<s>
The	O
IBM	B-Device
System/34	I-Device
was	O
an	O
IBM	B-Device
midrange	I-Device
computer	I-Device
introduced	O
in	O
1977	O
.	O
</s>
<s>
It	O
was	O
a	O
multi-user	O
,	O
multi-tasking	O
successor	O
to	O
the	O
single-user	O
System/32	B-Device
.	O
</s>
<s>
It	O
included	O
two	O
processors	O
,	O
one	O
based	O
on	O
the	O
System/32	B-Device
and	O
the	O
second	O
based	O
on	O
the	O
System/3	B-Device
.	O
</s>
<s>
Like	O
the	O
System/32	B-Device
and	O
the	O
System/3	B-Device
,	O
the	O
System/34	B-Device
was	O
primarily	O
programmed	O
in	O
the	O
RPG	B-Language
II	I-Language
language	O
.	O
</s>
<s>
The	O
IBM	B-Device
5250	I-Device
series	O
of	O
terminals	B-General_Concept
were	O
the	O
primary	O
interface	O
to	O
the	O
System/34	B-Device
.	O
</s>
<s>
The	O
MSP	O
was	O
the	O
workhorse	O
,	O
based	O
on	O
System/3	B-Device
architecture	O
;	O
it	O
performed	O
the	O
instructions	O
in	O
the	O
computer	O
programs	O
.	O
</s>
<s>
The	O
CSP	O
was	O
the	O
governor	O
,	O
a	O
different	O
processor	O
with	O
different	O
RISC-like	O
instruction	O
set	O
,	O
based	O
on	O
System/32	B-Device
architecture	O
;	O
it	O
performed	O
system	O
functions	O
in	O
the	O
background	O
.	O
</s>
<s>
The	O
CSP	O
also	O
executed	O
the	O
optional	O
Scientific	O
Macroinstructions	O
,	O
which	O
were	O
a	O
set	O
of	O
emulated	O
floating	O
point	O
operations	O
used	O
by	O
the	O
System/34	B-Device
Fortran	B-Application
compiler	O
and	O
optionally	O
in	O
assembly	O
code	O
.	O
</s>
<s>
The	O
clock	O
speed	O
of	O
the	O
CPUs	O
inside	O
a	O
System/34	B-Device
was	O
fixed	O
at	O
1MHz	O
for	O
the	O
MSP	O
and	O
4MHz	O
for	O
the	O
CSP	O
.	O
</s>
<s>
Disk	O
space	O
on	O
the	O
System/34	B-Device
was	O
organized	O
by	O
blocks	B-General_Concept
of	O
2560	O
bytes	O
.	O
</s>
<s>
The	O
System/34	B-Device
supported	O
memory	B-Architecture
paging	I-Architecture
,	O
referring	O
to	O
as	O
swapping	O
.	O
</s>
<s>
The	O
System/34	B-Device
could	O
either	O
swap	O
out	O
entire	O
programs	O
,	O
or	O
individual	O
segments	O
of	O
a	O
program	O
in	O
order	O
to	O
free	O
up	O
memory	O
for	O
other	O
programs	O
to	O
run	O
.	O
</s>
<s>
The	O
System	B-Operating_System
Support	I-Operating_System
Program	I-Operating_System
(	O
SSP	O
)	O
was	O
the	O
only	O
operating	O
system	O
of	O
the	O
S/34	O
.	O
</s>
<s>
It	O
contained	O
support	O
for	O
multiprogramming	O
,	O
multiple	O
processors	O
,	O
36	O
devices	O
,	O
job	O
queues	O
,	O
printer	O
queues	O
,	O
security	O
,	O
indexed	B-Language
file	I-Language
support	O
.	O
</s>
<s>
The	O
Operational	B-Language
Control	I-Language
Language	I-Language
(	O
OCL	O
)	O
was	O
the	O
control	O
language	O
of	O
SSP	O
.	O
</s>
<s>
The	O
System/34	B-Device
'	O
s	O
initial	O
programming	O
languages	O
were	O
limited	O
to	O
RPG	B-Language
II	I-Language
and	O
Basic	B-Language
Assembler	O
when	O
introduced	O
in	O
1977	O
.	O
</s>
<s>
FORTRAN	B-Application
was	O
fully	O
available	O
six	O
months	O
after	O
the	O
34	O
's	O
introduction	O
,	O
and	O
COBOL	B-Application
was	O
available	O
as	O
a	O
PRPQ	O
.	O
</s>
<s>
BASIC	B-Language
was	O
introduced	O
later	O
.	O
</s>
<s>
The	O
IBM	B-Device
System/38	I-Device
was	O
intended	O
to	O
be	O
the	O
successor	O
of	O
the	O
System/34	B-Device
and	O
the	O
earlier	O
System/3x	O
systems	O
.	O
</s>
<s>
However	O
,	O
due	O
to	O
the	O
delays	O
in	O
the	O
development	O
of	O
the	O
System/38	B-Device
and	O
the	O
high	O
cost	O
of	O
the	O
hardware	O
once	O
complete	O
,	O
IBM	O
developed	O
the	O
simpler	O
and	O
cheaper	O
System/36	B-Device
platform	O
which	O
was	O
more	O
widely	O
adopted	O
than	O
the	O
System/38	B-Device
.	O
</s>
<s>
The	O
System/36	B-Device
was	O
an	O
evolution	O
of	O
the	O
System/34	B-Device
design	O
,	O
but	O
the	O
two	O
machines	O
were	O
not	O
object-code	O
compatible	O
.	O
</s>
<s>
Instead	O
,	O
the	O
System/36	B-Device
offered	O
source	O
code	O
compatibility	O
,	O
allowing	O
System/34	B-Device
applications	O
to	O
be	O
recompiled	O
on	O
a	O
System/36	B-Device
with	O
little	O
to	O
no	O
changes	O
.	O
</s>
<s>
Some	O
System/34	B-Device
hardware	O
was	O
incompatible	O
with	O
the	O
System/36	B-Device
.	O
</s>
<s>
A	O
third	O
party	O
product	O
from	O
California	O
Software	O
Products	O
,	O
Inc	O
.	O
named	O
BABY/34	O
allowed	O
System/34	B-Device
applications	O
to	O
be	O
ported	O
to	O
IBM	O
PC	O
compatible	O
hardware	O
running	O
MS-DOS	B-Application
.	O
</s>
