It's compiled (assembled) with sdasz80 (part of SDCC package).<br />
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TCP Echo client and server, Various source code (requires beta 1.0.9b8+ firmware)https://github.com/M4Duke/tcpecho<br /><br />Telnet client example, source code (requires beta 1.0.9+ firmware):examples for M4 board<br />https://github.com/M4Duke/telnetM4examples<br />
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CPC xfer, pc commandline tool to transfer files back and forth to M4 board:<br />