>
<s>
Written	O
in	O
PL/I	B-Language
and	O
bootstrapped	O
via	O
the	O
PL/I	B-Language
Optimizing	O
compiler	O
,	O
it	O
was	O
an	O
alternative	O
to	O
PL/S	B-Language
for	O
system	O
programming	O
,	O
compiling	O
initially	O
to	O
an	O
intermediate	O
machine-independent	O
language	O
with	O
symbolic	O
registers	O
and	O
machine-like	O
operations	O
.	O
</s>
<s>
Back-ends	O
were	O
written	O
for	O
IBM	B-Device
801	I-Device
,	O
S/370	O
,	O
Motorola	B-Device
68000	I-Device
,	O
and	O
POWER/PowerPC	O
.	O
</s>
<s>
A	O
version	O
was	O
used	O
on	O
IBM	O
mainframes	O
as	O
a	O
development	O
tool	O
for	O
software	O
that	O
was	O
being	O
designed	O
for	O
the	O
IBM	B-Device
AS/400	I-Device
,	O
as	O
well	O
as	O
to	O
write	O
the	O
"	O
i370	O
"	O
internal	O
code	O
for	O
the	O
"	O
Capitol	O
"	O
chipset	O
used	O
in	O
the	O
IBM	B-Device
9377	I-Device
processor	I-Device
and	O
some	O
ES/9370	B-Device
models	O
and	O
the	O
millicode	B-General_Concept
for	O
S/390	O
and	O
z/Architecture	O
processors	O
.	O
</s>
