https://github.com/M4Duke/m4rom<br />
It's compiled (assembled) with sdasz80 (part of SDCC package).<br />
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Telnet client example, source code (requires beta 1.0.9+ firmware):<br />
https://github.com/M4Duke/telnet<br />
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CPC xfer, pc commandline tool to transfer files back and forth to M4 board:<br />