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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
Category: DOS Kernel - Int 2Fh - D
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