<s>
MAC/65	B-Application
is	O
a	O
6502	B-General_Concept
assembler	B-Language
written	O
by	O
Stephen	O
D	O
.	O
Lawrow	O
for	O
the	O
Atari	B-Device
8-bit	I-Device
family	I-Device
of	O
home	O
computers	O
.	O
</s>
<s>
MAC/65	B-Application
was	O
first	O
released	O
on	O
disk	O
by	O
Optimized	B-Operating_System
Systems	I-Operating_System
Software	I-Operating_System
in	O
1982	O
,	O
with	O
the	O
program	O
requiring	O
16	O
KB	O
RAM	O
.	O
</s>
<s>
A	O
bank	B-General_Concept
switched	I-General_Concept
"	O
SuperCartridge	O
"	O
from	O
OSS	O
followed	O
in	O
January	O
1984	O
for	O
US$99	O
,	O
occupying	O
only	O
8	O
KB	O
.	O
</s>
<s>
MAC/65	B-Application
is	O
structured	O
similarly	O
to	O
the	O
Atari	B-Application
Assembler	I-Application
Editor	I-Application
cartridge	O
,	O
combining	O
a	O
line	O
editor	O
,	O
assembler	B-Language
,	O
and	O
debugger	O
into	O
a	O
single	O
package	O
.	O
</s>
<s>
Its	O
reputation	O
was	O
based	O
on	O
being	O
much	O
faster	O
than	O
either	O
the	O
Assembler	B-Language
Editor	O
or	O
the	O
standalone	O
Atari	O
Macro	O
Assembler	B-Language
.	O
</s>
<s>
Brian	O
Moriarty	O
of	O
Infocom	O
wrote	O
,	O
"	O
No	O
assembler	B-Language
[	O
at	O
the	O
time ]	O
on	O
the	O
C64	O
even	O
comes	O
CLOSE	O
to	O
MAC/65	B-Application
.	O
</s>
<s>
It	O
was	O
used	O
to	O
write	O
numerous	O
commercial	O
games	O
and	O
applications	O
,	O
and	O
the	O
majority	O
of	O
assembly	B-Language
language	I-Language
listings	O
in	O
ANALOG	O
Computing	O
were	O
written	O
with	O
MAC/65	B-Application
.	O
</s>
<s>
According	O
to	O
Lawrow	O
,	O
MAC/65	B-Application
was	O
used	O
to	O
compile	O
not	O
only	O
itself	O
,	O
but	O
BASIC	O
XL	O
and	O
BASIC	O
XE	O
.	O
</s>
<s>
Like	O
Atari	B-Language
BASIC	I-Language
,	O
source	O
code	O
in	O
MAC/65	B-Application
uses	O
line	O
numbers	O
and	O
is	O
tokenized	O
as	O
it	O
is	O
entered	O
.	O
</s>
<s>
The	O
main	O
advantage	O
to	O
this	O
approach	O
,	O
however	O
,	O
is	O
that	O
"	O
compiling	O
"	O
the	O
program	O
is	O
a	O
simplified	O
task	O
of	O
copying	O
out	O
the	O
tokens	O
at	O
the	O
correct	O
starting	O
address	O
,	O
as	O
the	O
tokens	O
are	O
the	O
ultimate	O
instruction	B-Language
opcodes	I-Language
.	O
</s>
<s>
Unlike	O
the	O
Atari	B-Application
Assembler	I-Application
Editor	I-Application
,	O
MAC/65	B-Application
provides	O
macro	O
processing	O
and	O
conditional	O
assembly	O
.	O
</s>
<s>
The	O
cartridge	O
version	O
added	O
65C02	B-General_Concept
opcode	B-Language
support	O
as	O
well	O
as	O
a	O
condensed	O
version	O
of	O
Dunion	O
's	O
Debugging	O
Tool	O
(	O
DDT	O
)	O
by	O
Jim	O
Dunion	O
,	O
the	O
full	O
version	O
of	O
which	O
was	O
originally	O
sold	O
through	O
the	O
Atari	B-Application
Program	I-Application
Exchange	I-Application
.	O
</s>
<s>
DDT	O
replaced	O
the	O
BUG/65	O
debugger	O
which	O
shipped	O
with	O
the	O
disk	O
version	O
of	O
MAC/65	B-Application
.	O
</s>
<s>
The	O
ToolKit	O
was	O
a	O
floppy	O
diskette	O
filled	O
with	O
source	O
code	O
and	O
examples	O
for	O
use	O
with	O
the	O
MAC/65	B-Application
assembler	B-Language
.	O
</s>
<s>
The	O
ToolKit	O
required	O
an	O
Atari	B-Device
8-bit	I-Device
with	O
48K	O
of	O
memory	O
,	O
a	O
disk	O
drive	O
and	O
the	O
MAC/65	B-Application
cartridge	O
.	O
</s>
<s>
using	O
the	O
MAC/65	B-Application
ToolKit	O
:	O
</s>
<s>
MAC/65	B-Application
along	O
with	O
other	O
OSS	O
products	O
became	O
part	O
of	O
ICD	O
's	O
catalog	O
of	O
Atari	O
products	O
in	O
January	O
1988	O
.	O
</s>
<s>
In	O
1994	O
,	O
Fine	O
Tooned	O
Engineering	O
obtained	O
limited	O
rights	O
to	O
ICD	O
's	O
8-bit	O
products	O
,	O
including	O
MAC/65	B-Application
.	O
</s>
<s>
The	O
open	B-License
source	I-License
ATasm	O
project	O
was	O
written	O
as	O
a	O
MAC/65	B-Application
-compatible	O
cross	B-Language
assembler	I-Language
.	O
</s>
