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<td colspan=6><img src="icons/flag.gif"></td><td colspan=4></td><td colspan=6 align="right">附錄A 21H中斷功能調用</td> <!章節(jié)名>
<td></td><td>-329-</td><td></td> <!頁碼>
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<td width=5%>AH</td><td width=35%>功能</td><td width=30%>調用參數(shù)</td><td width=30%>返回參數(shù)</td>
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<td width=5%>1B</td><td width=35%>取缺省驅動器的FAT信息</td><td width=30%></td><td width=30%>AL=每簇扇區(qū)數(shù)<br>DS:BX=FAT標識字節(jié)<br>CX=物理扇區(qū)的大小<br>DX=缺省驅動器的簇數(shù)</td>
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<td width=5%>1C</td><td width=35%>取任意驅動器的FAT信息</td><td width=30%>DL=驅動器號</td><td width=30%>同1BH功能</td>
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<td width=5%>21</td><td width=35%>隨機讀</td><td width=30%>DS:DX=FCB首地址</td><td width=30%>AL=00：讀成功<br>AL=01：文件已到末尾<br>AL=02：DTA溢出<br>AL=03：讀入部分數(shù)據(jù)</td>
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<td width=5%>22</td><td width=35%>隨機寫</td><td width=30%>DS:DX=FCB首地址</td><td width=30%>AL=00：寫成功<br>AL=01：磁盤滿<br>AL=02：DTA溢出</td>
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<td width=5%>23</td><td width=35%>測定文件大小</td><td width=30%>DS:DX=FCB首地址</td><td width=30%>AL=00：成功，文件長度寫入FCB<br>AL=FF：失敗</td>
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<td width=5%>24</td><td width=35%>設置隨機記錄號</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%>設置中斷向量</td><td width=30%>DS:DX=中斷向量<br>AL=中斷號</td><td width=30%></td>
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<td width=5%>26</td><td width=35%>建立程序段前綴</td><td width=30%>DS:DX=新的程序段前綴</td><td width=30%></td>
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<td width=5%>27</td><td width=35%>隨機塊讀</td><td width=30%>DS:DX=FCB首地址<br>CX=讀入記錄數(shù)</td><td width=30%>AL=00：讀成功<br>AL=01：文件已到末尾<br>AL=02：DTA溢出<br>AL=03：讀入部分數(shù)據(jù)</td>
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<td width=5%>28</td><td width=35%>隨機塊寫</td><td width=30%>DS:DX=FCB首地址<br>CX=寫出記錄數(shù)</td><td width=30%>AL=00：寫成功<br>AL=01：磁盤滿<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=控制分析標志</td><td width=30%>AL=00：標準文件<br>AL=01多義文件<br>AL=FF：非法盤符</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（二進制）</td>
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<td width=5%>2B</td><td width=35%>設置日期</td><td width=30%>CX:DH:DL=年：月：日</td><td width=30%>AL=00：成功<br>AL=FF：出錯</td>
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<td width=5%>2C</td><td width=35%>取時間</td><td width=30%></td><td width=30%>CH:CL=時：分<br>DH:DL=秒：1/100秒</td>
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<td width=5%>2D</td><td width=35%>設置時間</td><td width=30%>CH:CL=時：分<br>DH:DL=秒：1/100秒</td><td width=30%>AL=00：成功<br>AL=FF：出錯</td>
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<td width=5%>2E</td><td width=35%>置磁盤自動讀寫標志</td><td width=30%>AL=00：關閉標志<br>AL=01：打開標志</td><td width=30%></td>
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<td width=5%>2F</td><td width=35%>取磁盤緩沖區(qū)首地址</td><td width=30%></td><td width=30%>ES:BX=緩沖區(qū)首地址</td>
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<td width=5%>30</td><td width=35%>取DOS版本號</td><td width=30%></td><td width=30%>AH=發(fā)行號；AL=版號</td>
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<td width=5%>31</td><td width=35%>結束進程并駐留</td><td width=30%>AL=返回碼<br>DX=駐留區(qū)大小（節(jié)）</td><td width=30%></td>
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<td width=5%>33</td><td width=35%>Ctrl-Break檢測</td><td width=30%>AL=00：取狀態(tài)<br>AL=01：置狀態(tài)（DL）<br>DL=00：關閉檢測<br>DL=01：打開檢測</td><td width=30%>DL=00：關閉Ctrl-Break檢測<br>DL=01：打開Ctrl-Break檢測</td>
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<td width=5%>35</td><td width=35%>取中斷向量</td><td width=30%>AL=中斷號</td><td width=30%>ES：BX=中斷向量</td>
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