169 lines
12 KiB
HTML
169 lines
12 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 0A
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 0A - IRQ2 - LPT2 (PC), VERTICAL RETRACE INTERRUPT (EGA,VGA) -
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Notes: the TOPS and PCnet adapters use this interrupt request line by default
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DOS 3.2 revectors IRQ2 to a stack-switching routine; DOS 3.3+ does so
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unless STACKS=0 has been set in CONFIG.SYS. MS/PC-DOS 3.3+ use the
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IBM Interrupt Sharing Protocol (see #02568) when hooking this IRQ
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on ATs and above, the physical data line for IRQ2 is labeled IRQ9 and
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connects to the slave 8259. The BIOS redirects the interrupt for
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IRQ9 back here.
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under DESQview, only the INT 15h vector and BASIC segment address (the
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word at 0000h:0510h) may be assumed to be valid for the handler's
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process
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">
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</HEAD>
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<BODY BGCOLOR="#FFD0A0">
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<center>
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<h2>Int 0A
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</h2>
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</center><p>
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<td>
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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>IRQ2 - LPT2 (PC), VERTICAL RETRACE INTERRUPT (EGA,VGA)</font></h3>
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<p><b>Notes:</b>
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The TOPS and PCnet adapters use this interrupt request line by default.
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DOS 3.2 revectors IRQ2 to a stack-switching routine; DOS 3.3+ does so
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unless STACKS=0 has been set in CONFIG.SYS. MS/PC-DOS 3.3+ use the
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IBM Interrupt Sharing Protocol <a href="rb-4214.htm#Table2568" tppabs="http://www.ctyme.com/intr/rb-4214.htm#Table2568">(see #02568)</a> when hooking this IRQ.
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On ATs and above, the physical data line for IRQ2 is labeled IRQ9 and
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connects to the slave 8259. The BIOS redirects the interrupt for
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IRQ9 back here..
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Under DESQview, only the INT 15h vector and BASIC segment address (the
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word at 0000h:0510h) may be assumed to be valid for the handler's
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process.
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Many VGA boards do not implement the vertical retrace interrupt,
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including the IBM VGA Adapter where the traces are either cut or
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removed
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<p><b>See Also:</b>
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<a href="rb-6339.htm" tppabs="http://www.ctyme.com/intr/rb-6339.htm">INT 52"DESQview"</a> - <a href="rb-6372.htm" tppabs="http://www.ctyme.com/intr/rb-6372.htm">INT 5A"DoubleDOS"</a> - <a href="rb-7799.htm" tppabs="http://www.ctyme.com/intr/rb-7799.htm">INT 71</a> - <a href="rb-7839.htm" tppabs="http://www.ctyme.com/intr/rb-7839.htm">INT 7A"GO32"</a>
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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-0a-1.htm" tppabs="http://www.ctyme.com/intr/int-0A.htm">
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Int 0Ah</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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<img src="lup.gif" tppabs="http://graphics.ctyme.com/gif/lup.gif" border=0 alt=Prev></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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