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docs/interrupts/int-html/rb-4214.htm
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docs/interrupts/int-html/rb-4214.htm
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<HTML>
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<HEAD>
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<TITLE>Int 2D
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 2D - ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [v3.6] -
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AH = multiplex number
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AL = function
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00h installation check
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01h get private entry point
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02h uninstall
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03h request popup
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04h determine chained interrupts
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05h get hotkey list
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06h get device-driver information
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07h-0Fh reserved for future enhancements
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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 2D
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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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<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>ALTERNATE MULTIPLEX INTERRUPT SPECIFICATION (AMIS) [v3.6]</font></h3>
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<PRE>
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AH = multiplex number
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AL = function
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00h installation check
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01h get private entry point
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02h uninstall
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03h request popup
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04h determine chained interrupts
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05h get hotkey list
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06h get device-driver information
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07h-0Fh reserved for future enhancements
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<p><b>Return:</b><br>AL = 00h (not implemented)
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other application-dependent.
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Other registers vary by function (also see individual entries below)<br>
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<p><b>Return:</b><br>Varies by function
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</PRE>
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<p><b>Notes:</b>
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Programs should not use fixed multiplex numbers; rather, a program
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should scan all multiplex numbers from 00h to FFh, remembering the
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first unused multiplex in case the program is not yet installed.
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For multiplex numbers which are in use, the program should compare
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the first 16 bytes of the signature string to determine whether it
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is already installed on that multiplex number. If not previously
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installed, it should use the first free multiplex number..
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Functions other than 00h are not valid unless a program is installed
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on the selected multiplex number.
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To be considered fully compliant with version 3.6 of the specification,
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programs must implement at least functions 00h, 02h (no resident
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uninstall code required), and 04h (return value 04h). TSRs that
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provide hotkeys with which the user can activate them must also
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implement function 05h. TSRs which provide DOS device drivers must
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also implement function 06h. The absolute minimum fully-compliant
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implementation has an overhead of 64 bytes (80 bytes with function
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05h) plus 22 bytes per hooked interrupt (for the interrupt sharing
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protocol header and hook list entry)..
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The signature string and description may be used by memory mappers
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to display the installed programs.
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To be considered fully compliant, users of this specification must
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adhere to the IBM interrupt sharing protocol <a href="rb-4214.htm#Table2568" tppabs="http://www.ctyme.com/intr/rb-4214.htm#Table2568">(see #02568)</a>, which will
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permit removal of TSRs in arbitrary order and interrupt handler
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reordering. All TSRs following this specification should be
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removable unless they are loaded from CONFIG.SYS, though they need
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not keep the code for removing themselves resident; it is acceptable
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for a separate program to perform the interrupt unhooking and
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memory-freeing steps of removal..
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A sample public-domain implementation including example TSRs and
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utility programs may be found in a separate package distributed as
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AMISLnnn.ZIP (AMISL092.ZIP as of this writing)..
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Please let me know if you choose to follow this proposal. The
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signature and a list of the private API calls you use would be
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appreciated, as well.
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<p><b>See Also:</b>
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INT 2D/AL=00h - INT 2D/AL=01h - INT 2D/AL=02h - INT 2D/AL=03h - INT 2D/AL=04h
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<p><b>See Also:</b>
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INT 2D/AL=05h - INT 2D/AL=06h - <a href="rb-4251.htm" tppabs="http://www.ctyme.com/intr/rb-4251.htm">INT 2F"NOTES"</a>
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<PRE>
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<p>
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Format of interrupt sharing protocol interrupt handler entry point:
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<a name=table2568></a>
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Offset Size Description (Table 02568)
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00h 2 BYTEs short jump to actual start of interrupt handler, immediately
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following this data block (EBh 10h)
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02h DWORD address of next handler in chain
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06h WORD signature 424Bh
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08h BYTE EOI flag
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00h software interrupt or secondary hardware interrupt handler
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80h primary hardware interrupt handler (will issue EOI to
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interrupt controller)
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09h 2 BYTEs short jump to hardware reset routine
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must point at a valid FAR procedure (may be just RETF)
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0Bh 7 BYTEs reserved (0) by IBM for future expansion
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</PRE>
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<p><b>Note:</b>
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When chaining to the prior handler, the interrupt handler must perform
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an indirect jump/call using the address at offset 02h in the
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ISP header. This permits another AMIS TSR to hook itself into
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the chain at a position other than as the first handler to receive
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an interrupt.
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<p><b>See Also:</b>
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<a href="rb-8674.htm" tppabs="http://www.ctyme.com/intr/rb-8674.htm">INT F1/AH=01h"Common ISDN API"</a> - <a href="rb-8674.htm" tppabs="http://www.ctyme.com/intr/rb-8674.htm">INT F1/AH=06h"CAPI"</a> - #04068
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<p>
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<b>Category: <a href="cat-042.htm" tppabs="http://www.ctyme.com/intr/cat-042.htm">
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TSR Libraries</a>
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- <a href="int-2d-1.htm" tppabs="http://www.ctyme.com/intr/int-2D.htm">
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Int 2Dh</a>
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- <a href="alpha-a.htm" tppabs="http://www.ctyme.com/intr/alpha-a.htm">
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A</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><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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