📄 write your own operating system - lesson 5.htm
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<DIV class=Section1>
<P class=MsoTitle><A name=_Toc534120514>Write Your Own Operating System
Tutorial</A></P>
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<H1><A name=_Toc534120518>Lesson 5: Let抯 Make It Interactive</A></H1>
<P class=MsoNormal>All of this printing stuff to the screen is fun, but no
operating system would be any good at all if it did not provide any
interactivity.<SPAN style="mso-spacerun: yes"> </SPAN>Let抯 make it read
input from the keyboard.<SPAN style="mso-spacerun: yes"> </SPAN>Again we
will be using calls to a function in BIOS to read the keyboard.</P>
<P class=MsoNormal>We are going to be using function 0, interrupt 0x16.<SPAN
style="mso-spacerun: yes"> </SPAN>This is done easily with the following
two instructions.</P>
<P class=MsoNormal style="MARGIN-BOTTOM: 0pt"><SPAN
style="FONT-FAMILY: 'Courier New'"><SPAN
style="mso-tab-count: 1"> </SPAN>xor<SPAN
style="mso-tab-count: 1"> </SPAN>ah, ah<SPAN
style="mso-tab-count: 1"> </SPAN>; we want function
zero<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 0pt"><SPAN
style="FONT-FAMILY: 'Courier New'"><SPAN
style="mso-tab-count: 1"> </SPAN>int<SPAN
style="mso-tab-count: 1"> </SPAN>0x16<SPAN style="mso-tab-count: 1">
</SPAN>; wait for a keypress<o:p></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN-BOTTOM: 0pt"><SPAN
style="FONT-FAMILY: 'Courier New'"><![if !supportEmptyParas]><![endif]> <o:p></o:p></SPAN></P>
<P class=MsoNormal>This function causes the computer to pause and does not
return until a key is pressed.<SPAN style="mso-spacerun: yes"> </SPAN>This
can be used in a 揚ress any key to continue⌨️ 快捷键说明
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