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Int 21 Fn 3F - DOS 2+ - "read" - Read From File Or Device [D]
AH = 3Fh
BX = file handle
CX = number of bytes to read
DS:DX -> buffer for data
Return: CF clear if successful
AX = number of bytes actually read (0 if at EOF before call)
CF set on error
AX = error code (05h,06h) (see AH=59h)
Notes: data is read beginning at current file position, and the file position
is updated after a successful read
the returned AX may be smaller than the request in CX if a partial
read occurred
if reading from CON, read stops at first CR
under the FlashTek X-32 DOS extender, the pointer is in DS:EDX
See Also: AH=27h,AH=40h,AH=93h,INT 2F/AX=1108h,INT 2F/AX=1229h
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