Multi-Tech Systems MT128ZLX-NT - Manual (Page 104)

MultiMobile MT128ZLX User Guide 4: Windows NT Driver Procedures
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13. At the Insert Disk screen, enter D:\nt40, where “D” is the CD-ROM drive letter.
Click OK.
14. The Select OEM Option screen appears.
Click OK.
15. A progress screen will appear while files are being copied.