3CXM756 and 3CCM756 PC Cards

  • Modem returns a "No Dialtone" error message.
  • Will my PC Card function properly outside of North America?
  • How to get a 756 modem to function in Linux 6.x.
  • New modem problems with Dial Up Networking.
  • PC Card trouble with Motorola Startac 7790 Phone.
  • PCMCIA modem and Gateway Solo 9100 running Windows NT 4.0.
  • Modem problems with NEC 6000 series laptop running Windows NT 4.0.
  • Technical Bulletins

  • Configure Your PC Card With Modem Initialization Strings
  • Connect Your Compatible Cellular Cable
  • Configure Windows 9x For Internet Services
  • Acquire Firmware Upgrade From Our Web Site
  • Verify Your PC Card Controller Is Configured For Windows 9x
  • Determine Product and Firmware Revision
  • Configure Your System For PC Card Modems In Windows 9x

    Additional Support

    If the support information in this section doesn't help you solve your issue, you can contact a USR Help Desk Technician directly.

    Manuals and other Documents


    OS Compatibility


    2012 R2







    Vista 64


    XP 64




    98 SE

    98 FE





    Model 3cxm756 and 3ccm756 Drivers and Firmware
    Windows 95, 98 and NT 4.0 installation disks
    3cxm756.exe 908 KB 08-19-99
    Updated Linux 6.x CONFIG.OPTS file
    config.opts.txt1 KB07-17-00
    Firmware upgrade used for the Eric2 cable and PBX Direct Connect Cable
    tk206.exe665 KB04-10-00
    Apple Powerbook modem scripts for Megahertz V.90 modems. Includes scripts for cellular connections.
    v90scripts.sit 12 KB 03-08-00

    Cut the Cord and Go Cellular! Cellular Gateway Cellular Modems and Gateways make the M2M world go round. Learn all about Cellular

    Network TAPs Aggregation Tap Get your SPAN ports back and truly see into your network traffic. Start Tapping now!

    Share Telephone Lines Call Director Line Sharing Device Learn how you can save money by letting your modem, POS, fax and telephone all share one line. Learn more now!

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    Warranty Service Learn how to send your product in for warranty service.

    Electronic product documentation is provided as a courtesy to USRobotics customers. These are electronic versions of the original documentation. Some of the information contained within this documentation, including the support contact information, is subject to change.