Description:

4tH is basic framework for creating application specific scripting
languages. It is a library of functions centered around a virtual
machine, which guarantees high performance, ease of use and low
overhead. But in the meanwhile 4tH has acquired a reputation as an
educational tool. Its simplicity makes it perfectly suited to learn
Forth, from which it has been derived.
This package is an attempt to suit both audiences. It contains
instructions how to modify the package in order to fit your own
requirements. 4tH in its current form is a calculator for simple
teletype applications.