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Basic Disk Operating System (BDOS) Functions
CONSOLE OUTPUT
ENTRY
CL: 02H
DL: ASCII
Character
RETURN
FUNCTION 2
CONSOLE OUTPUT
The Console Output function sends the ASCII character in DL to the logical
console. Tab characters expand in columns of eight characters. This function also
makes a check for start/stop scroll (CONTROL-S).
READER INPUT
ENTRY
RETURN
CL: 03H
FUNCTION 3
AL: ASCII Charactel
READER INPUT
The Reader input function reads the next character from the logical reader
(READER) into register AL. Control does not return to the calling program until a
character has been read.
PUNCH OUTPUT
ENTRY
CL: 04H
DL: ASCII
Character
RETURN
FUNCTION 4
PUNCH OUTPUT
The Punch Output function sends the ASCII character in register DL to the logical
·punch device (PUNCH).
4-5
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