It is script compatible with the original version. It has an extra option '-finemessage' which gives the plain font text below the main message. This extra option is consistent with the native behaviour. This package includes a realtime task manager, a hardware channel mapping facility, a shared data region for all interpreters and tasks, and a set of numerical tools for matrix manipulation. These tools are available in binary form for the macintosh, windows, and linux.
Source is available for other platforms.
One of the key features macintosh developers may be interested in is the support of serial ports for that platform. For those of you who don't currently have and don't want to purchase the Metrowerks compiler, its possible to build MacTcl extensions using the freely available MPW development environment from Apple. This page has a sample extension and complete instructions. An additional device is available which provides a USB to ADB converter. Between agreeable applications, AppleEvents allow communication of anything that can be passed as an argument to a command-line application and much more.