The Apple Coax/Twinax card is compatible with System 7, and the installer for System 7 updates the A/ROSE software needed to run that card. The Coax/Twinax card can be used with System 7 and compatible third-party products.
MacDFT is not compatible with System 7. Users who require MacDFT functionality should not upgrade to System 7 until the upgrade to MacDFT is available.