I am making my first steps in lc3 assembly programming and I noticed that every time I try to store a negative value in memory, for example using "ST" instruction, there is some kind of error. In this memory location is stored "TRAP xFF" instead... Anybody know how can I get over it??
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You're getting that error because your variables are apart of the run-time code. It's usually best practice to put your variables at the end of your code after the HALT command.
The reason you were getting those errors is because when you were storing numbers into your variables the simulator thought they were commands. The trap command has an opcode of 1111 which also a negative number. When the simulator ran into your variable it couldn't figure out what type of TRAP command it was, thus the error. By preventing the simulator from running your variables you won't get that error.