This is the MCode interpreter for the ATmega162 platform (with 64KB of external static RAM). Thanks to the efficient design of the AVR core, typical Modula-2 bytecode can be run at approximately the same speed as a 100 MHz Z80.
Caveats:
- It has no Z80 emulation in it, so it can only run Modula-2 systems that are entirely compiled into MCode (Modula-2 bytecode, see my Turbo Modula-2 Reloaded repository for an example of such a system).
- LONGREAL support is missing (double precision floats) for now. I might add it in the future, it wasn't needed to get a fully functional system. REAL support (simple precision floats) is in, using the float library of the AVR LibC.
New version without overlays
The version in the No overlays branch has some modified opcodes and some new opcodes to better support the Oberon system. It is also simplified in the way that the old overlay system is not implemented any more, so it won't run the Modula-2 system nor the Modula-2 compiler.