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Int 2F Fn 4A00 CU - DOS 5+ - Floppy-disk Logical Drive Change Notificati [D]
AX = 4A00h
CX = 0000h
DH = new drive number
DL = current drive number
Return: CX = FFFFh to skip "Insert diskette for drive X:" message
Note: called by MS-DOS 5.0+ IO.SYS just before displaying the message
"Insert diskette for drive X:" on single-floppy systems
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