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AX = 69FFh DX = CFBFh CX = EFCFh BX = CB00h (magic value)
Return:
ES:BX -> CUBITR.EXE handler for INT 21 CX = status 2020h successful 2222h failed
Note: If DX is neither 0000h nor CFBFh on entry, some other code is executed
See Also: AX=69FFh/DX=0000h
Category: Disk I/O Enhancements - Int 21h - C
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