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@whitequark yes. I implemented a step debugger, breakpoints and memory inspection when we designed the processor originally. In reality the code is all real time dsp, so debugging is mostly done in rtl/cocotb sim where we just spit out a trace file based on watching a variable and/or program counter. Or we do it in hardware using telemetry over a gigabit serial link where we can stream out whatever state we need to monitor. Or we use one channel of the audio output to monitor an internal node.