In this repo you can find sources for programs that have been written for Titan
See the following link for an explanation of the ISA of the processor and assembly conventions.
There are a few assemblers for Titan but only my own assembler in scheme can really be trusted to be accurate and up to date.
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bootnecklad's assembler in scheme can be found here.
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fatcookies' wrote an assembler for both the desktop and android, they are available here.
One written in scheme by bootnecklad can be found here
One that has been half implemented (Written in C#) was written by Goost91.