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4tH is a Forth compiler with a little difference. Instead of the standard Forth engine it features a conventional compiler. 4tH is a very small compiler that can create bytecode, C-embeddable bytecode, standalone executables, but also works fine as a scripting language. It supports about 95% of the ANS Forth CORE wordset and features conditional compilation, pipes, files, assertions, forward declarations, enumerations, structures, suspended execution, recursion, include files, etc. It comes with an RPN calculator, BASIC interpreter, line editor, preprocessor, compiler, decompiler, C-source generator, a virtual machine, and a multitasking environment.

See Wiki for usage and more details. Originally, xplgraph.scr library for DXForth was written to work on DOS systems only enabling point-and-plot graphics on VGA-compatible graphics devices. DXForth port to the 8-bit CP/M operating system lacked similar capability. The aim of this project is to provide an replacement of the original xplgraph.scr library, exposing roughly the same API, enabling graphics in DXForth running under CP/M. This library is written using DXForth's inline assembly...