The tradeoff is complexity. The microcode must be carefully arranged so that the instructions in delay slots are either useful setup for both paths, or at least harmless if the redirect fires. Not every case is as clean as RETF. When a PLA redirect interrupts an LCALL, the return address is already pushed onto the microcode call stack (yes, the 386 has a microcode call stack) -- the redirected code must account for this stale entry. When multiple protection tests overlap, or when a redirect fires during a delay slot of another jump, the control flow becomes hard to reason about. During the FPGA core implementation, protection delay slot interactions were consistently the most difficult bugs to track down.
drop-oldest: Drops the oldest buffered data to make room. Useful for live feeds where stale data loses value.，更多细节参见谷歌浏览器【最新下载地址】
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这在当时是华强北最常见的模式，工厂代工生产（ 不涉及产品核心设计 ），国际用户拿到手贴上自己品牌去卖。货一出海，价格往往能翻好几倍，但这跟代工厂没关系，国内这些工厂赚的，就只是最底层那薄薄一层加工费。