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Int E0 - Dr Multiuser DOS - "a_read" - Read Character From Aux Device [O]
CL = 03h
Return: AL = ASCII character
Notes: A_READ reads the next 8-bit character from the logical auxilliary
input device (AUXn:); control is not returned to the calling
process until a character has been read.
if another process owns AUX, this call blocks until the device becomes
available
See Also: INT 21/AH=03h,INT E0/CL=04h,INT E0/CL=07h,INT E0/CL=A5h,INT E0/CL=ACh
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