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CPU8080.steps(N) always executes a full instruction, even when that exceeds the number of machine cycles given. This makes the code unsuitable for emulating systems such as the Altair 8800, where "single-step" steps through cycles, rather than instructions. Cycle-stepping is important not only for accuracy, but also to make debugging easier, as described here.

It would be nice to have cycle-step functionality so that this web-based Altair 8800 emulator could work like a real Altair in this respect.

hi, reading the documentation for the processor, main reset shouldn't impact generic registers. Only PC, flag and interrupt enable.