INT 21 - DOS 2+ - GET DOS VERSION                                               
	AH = 30h
---DOS 5+ ---
	AL = what to return in BH
	    00h OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. number (see #01394)
	    01h version flag
Return: AL = major version number (00h if DOS 1.x)
	AH = minor version number
	BL:CX = 24-bit user serial number (most versions do not use this)
---if DOS <5 or AL=00h---
	BH = MS-DOS OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. number (see #01394)
---if DOS 5+ and AL=01h---
	BH = version flag
	    bit 3: DOS is in ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs.
	    other: reserved (0)
Notes:	the OS/2 v1.x Compatibility Box returns major version 0Ah (10)
	the OS/2 v2.x Compatibility Box returns major version 14h (20)
	OS/2 Warp 3.0 Virtual DOS Machines report v20.30; Warp 4 VDMs report
	  v20.40.
	the Windows NT DOS box returns version 5.00, subject to SETVER
	DOS 4.01 and 4.02 identify themselves as version 4.00; use
	  INT 21/AH=87h to distinguish between the original European MS-DOS 4.0
	  and the later PC-DOS 4.0x and MS-DOS 4.0x
	IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS 6.1 reports its version as 6.00; use the OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. number to
	  distinguish between MS-DOS 6.00 and IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS 6.1 (there was never an
	  IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS 6.0)
	IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911.'s PCIBM PC DOS 7 and Y2K updates report themselves as IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. 7.0 to be
	  distinguished from the MS-DOS 7.0 portion of Windows 95.
	MS-DOS 6.21 reports its version as 6.20; version 6.22 returns the
	  correct value
	Windows95 returns version 7.00 (the underlying MS-DOS), as did the
	  "Chicago" beta (reported in Microsoft Systems Journal ,August 1994);
	  Windows95 OSR2 and OSR2.5 (OPK3) return MS version 7.10
	DR DOS 5.0 and 6.0 report version 3.31; Novell DOS 7 reports IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. v6.00,
	  which some software displays as IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS v6.10 (because of the version
	  mismatch in true IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS, as mentioned above).  The Novell DOS 7
	  SETVER.EXE has an undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.).	 Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated. option /G x.y which sets the "global"
	  DOS version returned by this function for all executables not given
	  a specific version number in SETVER to major version x and minor
	  version y.
	Heiko Goeman's Advanced WinDOS 2.10/2.11/2.21 returns "IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911." DOS 5.00
	  (subject to SETVER) and serial number 0.
	All versions of CCI Multiuser DOS up to "CCI Multiuser DOS 7.22 Gold"
	  as of 1997-02-10 report DOS 3.31.
	DR DOS 3.31, 3.32, 3.33, 3.34, 3.35, 3.40, 3.41, 5.0, 6.0 and
	  DR PalmDOS/NetWare PalmDOS 1.0 report version 3.31;
	  DR DOS "Panther" BETA 1 and "StarTrek" report as 5.0.
	  Novell DOS 7, OpenDOS 7.01, DR-OpenDOS 7.02, DR-DOS 7.02, DR-DOS 7.03
	  all report themselves as IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. 6.00, which some software displays as
	  IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS 6.10 (because of the version mismatch in true IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911. DOS,
	  as mentioned above). Use INT 21/AX=4452h to distinguish the DR-DOS
	  family from PCIBM PC DOS.
	The Novell DOS 7 and OpenDOS 7.01 SETVER.EXE has an undocumentedInformation about a product which is not publicly available from the manufacturer, and must be determined by reverse-engineering (disassembly, trial-and-error, etc.).	 Undocumented information tends to change -- often dramatically -- between successive revisions of a product, since the manufacturer has no obligation to maintain compatibility in behavior which is not explicitly stated.
	  option /G x.y which sets the "global" DOS version returned by this
	  function for all executables not given a specific version number in
	  SETVER to major version x >= 5 and minor version y = 0..254,
	  y = 255 is used to disable the BDOS version check at INT 21/AX=4452h.
	A slightly modified option has been documented for DR-OpenDOS 7.02+:
	  in /X mode it now allows for x >= 1, while y >= 100 requires /X mode,
	  and y >= 128 is used to control advanced version control means now
	  (see below).
	DR-DOS 7.02+ IBMDOS.COM (since 1998-01-10) now recognizes optional
	  paths to filenames stored in the SETVER list. Previously such entries
	  were never found. This allows for a three staged model for SETVERed
	  versions:
	  highest priority = entry with path is matching.
	  middle priority = entry without path is matching.
	  lowest priority = use global version (SETVER /G).
	The DR-DOS 7.02+ SETVER 1.01+ (1998-01-12) has also been enhanced to
	  allow DOS *and* BDOS version faking (see INT 21/AX=4452h): In /X mode,
	  setting a sub-version of y = 128..255 will be reported as 0..127 DOS
	  sub-version, sub-versions of y = 100..127 will instead be used to
	  report this value as BDOS version (64h..7Fh) via INT 21/AX=4452h, and
	  the DOS revision stored in PCM_HEADER in the IBMDOS.COM file will
	  be used to report the DOS sub-version (usually this holds 0, but it
	  can be patched to other values, see INT 21/AX=4452h !!!).
	  Note, that DR-DOS SHARE 2.05+ (1998-01-05) has relaxed version
	  checking, and will install on any DOS revision 0..127, as long as
	  run on a DR-DOS 72h+ kernel (formerly it was bound to a revision
	  byte of 0 only).
	Under Novell DOS 7+, the SETVERing also affects the version number
	  WORD stored at offset +40h in each program's PSPsee Program Segment Prefix (see #01378).
	  This holds true even for special sub-versions of 100..255
	  (see INT 21/AX=4452h).
	generic MS-DOS 3.30, Compaq MS-DOS 3.31, and others identify themselves
	  as PC-DOS by returning OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. number 00h
	the version returned under DOS 4.0x may be modified by entries in
	  the special program list (see #01662 at AH=52h); the version returned
	  under DOS 5+ may be modified by SETVER--use AX=3306h to get the true
	  version number
SeeAlso: AX=3000h/BX=3000h,AX=3306h,AX=4452h,AH=87h,INT 15/AX=4900h
SeeAlso: AH=20h"S/DOS",INT 2F/AX=122Fh,INT 2F/AX=4010h,INT 2F/AX=4A33h
SeeAlso: INT 2F/AX=E002h


(Table 01394)
Values for DOS OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. number:
 00h *	IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911.
     -	(Novell DOS, Caldera OpenDOS, DR-OpenDOS, and DR-DOS 7.02+ report IBMInternational Busiuness MachinesInternational Busiuness Machines) A hardware, software and other service technology company founded in 1911.
	  as their OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor.)
 01h *	Compaq
 02h *	MS Packaged Product
 04h *	AT&TAmerican Telephone and Telegraph
 05h *	ZDS (Zenith Electronics, Zenith Electronics)
	Note:	Zenith DOS 3.30 supports >32MB hard disks; this OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. ID can be
		  used to detect that support
 06h *	Hewlett-Packard
 07h *	Zenith Data Systems (ZDS, Groupe Bull), for DOS 5.0+
 08h *	Tandon
 09h *	AST (AST Europe Ltd.)
 0Ah *	Asem
 0Bh *	Hantarex
 0Ch *	SystemsLine
 0Dh *	Packard-Bell
 0Eh *	Intercomp
 0Fh *	Unibit
 10h *	Unidata
 16h *	DEC
 17h *	Olivetti DOS
 23h *	Olivetti (may have been a typo, since 23 = 17h)
 28h *	Texas Instruments
 29h *	Toshiba
 33h -	Novell (Windows/386 device IDs only)
 34h *	MS Multimedia Systems (Windows/386 device IDs only)
 35h *	MS Multimedia Systems (Windows/386 device IDs only)
 4Dh *	Hewlett-Packard (HP)
 5Eh -	RxDOS (Api Software & Mike Podanoffsky)	 http://www.freedos.org/
 66h -	PhysTechSoft (PTS-DOS)	http://www.phystechsoft.com/
	probably Paragon Technology Systems Corporation PTS-DOS as well
 99h -	General Software's Embedded DOS
 CDh -	Paragon Technology Systems Corporation ("Source DOS" S/DOS 1.0+)
	(see also INT 21/AH=20h"S/DOS")
 EDh -	reserved for future OpenDOS/DR-DOS based projects  http://www.drdos.org
 EEh	DR DOS
 EFh	Novell DOS
	Note:	released versions of Novell DOS 7 use OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. ID 00h instead
 FDh	FreeDOS	 http://www.freedos.org/
 FFh *	Microsoft, Phoenix (listed as "undefined" by Microsoft)
Notes:	'*' indicates an OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. release of MS-DOS, while '-' indicates an OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor.
	  number used by a non-Microsoft DOS
	known OEM(Original Equipment Manufacturer) a company which purchases components that are resold as part of its own products under the company's own brand name, e.g. a Gateway 2000-branded monitor may actually be a Mag or NEC monitor. releases of MS-DOS:
	    AT&TAmerican Telephone and Telegraph DOS 3.10 (uses DOS 2.x cluster sizes and FATsee File Allocation Table structures)
	    Commodore DOS 3
	    Compaq DOS 3.31 (>32MB partitions similar to MS-DOS 4+)
	    Computerland DOS 3.10 (mix of DOS 2.x and 3.x disk mechanisms)
	    Eagle MS-DOS 1.25 (DOS 1.x with some hard disk support and built-in
		  ANSI.SYS functionality)
	    Epson Equity III DOS 3.10 (different clustering)
	    Leading Edge
	    NEC DOS 3.3
	    Olivetti DOS 2.11
	    Phoenix DOS 3.3, 4.01
	    Sanyo DOS 3.2
	    Tandy
	    Toshiba DOS
	    Unisys
	    Wyse MS-DOS 3
	    Zenith DOS 2.x (uses Zenith disk mechanism, extra drives at G:)
	    Zenith DOS 3.x (can be configured for Zenith or MS-DOS mechanism)
	    Zenith DOS 3.3 PLUS (>32MB partitions similar to MS-DOS 4+)