Original Apollo 11 Guidance Computer (AGC) source code
PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
an object-oriented language with late binding
a self-contained development environment for embedded systems.
Assembles M6800 and 6801 assembly language source code. (and Forth)
It animates some Lissajous figures. It is Boot-able.
Your language to speak with all.
A C Compiler/Editor for Retro 6809 Machines (Colour Computer/Dragon)
Object-oriented RAD framework for Turbo Pascal 7.0
Android on PXA270