testing and making changes to compile in TBX.
Implementing MRI in Add01.as in instr_exec unit (executes each instruction at a time) to test instr_decode (fetch and decode and sends to instruction execution unit).
PDP8 Assembly code trace file reader was using scanf, has been completely changed to use $readmemh().
Instruction decoding unit is work on progress.
Rest of the modules are getting more cleaning and testing.
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