Ricoh UC5 Operator's Manual page 22

After defining the port to be used Windows NT displays a dialogue box listing
standard drivers supplied on the Windows NT operating system CD. The UC5
drivers must be installed from the supplied UC5 CD ROM. Click "have disk" at
this dialogue box.
In the dialogue box shown enter YOUR computers CD drive letter. For example,
if your computer CD ROM is drive letter X then enter "X:\winnt4" and click "OK".
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