<s>
The	O
IBM	B-Device
System/370	I-Device
Model	I-Device
115	I-Device
was	O
announced	O
March	O
13	O
,	O
1973	O
,	O
at	O
that	O
time	O
the	O
low-end	O
model	O
of	O
the	O
System/370	B-Device
line	O
.	O
</s>
<s>
It	O
was	O
promoted	O
as	O
"	O
an	O
ideal	O
System/370	B-Device
entry	O
system	O
for	O
users	O
of	O
IBM	O
's	O
System/3	B-Device
,	O
1130	B-Device
computing	O
system	O
and	O
System/360	B-Application
Models	O
20	B-Device
,	O
22	B-Device
and	O
25.	O
"	O
</s>
<s>
The	O
CPU	O
had	O
a	O
CPU	O
and	O
memory	O
cycle	B-General_Concept
time	I-General_Concept
of	O
480ns	O
.	O
</s>
<s>
Main	O
memory	O
was	O
composed	O
of	O
MOSFET	B-Architecture
monolithic	O
integrated	O
circuits	O
.	O
</s>
<s>
The	O
system	O
had	O
a	O
CRT	B-Device
operator	B-Device
console	I-Device
.	O
</s>
<s>
Standard	O
features	O
of	O
the	O
Model	O
115	O
were	O
the	O
System/370	B-Device
standard	O
and	O
commercial	O
(	O
including	O
decimal	B-Device
arithmetic	O
)	O
instruction	O
sets	O
,	O
and	O
a	O
"	O
direct	O
disk	O
attachment	O
"	O
for	O
IBM	B-Device
3340	I-Device
disk	O
drives	O
.	O
</s>
<s>
Optional	O
features	O
included	O
System/370	B-Device
floating	B-Algorithm
point	I-Algorithm
instructions	O
,	O
System/360	B-Application
Model	O
20	B-Device
compatibility	O
,	O
IBM	B-Device
1401	I-Device
,	O
1440	B-Device
and	O
1460	B-Device
compatibility	O
,	O
and	O
various	O
input/output	O
attachment	O
options	O
(	O
see	O
below	O
)	O
.	O
</s>
<s>
The	O
standard	O
direct	O
disk	O
attachment	O
could	O
attach	O
two	O
to	O
four	O
IBM	B-Device
3340	I-Device
disk	O
drives	O
for	O
a	O
total	O
of	O
up	O
to	O
280	O
million	O
bytes	O
.	O
</s>
<s>
A	O
"	O
magnetic	O
tape	O
adapter	O
"	O
supported	O
an	O
IBM	O
3210/3211	O
controller	O
and	O
tape	B-Architecture
drives	I-Architecture
.	O
</s>
<s>
The	O
operating	B-General_Concept
system	I-General_Concept
for	O
the	O
Model	O
115	O
was	O
either	O
DOS/360	O
or	O
DOS/VS	B-Application
.	O
</s>
<s>
DOS/VS	B-Application
supported	O
a	O
single	O
address	B-General_Concept
space	I-General_Concept
of	O
16,777,216	O
(	O
16MB	O
)	O
of	O
virtual	O
storage	O
.	O
</s>
<s>
This	O
address	B-General_Concept
space	I-General_Concept
could	O
be	O
divided	O
up	O
into	O
up	O
to	O
five	O
partitions	O
.	O
</s>
<s>
The	O
system	O
could	O
run	O
all	O
software	O
written	O
for	O
System/370	B-Device
(	O
as	O
long	O
as	O
memory	O
and	O
device	O
requirements	O
were	O
met	O
)	O
Language	O
processors	O
included	O
Assembler	B-Language
,	O
RPG	B-Language
II	I-Language
,	O
COBOL	B-Application
,	O
FORTRAN	B-Application
and	O
PL/I	B-Language
.	O
</s>
