add .svg to README.md

88bb0e1f · 李川 · eb18ff2d · 88bb0e1f
--- a/README.md
+++ b/README.md
 # 说明
 Intel 8237A DMA 控制器
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+# 原理图
+![8237A](https://www.codecode.net/engintime/Dream-Logic/Intel-classic-chips/8237/raw/master/8237A.dlsche.svg)
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