256 lines
14 KiB
HTML
256 lines
14 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Int 2F/AX=4B02h/BX=0000h
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</TITLE>
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<META NAME="Description" CONTENT="
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Int 2F/AX=4B02h/BX=0000h - DOS 5+ TASK SWITCHER - INSTALLATION CHECK -
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AX = 4B02h
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BX = 0000h
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ES:DI = 0000h:0000h
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Return: ES:DI = 0000h:0000h if task switcher not loaded
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ES:DI - task switcher entry point (see #02819) if loaded
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AX = 0000h
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Notes: the returned entry point is that for the most-recently loaded task
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switcher; the entry points for prior task switchers may be determined
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with the get version call (see #02819)
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this function is supported by PC Tools v8+ CPTASK
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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 2F/AX=4B02h/BX=0000h
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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></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>DOS 5+ TASK SWITCHER - INSTALLATION CHECK</font></h3>
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<PRE>
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AX = 4B02h
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BX = 0000h
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ES:DI = 0000h:0000h<br>
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<p><b>Return:</b><br>ES:DI = 0000h:0000h if task switcher not loaded
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ES:DI -> task switcher entry point <a href="rb-4862.htm#Table2819" tppabs="http://www.ctyme.com/intr/rb-4862.htm#Table2819">(see #02819)</a> if loaded
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AX = 0000h
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</PRE>
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<p><b>Notes:</b>
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The returned entry point is that for the most-recently loaded task
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switcher; the entry points for prior task switchers may be determined
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with the "get version" call <a href="rb-4862.htm#Table2819" tppabs="http://www.ctyme.com/intr/rb-4862.htm#Table2819">(see #02819)</a>.
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This function is supported by PC Tools v8+ CPTASK
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<p><b>See Also:</b>
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<a href="rb-4819.htm" tppabs="http://www.ctyme.com/intr/rb-4819.htm">AX=4A05h</a> - <a href="rb-4863.htm" tppabs="http://www.ctyme.com/intr/rb-4863.htm">AX=4B03h</a>
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<PRE>
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<p>
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<a name=table2819></a>
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(Table 02819)
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Call task switcher entry point with:.
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AX = 0000h get version
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<p><b>Return:</b><br>CF clear if successful
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AX = 0000h
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ES:BX -> task switcher version struct <a href="rb-4862.htm#Table2820" tppabs="http://www.ctyme.com/intr/rb-4862.htm#Table2820">(see #02820)</a>
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CF set if unsupported function.
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AX = 0001h test memory region
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ES:DI -> first byte to be tested
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CX = size of region to test
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<p><b>Return:</b><br>CF clear if successful
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AX = memory type of tested region
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0000h global
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0001h global and local
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0002h local (replaced on session switch)
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CF set if unsupported function.
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AX = 0002h suspend switcher
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ES:DI -> new task switcher's entry point
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<p><b>Return:</b><br>CF clear if successful
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AX = state
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0000h switcher has been suspended
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0001h switcher not suspended, new switcher must
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abort
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0002h switcher not suspended, but new switcher
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may run anyway
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CF set if unsupported function.
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AX = 0003h resume switcher
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ES:DI -> new task switcher's entry point
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<p><b>Return:</b><br>CF clear if successful
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AX = 0000h
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CF set if unsupported function.
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AX = 0004h hook notification chain
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ES:DI -> callback info structure to be added to chain
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<a href="rb-4861.htm#Table2817" tppabs="http://www.ctyme.com/intr/rb-4861.htm#Table2817">(see #02817)</a>
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<p><b>Return:</b><br>CF clear if successful
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AX = 0000h
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CF set if unsupported function.
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AX = 0005h unhook notification chain
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ES:DI -> callback info structure to be removed from chain
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<a href="rb-4861.htm#Table2817" tppabs="http://www.ctyme.com/intr/rb-4861.htm#Table2817">(see #02817)</a>
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<p><b>Return:</b><br>CF clear if successful
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AX = 0000h
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CF set if unsupported function.
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AX = 0006h query API support
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BX = asynchronous API identifier
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<p><b>Return:</b><br>CF clear if successful
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AX = 0000h
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ES:BX -> API info structure <a href="rb-4862.htm#Table2821" tppabs="http://www.ctyme.com/intr/rb-4862.htm#Table2821">(see #02821)</a> for the
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client which provides the highest
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level of API support
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CF set if unsupported function
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<p>
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Format of task switcher version structure:
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<a name=table2820></a>
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Offset Size Description (Table 02820)
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00h WORD major version of supported protocol (current protocol is 1.0)
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02h WORD minor version of supported protocol
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04h WORD major version of task switcher
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06h WORD minor version of task switcher
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08h WORD task switcher ID (see AX=4B03h)
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0Ah WORD operation flags
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<p><b>bit 0:</b><br>Set if task switcher disabled
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<p><b>bits 1-15:</b><br>Reserved (0)
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0Ch DWORD pointer to ASCIZ task switcher name
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("MS-DOS Shell Task Switcher" for DOSSHELL task switcher)
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10h DWORD pointer to previous task switcher's entry point or 0000h:0000h
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<p>
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Format of API info structure:
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<a name=table2821></a>
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Offset Size Description (Table 02821)
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00h WORD size of structure in bytes (000Ah)
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02h WORD API identifier
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0001h NetBIOS
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0002h 802.2
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0003h TCP/IP
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0004h LAN Manager named pipes
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0005h Novell NetWare IPX
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04h WORD major version \ of highest version of API for which the support
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06h WORD minor version / level specified in the next field is provided
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08h WORD support level
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0001h minimal support
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0002h API-level support
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0003h switcher compatibility
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0004h seamless compatibility
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</PRE>
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<p>
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<b>Category: <a href="cat-011.htm" tppabs="http://www.ctyme.com/intr/cat-011.htm">
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DOS-Based Task Switchers/Multitaskers</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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D</a>
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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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