Basic
Disk
Operating System (BDOS) Functions
4-6
LIST
OUTPUT
ENTRY
CL:
05H
DL: ASCII
Character
RETURN
FUNCTION
5
LIST
OUTPUT
The
List
Output
function sends the ASCII character in register
DL
to the logical list
device (LIST).
DIRECT
CONSOLE
I/O
ENTRY
CL: 06H
DL: OFFH (input)
or
OFEH (status)
or
char
(output)
FUNCTION
6
DIRECT
CONSOLE
I/O
RETURN
AL:
char
or
status
or
(no
value)
The
Direct Console
I/O
function performs one
of
three functions, depending
on
the
value in register
DL.
It
reads a character from the console, writes a
character
to
the
console,
or
returns the console status.
Direct Console
1/0
is
supported
under
CP/M-86
for those specialized applications
where
unadorned
console
input
and
output
are required. Use
of
this function
should, in general, be avoided since it bypasses all
of
CP/M-86's
normal
control
character
functions (e.g., CONTROL-S
and
CONTROL-P).
Programs
which
perform
direct
I/O
through
the BIOS
under
previous releases
of
CP/M-80,
however,
should
be changed
to
use Direct Console
I/O
under
the BDOS so
that
they can be fully supported
under
future releases
of
CP/M.
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