if (len === 0) return []; // 补充空数组边界，避免后续逻辑出错
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.
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阿爸是上世纪七十年代被阿嬷买回来的，20元。当时他四个月大。他的生母在当地一家医院做保洁，晚上拖地、倒垃圾，白天抱着他在医院看病。阿爸那时一直发烧拉肚子，反反复复，看不好。
Фото: Максим Блинов / РИА Новости。关于这个话题，搜狗输入法下载提供了深入分析
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Jess Scott, part of the team behind Guilfest, an annual two-day music festival in Surrey, knows just how important connectivity is for both ticket holders and organizers, however large or small an event is.