# OF816 OF816 is a [65C816](https://www.westerndesigncenter.com/wdc/w65c816s-chip.cfm) Forth implementation heavily inspired by [Open Firmware (IEEE 1275-1994)](https://www.openfirmware.info/Welcome_to_OpenBIOS). Note that OF816 is *not* an Open Firmware implementation (yet), but it has the potential (and groundwork has been done) for it to become one. ## Features Among its many features are: * Mostly platform-independent. OF816 can be ported easily to new systems. * Ports currently exist for the W65C816SXB, Neon816, and the Apple IIgs. * New ports require the implementation of a handful of routines. * Simple instantiation of one or more Forths in a system. * 32-bit cells. * ROM-able. * The core system does not write outside of data space, except to the 65816 direct page and stack. * System variables are provisioned at the start of data space when the sytem is initialized. * Optional [FCode](https://www.openfirmware.info/Forth/FCode) support (less Device Tree and Package functions). * [ANS Forth](http://lars.nocrew.org/dpans/dpans.htm) * Core, most of Core Ext, Exception, Search Order, and Search Order Ext word sets. * Smattering of words from other sets. * Good conformance test coverage. ## Goal The goal of OF816 is to help get 65C816-based projects off the ground in terms of development and testing. With a little effort it can be brought up on a new system and used to play around with new hardware. OF816 is not designed for speed. While reasonably performant, the primary goal was compatibility with 32-bit Open Firmware's core word set, cell size, and FCode. This allows the possibility of re-using existing Forth source and FCode to develop hardware drivers, and potentially developing OF816 into a full Open Firmware implementation. ## Resources In addition to the links above, please see the ``LICENSE`` file, ``docs\``, and the directories under ``platforms\``. OF816 is licensed under a two-clause BSD license.