165 lines
12 KiB
HTML
165 lines
12 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 08
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 08 - IRQ0 - SYSTEM TIMER -
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Desc: generated 18.2 times per second by channel 0 of the 8254 system timer,
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this interrupt is used to keep the time-of-day clock updated
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Notes: programs which need to be invoked regularly should use INT 1C unless
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they need to reprogram the timer while still keeping the time-of-day
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clock running at the proper rate
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default handler is at F000h:FEA5h in IBM PC and 100%-compatible BIOSes
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may be masked by setting bit 0 on I/O port 21h
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SeeAlso: INT 1C,INT 4ASYSTEM,INT 50DESQview,INT 58DoubleDOS,INT 70IRQ8
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SeeAlso: INT 78GO32,INT D8Screen Thief,MEM 0040h:0040h,MEM 0040h:006Ch
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">
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<META NAME="robots" CONTENT="none">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 08
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</h2>
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</center><p>
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<table border=1 cellpadding=3 cellspacing=1>
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<td>
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<a href="javascript:if(confirm('http://www.ctyme.com/rbrown.htm \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/rbrown.htm'" tppabs="http://www.ctyme.com/rbrown.htm">
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<img src="lhome.gif" tppabs="http://graphics.ctyme.com/gif/lhome.gif" border=0 alt=Ralf Brown Page></a>
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<td><a href="int.htm" tppabs="http://www.ctyme.com/intr/int.htm">Interrups</a></td>
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<td><a href="cat.htm" tppabs="http://www.ctyme.com/intr/cat.htm">Categories</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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</td></table><p>
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<p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<h3><font color=#C00040>IRQ0 - SYSTEM TIMER</font></h3>
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<p><b>Desc:</b>
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Generated 18.2 times per second by channel 0 of the 8254 system timer,
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this interrupt is used to keep the time-of-day clock updated
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<p><b>Notes:</b>
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Programs which need to be invoked regularly should use INT 1C unless
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they need to reprogram the timer while still keeping the time-of-day
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clock running at the proper rate.
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Default handler is at F000h:FEA5h in IBM PC and 100%-compatible BIOSes.
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May be masked by setting bit 0 on I/O port 21h
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<p><b>See Also:</b>
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<a href="rb-2443.htm" tppabs="http://www.ctyme.com/intr/rb-2443.htm">INT 1C</a> - <a href="rb-6244.htm" tppabs="http://www.ctyme.com/intr/rb-6244.htm">INT 4A"SYSTEM"</a> - <a href="rb-6303.htm" tppabs="http://www.ctyme.com/intr/rb-6303.htm">INT 50"DESQview"</a> - <a href="rb-6365.htm" tppabs="http://www.ctyme.com/intr/rb-6365.htm">INT 58"DoubleDOS"</a> - <a href="javascript:if(confirm('http://www.ctyme.com/i \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://www.ctyme.com/i'" tppabs="http://www.ctyme.com/i"
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<p><b>See Also:</b>
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<a href="rb-7809.htm" tppabs="http://www.ctyme.com/intr/rb-7809.htm">INT 78"GO32"</a> - <a href="rb-8473.htm" tppabs="http://www.ctyme.com/intr/rb-8473.htm">INT D8"Screen Thief"</a> - MEM 0040h:0040h - MEM 0040h:006Ch
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<p>
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<b>Category: <a href="cat-019.htm" tppabs="http://www.ctyme.com/intr/cat-019.htm">
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Hardware</a>
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- <a href="int-08.htm" tppabs="http://www.ctyme.com/intr/int-08.htm">
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Int 08h</a>
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- <a href="alpha-i.htm" tppabs="http://www.ctyme.com/intr/alpha-i.htm">
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I</a>
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</b><p><p><img src="rbline.gif" tppabs="http://graphics.ctyme.com/gif/rbline.gif" width="100%" alt="------"><p>
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<td>
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<img src="lup.gif" tppabs="http://graphics.ctyme.com/gif/lup.gif" border=0 alt=Prev></a>
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<img src="ldown.gif" tppabs="http://graphics.ctyme.com/gif/ldown.gif" border=0 alt=Next></a>
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<td><a href="int.htm" tppabs="http://www.ctyme.com/intr/int.htm">Interrups</a></td>
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<td><a href="cat.htm" tppabs="http://www.ctyme.com/intr/cat.htm">Categories</a></td>
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<td><a href="alpha.htm" tppabs="http://www.ctyme.com/intr/alpha.htm">Contents</a></td>
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