Hello, I have a very small debugger for the GT40 called URUG, or micro RUG. It has two troublesome instructions: CMP R3,(R3)+ and equivalent with R4. I suppose SIMH will run it fine even though there's a hazard?
The PALX assembler complains about this, so I'm considering chaning the code. As far as I can see, the instructions are used to add 2 to a register. It's shorter than an ADD R3,#2, which is important because there's not a lot of memory on this machine. Would there be any possible downside to using TST (R3)+ instead? The whole file is here: https://github.com/PDP-10/its-vault/blob/master/files/sysen2/urug.27 _______________________________________________ Simh mailing list Simh@trailing-edge.com http://mailman.trailing-edge.com/mailman/listinfo/simh
