更新 README.md

e148b0c0 · 李川 · a762bfa8 · e148b0c0
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 # 说明
 Intel 8253 可编程定时计数器
 # 原理图
-![8253](https://www.codecode.net/engintime/Dream-Logic/Intel-classic-chips/8253/raw/master/8253.dlsche.svg)
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+![raw svg](8253.dlsche.svg)
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