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day3.1

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第3天第一部分,对应书上P46-P50
添加的代码,功能是:读取软盘的第二个扇区的内容,到内存0x8200开始的地方
为什么是加载到0x8200这个地方:
0x7c00-0x7dff:ipl(启动引导区)
0x7e00-0x7fff:ipl的数据和堆栈占用
0x8000-0x81ff:ipl的备份占用