<s>
conio.h	B-Language
is	O
a	O
C	B-Language
header	O
file	O
used	O
mostly	O
by	O
MS-DOS	B-Application
compilers	O
to	O
provide	O
console	B-Language
input/output	I-Language
.	O
</s>
<s>
It	O
is	O
not	O
part	O
of	O
the	B-Language
C	I-Language
standard	I-Language
library	I-Language
or	O
ISO	O
C	B-Language
,	O
nor	O
is	O
it	O
defined	O
by	O
POSIX	O
.	O
</s>
<s>
Most	O
C	B-Language
compilers	O
that	O
target	O
DOS	B-Device
,	O
Windows	O
3.x	O
,	O
Phar	O
Lap	O
,	O
DOSX	O
,	O
OS/2	B-Application
,	O
or	O
Win32	B-Library
have	O
this	O
header	O
and	O
supply	O
the	O
associated	O
library	O
functions	O
in	O
the	O
default	O
C	B-Language
library	I-Language
.	O
</s>
<s>
Most	O
C	B-Language
compilers	O
that	O
target	O
UNIX	B-Application
and	O
Linux	B-Application
do	O
not	O
have	O
this	O
header	O
and	O
do	O
not	O
supply	O
the	O
library	O
functions	O
.	O
</s>
<s>
Some	O
embedded	O
systems	O
or	O
cc65	B-Application
use	O
a	O
conio-compatible	O
library	O
.	O
</s>
<s>
As	O
originally	O
implemented	O
in	O
Lattice	B-Device
C	I-Device
,	O
the	O
various	O
functions	O
mapped	O
directly	O
to	O
the	O
first	O
few	O
DOS	B-Device
INT	B-Application
21H	I-Application
functions	O
.	O
</s>
<s>
The	O
library	O
supplied	O
with	O
Borland	O
's	O
Turbo	B-Application
C	I-Application
did	O
not	O
use	O
the	O
DOS	B-Application
API	I-Application
but	O
instead	O
accessed	O
video	O
RAM	O
directly	O
for	O
output	O
and	O
used	O
BIOS	B-Device
interrupt	I-Device
calls	I-Device
.	O
</s>
<s>
This	O
library	O
also	O
has	O
additional	O
functions	O
inspired	O
from	O
the	O
successful	O
Turbo	B-Application
Pascal	I-Application
one	O
.	O
</s>
<s>
Compilers	O
that	O
target	O
non-DOS	O
operating	O
systems	O
,	O
such	O
as	O
Linux	B-Application
or	O
OS/2	B-Application
,	O
provide	O
similar	O
solutions	O
;	O
the	O
unix-related	O
curses	B-Device
library	O
is	O
very	O
common	O
here	O
.	O
</s>
<s>
The	O
version	O
of	O
done	O
by	O
DJ	B-Application
Delorie	I-Application
for	O
the	O
GO32	O
extender	O
is	O
particularly	O
extensive	O
.	O
</s>
