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Modelcalls, like syscalls, but instead of calling into the OS, we call into the model.
A modelcall is like a syscall, but it calls into the model asking it to do something. Model calls are done by calling the x86-out instruction. On a real processor this would write to the IO bus, but our processor doesn't support that.
At the moment, one model call is supported. Writing any byte to
port 1 results in printing out the null terminated string of one byte
characters pointed to by