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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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