PortMaster 3 V.90 Now Available ComOS with V.90 modem protocol support is now available for PortMaster 3 customers worldwide. Supported by ComOS 3.8 or later, this code provides widespread client modem interoperability, including backward compatibility with Lucent Technologies K56flex modems. PortMaster 3 customers can download the latest version of ComOS and release notes from ftp.livingston.com/pub/le/upgrades/.