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Int 21 Fn 69FF U - Cubit V4.00 - Get Cubit Int 21 Handler [d]
AX = 69FFh
DX = 0000h
BX = CB00h (magic value)
Return: ES:BX -> CUBITR.EXE handler for INT 21
Note: the installation check consists of testing that the first eight bytes
at the returned interrupt handler are EBh 07h "CUBITR" (a short
jump around the signature followed by the signature); the byte
following the signature (i.e. ES:[BX+8]) indicates whether CUBITR
is active (01h) or disabled (00h)
See Also: AX=69FFh/DX=CFBFh
Index: installation check;CUBIT
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