<s>
BASIC	B-Language
toolkits	I-Language
(	O
aka	O
BASIC	B-Language
extensions	I-Language
)	O
were	O
a	O
common	O
type	O
of	O
program	O
for	O
1980s	O
8-bit	O
home	O
computers	O
.	O
</s>
<s>
Generally	O
third-party	O
extensions	O
,	O
they	O
added	O
additional	O
features	O
to	O
a	O
computer	O
's	O
built-in	O
BASIC	B-Language
interpreter	B-Application
.	O
</s>
<s>
Toolkits	O
ran	O
as	O
extensions	O
to	O
the	O
BASIC	B-Language
interpreter	B-Application
supplied	O
with	O
the	O
machine	O
.	O
</s>
<s>
At	O
the	O
time	O
,	O
such	O
interpreters	B-Application
almost	O
always	O
came	O
programmed	O
into	O
the	O
ROM	B-Device
of	O
the	O
computer	O
,	O
making	O
it	O
impossible	O
to	O
modify	O
or	O
patch	O
the	O
code	B-Application
.	O
</s>
<s>
As	O
the	O
original	O
language	O
was	O
held	O
in	O
immutable	O
ROM	B-Device
,	O
it	O
generally	O
was	O
difficult	O
for	O
a	O
toolkit	O
to	O
directly	O
extend	O
the	O
language	O
,	O
except	O
by	O
adding	O
new	O
keywords	O
to	O
perform	O
functions	O
not	O
implemented	O
by	O
the	O
original	O
interpreter	B-Application
.	O
</s>
<s>
Typical	O
toolkit	O
functionality	O
included	O
editing	O
extensions	O
,	O
such	O
as	O
commands	O
to	O
renumber	O
a	O
program	O
,	O
perform	O
block	O
line	O
deletions	O
and	O
so	O
on	O
,	O
facilities	O
to	O
make	O
structured	B-Language
programming	I-Language
possible	O
,	O
and	O
additional	O
keywords	O
to	O
perform	O
new	O
functions	O
.	O
</s>
<s>
This	O
would	O
have	O
otherwise	O
been	O
achieved	O
by	O
arcane	O
usage	O
of	O
PEEK	B-Language
and	I-Language
POKE	I-Language
commands	O
and	O
machine	B-Language
language	I-Language
routines	O
.	O
</s>
