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AH = 04h DL = character to write
Notes: Keyboard checked for ^C/^Break, and INT 23 executed if detected. STDAUX is usually the first serial port. If STDAUX is busy, this function will wait until it becomes free
See Also: AH=03h - INT 14/AH=01h - INT E0/CL=04h
Category: DOS Kernel - Int 21h - D
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