<s>
BASIC	B-Language
A+	I-Language
was	O
developed	O
by	O
Optimized	B-Operating_System
Systems	I-Operating_System
Software	I-Operating_System
of	O
Cupertino	O
,	O
California	O
,	O
United	O
States	O
,	O
to	O
provide	O
the	O
Atari	B-Device
8-bit	I-Device
family	I-Device
with	O
an	O
extended	O
BASIC	B-Language
compatible	O
with	O
the	O
simpler	O
ROM-based	O
Atari	B-Language
BASIC	I-Language
.	O
</s>
<s>
This	O
interpreter	B-Language
was	O
developed	O
by	O
the	O
same	O
team	O
that	O
developed	O
Atari	B-Language
BASIC	I-Language
.	O
</s>
<s>
While	O
Atari	B-Language
BASIC	I-Language
came	O
on	O
an	O
8	O
KB	O
ROM	B-Device
cartridge	O
,	O
BASIC	B-Language
A+	I-Language
was	O
delivered	O
on	O
floppy	B-Device
disk	I-Device
and	O
uses	O
15	O
KB	O
of	O
the	O
computer	O
's	O
RAM	O
,	O
leaving	O
23	O
KB	O
available	O
for	O
user	O
programs	O
in	O
a	O
48	O
KB	O
Atari	B-Device
800	I-Device
.	O
</s>
<s>
Being	O
an	O
extension	O
of	O
Atari	B-Language
BASIC	I-Language
,	O
BASIC	B-Language
A+	I-Language
came	O
with	O
a	O
supplement	O
to	O
the	O
former	O
's	O
reference	O
manual	O
as	O
its	O
documentation	O
.	O
</s>
<s>
In	O
addition	O
to	O
being	O
faster	O
than	O
its	O
ROM-bound	O
counterpart	O
,	O
BASIC	B-Language
A+	I-Language
provides	O
extra	O
commands	O
for	O
DOS	O
operations	O
,	O
player/missile	O
graphics	O
,	O
and	O
debugging	O
.	O
</s>
<s>
BASIC	B-Language
A+	I-Language
was	O
followed	O
by	O
the	O
cartridge-based	O
BASIC	B-Language
XL	O
,	O
and	O
then	O
BASIC	B-Language
XE	O
.	O
</s>
