DOS Fn 06H: Console I/O
Compatibility: 1.0+
Expects: AH 06H
DL 0 to 0feH character to send to the Standard Output
0ffH request for input from the Standard Input
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Returns: ZF clear (NZ) if character is ready ══╦═► on input requests
AL character read, if ZF is clear ════╝ (when DL=0ffH)
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Info: If DL is 0ffH, this performs a "no wait" console input, returning
the Zero Flag (ZF) set (ZR) if there is no character ready. If a
character is ready, returns ZF cleared (NZ) with the character
that was read in AL.
If DL is anything but 0ffH, DL is sent to the Standard Output.
Notes: ■ Does not check for Ctrl-Break.
■ Call twice for Extended ASCII.
See Also: Character I/O Functions
DOS Functions
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