# foci

`foci` is a small Forth implementation that prioritizes performance and portability. This threaded Forth implementation uses CPU registers and native execution to maximize efficiency.

Register usage is the only platform-specific requirement; otherwise, `foci` is written in 100% portable C. There is active support for x86\_64, ARM Cortex-M, and MSP430 architectures.

`foci` compiles to a binary object that can easily be linked into another application. Code size is generally a few kilobytes, while RAM usage is primarily set by the size of `foci`'s two stacks and dictionary.

## Available words

```
dup drop swap rot -rot over tuck @ !  c@ c!  + +!  - * / mod and or xor _c [ ]
, cell cell+ cells _d base here allot latest negate invert 1- 1+ aligned align
: ; literal _b _bz if then else \' [\'] execute decimal hex .  emit
```

## Build instructions

Run `make` with a supported architecture target:

* `make x86-64`: x86\_64 processors (i386 is *not* supported)
* `make arm-cm4`: ARM Cortex-M4 microcontrollers
* `make msp430`: TI MSP430 microcontrollers