The sources for the DE0 nano Quartus project can be downloaded from here.
The Quartus project should compile with 13.1 or above. The rom0 memory is set to load "both.hex" which is BASIC2 and a slightly hacked version of OS1.2 (the main difference is to skip checking interrupts for the user via).
The assembler sources are in the /software directory and can be compiled using the cmp.sh and cmpOS.sh scripts. You'll need cc65 version V2.14.0 or later
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