Mustek KB4000 - Manual (Page 6)

You may find two screw holes on back of the right side of the main unit
of Jiva series or TM4000 series or the like. Just align the upgrade unit on the
right edge of the main unit after removing these 2 screws then replace them with
the attached 2 screws and fasten them with washer as indicated in the picture
below.
Back of Jiva Series
The Upgrade Kit
Upgrade Unit Screw Hole
CABLE CONNECTION
Connection To Host
KB4000 KP100 SD100
PS/2 KB Connector Special MSR Connector USB Connector
Please refer to the pictures above. The USB connector could be absent
from the product if the product is purchased without the smart card reader and
the finger print scanner or if it is SD100 with only the special type of MSR
(instead of the USB interface MSR) or the iButton receptor. The MSR connector
KB4000 Series User’s Manual 2 - 2