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<title>附录A 21H中断功能调用</title>
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<p><a href="content1.html">目录</a> <a href="page328.html">上一页</a> <a href="page330.html">下一页</a> <a href="page332.html">附录B</a></p>
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<td colspan=6><img src="icons/flag.gif"></td><td colspan=4></td><td colspan=6 align="right">附录A 21H中断功能调用</td> <!章节名>
<td></td><td>-329-</td><td></td> <!页码>
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<td width=5%>AH</td><td width=35%>功能</td><td width=30%>调用参数</td><td width=30%>返回参数</td>
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<td width=5%>1B</td><td width=35%>取缺省驱动器的FAT信息</td><td width=30%></td><td width=30%>AL=每簇扇区数<br>DS:BX=FAT标识字节<br>CX=物理扇区的大小<br>DX=缺省驱动器的簇数</td>
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<td width=5%>1C</td><td width=35%>取任意驱动器的FAT信息</td><td width=30%>DL=驱动器号</td><td width=30%>同1BH功能</td>
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<td width=5%>21</td><td width=35%>随机读</td><td width=30%>DS:DX=FCB首地址</td><td width=30%>AL=00：读成功<br>AL=01：文件已到末尾<br>AL=02：DTA溢出<br>AL=03：读入部分数据</td>
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<td width=5%>22</td><td width=35%>随机写</td><td width=30%>DS:DX=FCB首地址</td><td width=30%>AL=00：写成功<br>AL=01：磁盘满<br>AL=02：DTA溢出</td>
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<td width=5%>23</td><td width=35%>测定文件大小</td><td width=30%>DS:DX=FCB首地址</td><td width=30%>AL=00：成功，文件长度写入FCB<br>AL=FF：失败</td>
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<td width=5%>24</td><td width=35%>设置随机记录号</td><td width=30%>DS:DX=FCB首地址</td><td width=30%></td>
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<td width=5%>25</td><td width=35%>设置中断向量</td><td width=30%>DS:DX=中断向量<br>AL=中断号</td><td width=30%></td>
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<td width=5%>26</td><td width=35%>建立程序段前缀</td><td width=30%>DS:DX=新的程序段前缀</td><td width=30%></td>
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<td width=5%>27</td><td width=35%>随机块读</td><td width=30%>DS:DX=FCB首地址<br>CX=读入记录数</td><td width=30%>AL=00：读成功<br>AL=01：文件已到末尾<br>AL=02：DTA溢出<br>AL=03：读入部分数据</td>
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<td width=5%>28</td><td width=35%>随机块写</td><td width=30%>DS:DX=FCB首地址<br>CX=写出记录数</td><td width=30%>AL=00：写成功<br>AL=01：磁盘满<br>AL=02：DTA溢出</td>
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<td width=5%>29</td><td width=35%>分析文件名</td><td width=30%>ES:DI=FCB首地址<br>DS:SI=ASCIIZ串<br>AL=控制分析标志</td><td width=30%>AL=00：标准文件<br>AL=01多义文件<br>AL=FF：非法盘符</td>
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<td width=5%>2A</td><td width=35%>取日期</td><td width=30%></td><td width=30%>CX=年<br>DH:DL=月:日（二进制）</td>
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<td width=5%>2B</td><td width=35%>设置日期</td><td width=30%>CX:DH:DL=年：月：日</td><td width=30%>AL=00：成功<br>AL=FF：出错</td>
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<td width=5%>2C</td><td width=35%>取时间</td><td width=30%></td><td width=30%>CH:CL=时：分<br>DH:DL=秒：1/100秒</td>
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<td width=5%>2D</td><td width=35%>设置时间</td><td width=30%>CH:CL=时：分<br>DH:DL=秒：1/100秒</td><td width=30%>AL=00：成功<br>AL=FF：出错</td>
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<td width=5%>2E</td><td width=35%>置磁盘自动读写标志</td><td width=30%>AL=00：关闭标志<br>AL=01：打开标志</td><td width=30%></td>
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<td width=5%>2F</td><td width=35%>取磁盘缓冲区首地址</td><td width=30%></td><td width=30%>ES:BX=缓冲区首地址</td>
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<td width=5%>30</td><td width=35%>取DOS版本号</td><td width=30%></td><td width=30%>AH=发行号；AL=版号</td>
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<td width=5%>31</td><td width=35%>结束进程并驻留</td><td width=30%>AL=返回码<br>DX=驻留区大小（节）</td><td width=30%></td>
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<td width=5%>33</td><td width=35%>Ctrl-Break检测</td><td width=30%>AL=00：取状态<br>AL=01：置状态（DL）<br>DL=00：关闭检测<br>DL=01：打开检测</td><td width=30%>DL=00：关闭Ctrl-Break检测<br>DL=01：打开Ctrl-Break检测</td>
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<td width=5%>35</td><td width=35%>取中断向量</td><td width=30%>AL=中断号</td><td width=30%>ES：BX=中断向量</td>
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<td colspan=9><i>Copyright &copy; 2004-2005 <a href="mailto:webmaster@nucstorm.com">Chunk Lee</a></i></td>
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