KEYBOARD WEDGE INSTALLATION (CONTINUED)
If the keyboard port of the host system cannot supply enough current, the
use of an external power supply with the MS6220 Keyboard Wedge will be
necessary. Powering the MS6220 directly from the computer keyboard
connector could interfere with the operation of the scanner or the computer.
Not all computers supply the same current through the keyboard port, so a
scanner may work on one computer and not another (see caution statement
on page 5).