1. I wrote a markdown file with the specification of what I wanted to do. Just English, high level ideas about the scope of the Z80 emulator to implement. I said things like: it should execute a whole instruction at a time, not a single clock step, since this emulator must be runnable on things like an RP2350 or similarly limited hardware. The emulator should correctly track the clock cycles elapsed (and I specified we could use this feature later in order to implement the ZX Spectrum contention with ULA during memory accesses), provide memory access callbacks, and should emulate all the known official and unofficial instructions of the Z80.
宽容从来不是单向的索取，而是双向的修行。一次两次，人家付之一笑，三次四次，是可忍孰不可忍？宽容是有限度的，忍耐是有底线的，再宽厚的胸怀，也经不起反复消耗；终有一天，这份宽容会消失殆尽，留下的只有疏远与冷漠，更可能是人家的反戈一击。
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