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<TITLE>Int 21/AX=4458h
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Int 21/AX=4458h - DR DOS 5.0+ internal - GET POINTER TO INTERNAL VARIABLE TABLE -
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AX = 4458h
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Return: ES:BX - internal variable table (see #01584,#01585)
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AX = ??? (0B50h for DR DOS 5.0, 0A56h for DR DOS 6.0, 0FE4h for
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Novell DOS 7)
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SeeAlso: AX=4452h
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Format of DR DOS 5.0-6.0 internal variable table:
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Offset Size Description (Table 01584)
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00h WORD ???
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02h WORD segment of ???
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">
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<h2>Int 21/AX=4458h
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<h3><font color=#C00040>DR DOS 5.0+ internal - GET POINTER TO INTERNAL VARIABLE TABLE</font></h3>
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<PRE>
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AX = 4458h<br>
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<p><b>Return:</b><br>ES:BX -> internal variable table (see #01584,#01585)
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AX = ??? (0B50h for DR DOS 5.0, 0A56h for DR DOS 6.0, 0FE4h for
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Novell DOS 7)
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</PRE>
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<p><b>See Also:</b>
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<a href="rb-2920.htm" tppabs="http://www.ctyme.com/intr/rb-2920.htm">AX=4452h</a>
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<PRE>
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<p>
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Format of DR DOS 5.0-6.0 internal variable table:
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<a name=table1584></a>
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Offset Size Description (Table 01584)
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00h WORD ???
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02h WORD segment of ???
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04h WORD offset within DOS data segment of history control structure
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for COMMAND.COM history buffer <a href="rb-2925.htm#Table1586" tppabs="http://www.ctyme.com/intr/rb-2925.htm#Table1586">(see #01586)</a>
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06h WORD offset within DOS data segment of history control structure
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for application history buffer <a href="rb-2925.htm#Table1586" tppabs="http://www.ctyme.com/intr/rb-2925.htm#Table1586">(see #01586)</a>
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08h BYTE initial history state flags <a href="rb-2922.htm#Table1583" tppabs="http://www.ctyme.com/intr/rb-2922.htm#Table1583">(see #01583)</a>
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09h 2 BYTEs ???
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0Bh WORD KB of extended memory at startup
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0Dh BYTE number of far jump entry points
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0Eh WORD segment containing far jumps to DR DOS entry points <a href="rb-2925.htm#Table1587" tppabs="http://www.ctyme.com/intr/rb-2925.htm#Table1587">(see #01587)</a>
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10h WORD (only if kernel loaded in HMA) offset in HMA of first free HMA
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memory block <a href="rb-2925.htm#Table1588" tppabs="http://www.ctyme.com/intr/rb-2925.htm#Table1588">(see #01588)</a> or 0000h if none; segment is FFFFh
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12h WORD pointer to segment of environment variables set in CONFIG,
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or 0000h if already used
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---DR DOS 6.0---
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14h WORD (only if kernel loaded in HMA) offset in HMA of first used HMA
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memory block <a href="rb-2925.htm#Table1588" tppabs="http://www.ctyme.com/intr/rb-2925.htm#Table1588">(see #01588)</a> or 0000h if none; segment is FFFFh
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16h 8 BYTEs ???
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1Eh WORD offset in DOS data segment of full COUNTRY.SYS filename
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20h 8 BYTEs ???
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28h WORD offset in DOS data segment of SHARE hook table
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2Ah 2 BYTEs ???
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2Ch WORD offset in DOS data segment of far pointer to INT 2F/AX=1000h
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handler
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</PRE>
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<p><b>Notes:</b>
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The segment used for the DR DOS 6.0 CONFIG environment variables
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(excluding COMSPEC, VER and OS) is only useful for programs/drivers
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called from CONFIG.SYS. The word is set to zero later when the area
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is copied to the COMMAND.COM environment space. This allows
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CONFIG.SYS to pass information to AUTOEXEC.BAT..
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The Novell DOS 7 KEYB uses offsets 10h,14h, and 2Ch in the same was
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as for DR DOS 6.0, so it is likely that the entire table is the same
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<PRE>
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<p>
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Format of Novell DOS 7 internal variable table:
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<a name=table1585></a>
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Offset Size Description (Table 01585)
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00h ???
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1Eh WORD offset of COUNTRY.SYS filename
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42h 16 DWORDs pointers to ??? entry points.
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???
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<p>
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Format of history control structure:
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<a name=table1586></a>
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Offset Size Description (Table 01586)
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00h WORD segment of buffer
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02h WORD size of buffer in bytes
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04h WORD ???
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<p>
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Format of kernel entry jump table for DR DOS 5.0-6.0:
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<a name=table1587></a>
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Offset Size Description (Table 01587)
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00h 5 BYTEs far jump to kernel entry point for CP/M CALL 5
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05h 5 BYTEs far jump to kernel entry point for INT 20
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0Ah 5 BYTEs far jump to kernel entry point for INT 21
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0Fh 5 BYTEs far jump to kernel entry point for INT 22 (RETF)
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14h 5 BYTEs far jump to kernel entry point for INT 23 (RETF)
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19h 5 BYTEs far jump to kernel entry point for INT 24
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1Eh 5 BYTEs far jump to kernel entry point for INT 25
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23h 5 BYTEs far jump to kernel entry point for INT 26
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28h 5 BYTEs far jump to kernel entry point for INT 27
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2Dh 5 BYTEs far jump to kernel entry point for INT 28
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32h 5 BYTEs far jump to kernel entry point for INT 2A (IRET)
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37h 5 BYTEs far jump to kernel entry point for INT 2B (IRET)
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3Ch 5 BYTEs far jump to kernel entry point for INT 2C (IRET)
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41h 5 BYTEs far jump to kernel entry point for INT 2D (IRET)
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46h 5 BYTEs far jump to kernel entry point for INT 2E (IRET)
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4Bh 5 BYTEs far jump to kernel entry point for INT 2F
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</PRE>
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<p><b>Notes:</b>
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All of these entry points are indirected through this jump table
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to allow the kernel to be relocated into high memory while leaving
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the actual entry addresses in low memory for maximum compatibility.
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Some of these entry points (22h,23h,24h,2Eh,2Fh) are replaced as soon
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as COMMAND.COM is loaded, and return immediately to the caller, some
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returning an error code (the original handler for INT 2F returns
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AL=03h [fail]).
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<PRE>
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<p>
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Format of HMA Memory Block (DR DOS 6.0 kernel loaded in HMA):
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<a name=table1588></a>
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Offset Size Description (Table 01588)
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00h WORD offset of next HMA Memory Block (0000h if last block)
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02h WORD size of this block in bytes (at least 10h)
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04h BYTE type of HMA Memory Block (interpreted by MEM)
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00h system
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01h KEYB
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02h NLSFUNC
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03h SHARE
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04h TaskMAX
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05h COMMAND
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05h var TSR (or system) code and data. DR DOS TSR's, such as KEYB,
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hooks interrupts using segment FFFEh instead FFFFh.
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</PRE>
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<p>
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<b>Category: <a href="cat-030.htm" tppabs="http://www.ctyme.com/intr/cat-030.htm">
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Int 21h</a>
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