Microcontroller Forth cross compiler

Forth code running on an ATmega328P device blinking a few LEDs.  A simple ISP programmer is attached for in circuit programming.

There haven't been much progress lately.  The basics are there, but more features and polish are needed.

I hvae been busy working with the PDP-10 Incompatible Timesharing System:

http://github.com/PDP-10/its

There's now a very brief user manual: 

https://github.com/larsbrinkhoff/xForth/blob/master/doc/manual.md

I've had two people inquiring about using the cross compiler within a week.  I guess it's about time I made a proper user interface, and start writing a manual.

Almost done testing on hardware.  These devices can display a blinking LED:

• ATtiny13A / Cheepit Sparrow
• ATtiny85 / Adafrut Trinket
• Cortex-M0+ STM32L011 / STM Nucleo-32
• MSP430F2012, MSP430G2452, MSP430G2553 / TI Launchpad
• PIC16F1619 / Microchip Curiosity
• STM8S103F3P6 / Noname breakout board

I haven't been able to program my SiLabs 8051 using a ToolStick board.  If someone can suggest another 8051 which is easy to use, I'm all ears.

Added support for Cortex-M devices using the Thumb instruction set.

The compiler is tested on simulators for all targets, but I'd like to be able to test on real hardware.  This is the status so far:

• 8051: no hardware.
• AVR: tested on ATtiny85, soon ATtiny13.
• MSP430: I have asked Ken Boak for a ChipStick board.
• PIC: no hardware.
• STM8: @Thomas has offered to send a board.

I'd appreciate advice on which hardware to use for testing.  It should be easy to program, and there should be a LED or something to indicate a succesful test.

Done with 8051, almost done with PDP-8.

Started with 8051.

Added 6502, more for fun than actual utility.