发信人: tomf()
整理人: yangcs(2000-04-08 08:34:36), 站内信件
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直接从MSDN上摘下来的，懒得翻译，反正这点英文应该难不倒各位的。
另外，我曾经很武断的说在主引导区内没有INT13的扩展调用，在此向
被我误导（如果有的话）的同志致以诚挚的歉意
Check Extensions Present
Entry:
AH = 41h
BX = 55AAh
DL = Drive number
Exit:
carry clear
AH = Major version of extensions
AL = Internal Use Only
BX = AA55h
CX = API subset support bitmap
carry set
AH = error code = 01h, Invalid Command
This function is used to check for the presence
of the INT 13h extensions for a particular drive.
If the carry flag is returned set, the extensions
are not supported for this drive.
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※ 修改:．tomf 于 Apr 4 11:26:12 修改本文．[FROM: 202.104.64.113]
※ 来源:．月光软件站 http://www.moon-soft.com．[FROM: 202.104.64.113]
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