<s>
Maestro	B-Application
I	I-Application
was	O
an	O
early	O
integrated	B-Application
development	I-Application
environment	I-Application
for	O
software	O
.	O
</s>
<s>
The	O
system	O
was	O
originally	O
called	O
"	O
Programm-Entwicklungs-Terminal-System	O
"	O
(	O
"	O
program	O
development	O
terminal	O
system	O
"	O
)	O
abbreviated	O
as	O
PET	O
;	O
it	O
was	O
renamed	O
after	O
Commodore	O
International	O
introduced	O
a	O
home	O
computer	O
called	O
the	O
Commodore	B-Device
PET	I-Device
in	O
1977	O
.	O
</s>
<s>
The	O
first	O
USA	O
installations	O
were	O
at	O
Boeing	O
in	O
1979	O
with	O
eight	O
Maestro	B-Application
I	I-Application
systems	O
and	O
Bank	O
of	O
America	O
with	O
24	O
system	O
and	O
576	O
developer	O
terminals	O
.	O
</s>
<s>
One	O
of	O
the	O
last	O
Maestro	B-Application
I	I-Application
systems	O
is	O
at	O
the	O
Museum	O
of	O
Information	O
Technology	O
at	O
Arlington	O
.	O
</s>
<s>
The	O
introduction	O
of	O
the	O
IBM	B-Operating_System
3270	I-Operating_System
terminals	O
together	O
with	O
IBM	O
’s	O
ISPF	B-Operating_System
(	O
Interactive	B-Operating_System
System	I-Operating_System
Productivity	I-Operating_System
Facility	I-Operating_System
)	O
constituted	O
a	O
real	O
improvement	O
.	O
</s>
<s>
The	O
text	O
editor	O
that	O
was	O
integrated	O
in	O
ISPF	B-Operating_System
allowed	O
source	O
code	O
for	O
programs	O
to	O
be	O
entered	O
in	O
real	O
time	O
.	O
</s>
<s>
ISPF	B-Operating_System
required	O
entering	O
code	O
a	O
page	O
at	O
a	O
time	O
,	O
decreasing	O
the	O
immediacy	O
of	O
feedback	O
;	O
Maestro	O
aimed	O
to	O
solve	O
this	O
by	O
feeding	O
each	O
keystroke	O
directly	O
to	O
the	O
CPU	O
.	O
</s>
