249 lines
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249 lines
14 KiB
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<TITLE>Int 2F/AX=1605h
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<META NAME="Description" CONTENT="
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Int 2F/AX=1605h - MS Windows - WINDOWS ENHANCED MODE & 286 DOSX INIT BROADCAST -
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AX = 1605h
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ES:BX = 0000h:0000h
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DS:SI = 0000h:0000h
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CX = 0000h
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DX = flags
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bit 0 = 0 if Windows enhanced-mode initialization
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bit 0 = 1 if Microsoft 286 DOS extender initialization
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bits 1-15 reserved (undefined)
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DI = version number (major in upper byte, minor in lower)
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Return: CX = 0000h if okay for Windows to load
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">
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<h2>Int 2F/AX=1605h
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<h3><font color=#C00040>MS Windows - WINDOWS ENHANCED MODE & 286 DOSX INIT BROADCAST</font></h3>
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<PRE>
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AX = 1605h
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ES:BX = 0000h:0000h
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DS:SI = 0000h:0000h
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CX = 0000h
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DX = flags
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bit 0 = 0 if Windows enhanced-mode initialization
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bit 0 = 1 if Microsoft 286 DOS extender initialization
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bits 1-15 reserved (undefined)
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DI = version number (major in upper byte, minor in lower)<br>
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<p><b>Return:</b><br>CX = 0000h if okay for Windows to load
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CX = FFFFh (other registers unchanged) if Windows 3.0 in standard mode
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CX <> 0 if Windows should not load
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ES:BX -> startup info structure <a href="rb-4498.htm#Table2631" tppabs="http://www.ctyme.com/intr/rb-4498.htm#Table2631">(see #02631)</a>
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DS:SI -> virtual86 mode enable/disable callback or 0000h:0000h
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<a href="rb-4498.htm#Table2634" tppabs="http://www.ctyme.com/intr/rb-4498.htm#Table2634">(see #02634)</a>
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</PRE>
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<p><b>Notes:</b>
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The Windows enhanced mode loader and Microsoft 286 DOS extender will
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broadcast an INT 2F/AX=1605h call when initializing. Any DOS device
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driver or TSR can watch for this broadcast and return the appropriate
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values. If the driver or TSR returns CX <> 0, it is also its
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responsibility to display an error message (however, Windows95 is
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reported to load regardless of the returned CX)..
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Each handler must first chain to the prior INT 2F handler with
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registers unchanged before processing the call.
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If the handler requires local data on a per-VM basis, it must store the
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returned ES:BX in the "next" field of a startup info structure and
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return a pointer to that structure in ES:BX.
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A single TSR may set the V86 mode enable/disable callback; if DS:SI is
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already nonzero, the TSR must fail the initialization by setting CX
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nonzero.
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MSD checks for Windows 3.0 running in standard mode by testing whether
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CX=FFFFh and other registers are unchanged on return.
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Novell DOS v7.0 (Update 8 - Update 11) TASKMGR in multitasking mode
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uses this broadcast, even if TASKMGR.INI sets WinPresent= to OFF.
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Microsoft's EMM386.EXE for DOS 5+ when installed with the NOEMS option
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changes its driver name from EMMQXXX0 to EMMXXXX0 while Windows is
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active
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<p><b>See Also:</b>
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<a href="rb-4499.htm" tppabs="http://www.ctyme.com/intr/rb-4499.htm">AX=1606h</a> - <a href="rb-4517.htm" tppabs="http://www.ctyme.com/intr/rb-4517.htm">AX=1608h</a> - <a href="rb-4865.htm" tppabs="http://www.ctyme.com/intr/rb-4865.htm">AX=4B05h</a>
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<PRE>
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<p>
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Format of Windows Startup Information Structure:
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<a name=table2631></a>
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Offset Size Description (Table 02631)
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00h 2 BYTEs major, minor version of info structure
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02h DWORD pointer to next startup info structure or 0000h:0000h
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06h DWORD pointer to ASCIZ name of virtual device file or 0000h:0000h
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0Ah DWORD virtual device reference data <a href="rb-4498.htm#Table2633" tppabs="http://www.ctyme.com/intr/rb-4498.htm#Table2633">(see #02633)</a>
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(only used if above nonzero)
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0Eh DWORD pointer to instance data records <a href="rb-4498.htm#Table2632" tppabs="http://www.ctyme.com/intr/rb-4498.htm#Table2632">(see #02632)</a> or 0000h:0000h
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---structure version >= 4.0---
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12h DWORD pointer to optionally-instanced data records <a href="rb-4498.htm#Table2632" tppabs="http://www.ctyme.com/intr/rb-4498.htm#Table2632">(see #02632)</a>
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or 0000h:0000h
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<p>
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Format of one Instance Item in array:
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<a name=table2632></a>
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Offset Size Description (Table 02632)
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00h DWORD address of instance data (end of array if 0000h:0000h)
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04h WORD size of instance data
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</PRE>
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<p><b>See Also:</b>
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#02631
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<PRE>
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<p>
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Format of Virtual Device Reference Data:
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<a name=table2633></a>
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Offset Size Description (Table 02633)
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00h DWORD physical address of ??? or 00000000h
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04h DWORD physical address of ??? table
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08h DWORD "DEST_PAGE" address to which pages must be mapped
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0Ch N DWORDs "SRC_PAGE" physical addresses of the pages
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00000000h = end of table
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</PRE>
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<p><b>Note:</b>
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EMM386.EXE sets the first pointer to the start of the device driver
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chain, the second pointer to a field of 40h bytes followed by a
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16-bit offset to the end of the SRC_PAGE table, and DEST_PAGE to
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the start segment of the UMB area
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<p><b>See Also:</b>
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#02631
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<PRE>
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<p>
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<a name=table2634></a>
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(Table 02634)
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Values Windows virtual mode enable/disable procedure is called with:.
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AX = 0000h disable V86 mode.
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AX = 0001h enable V86 mode.
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Interrupts disabled<br>
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<p><b>Return:</b><br>CF set on error
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CF clear if successful
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interrupts disabled
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</PRE>
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<p><b>See Also:</b>
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#02631
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<p>
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<b>Category: <a href="cat-049.htm" tppabs="http://www.ctyme.com/intr/cat-049.htm">
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Windows</a>
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- <a href="int-2f-1.htm" tppabs="http://www.ctyme.com/intr/int-2F.htm">
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Int 2Fh</a>
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