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INT 7A - IBM Personal Communications/3270 - INSTALLATION CHECK
        AX = FDCBh
Return: DX:AX -> PCS/3270 signature block if loaded (see below)

Format of signature block:
Offset  Size    Description
 04h    WORD    PCS/3270 signature (5741h)
 06h    WORD    version (0501h = PCS/3270 v1.0)
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