    CHKCPU
    09/09/2010
    by Jan Steunebrink

    Homepage: http://web.inter.nl.net/hcc/J.Steunebrink/
    E-mail  : J.Steunebrink@net.HCC.nl

    CPU Identification utility v1.20
    --------------------------------

Introduction
------------
After a CPU and/or motherboard upgrade, it can be difficult to find the
correct motherboard jumper settings for clockspeed, clock multiplier,
and (for 486 only) internal cache Write-Back/Write-Through mode selection.
I wrote the CHKCPU utility to have an easy check on these settings.
On the other hand, CHKCPU is also useful for checking the CPU type and speed
on a given machine and, due to its text-based output, information from CHKCPU
can easily be used to get CPU info from each machine in a network by calling
CHKCPU from the network log-on script.

The program
-----------
The program comes in a ZIP-file (CKCPU120.ZIP) which should contain the
following 3 files: CHKCPU.BAT  ;a batch file for easy use of the program
                   CHKCPU.EXE  ;the program
                   CHKCPU.TXT  ;this text file.
The files have a date-time stamp of 09/09/10 - 1:20 am.
The program is written in assembly language and it is freeware.

The program is started by typing CHKCPU at the command prompt.
CHKCPU can be run from the DOS prompt or from a DOS-box within Windows.
CHKCPU is designed to run under DOS 5.0 or higher, or any version of Windows.
The behavior of CHKCPU under OS/2 is unknown.

For complete information, I recommend running CHKCPU after a clean boot
to DOS, without an expanded memory manager (EMM386 or QEMM) loaded.
On most CPUs, CHKCPU can indicate the Clock multiplier and Bus clock speed
only in 'Real mode'.

To have a quick check on the CPU details under Windows, without opening a DOS
window and typing the required commands, unzip the CHKCPU.BAT and CHKCPU.EXE
files in a folder and double-click on the CHKCPU.BAT file in explorer.

CHKCPU output examples
----------------------
On my upgraded 586 PC, CHKCPU displays the following information:

 CPU Identification utility v1.20                 (c) 1997-2010 Jan Steunebrink
 ------------------------------------------------------------------------------
 CPU Vendor and Model: AMD K6-III+ 450/475/500/550
 Internal CPU speed  : 601.2 MHz  (using internal Time Stamp Counter)
 Clock Multiplier    : 6.0 
 Bus clock speed     : 100.2 MHz
 CPU-ID Vendor string: AuthenticAMD
 CPU-ID Name string  : AMD-K6(tm)-III Processor
 CPU-ID Signature    : 0005D0
                       |||||+- Stepping or sub-model no.
                       ||||+- Model: Indicates CPU Model and 486 L1 cache mode
                       |||+- Family: 4=486, Am5x86, Cx5x86
                       |||           5=Pentium, Nx586, Cx6x86, K5/K6, C6, mP6
                       |||           6=PentiumPro/II/III, CxMII/III, Athlon, C3
                       |||           F=Pentium4, Athlon64
                       ||+- Type: 0=Standard, 1=Overdrive, 2=2nd Dual Pentium
                       |+- Ext. Model: Extends the Base Model to an 8-bit value
                       +- Ext. Family: Extends the Base Family value
 Current CPU mode    : Real
 Internal (L1) cache : Enabled in Write-Back mode

On my Celeron M laptop CHKCPU shows:

 CPU Identification utility v1.20                 (c) 1997-2010 Jan Steunebrink
 ------------------------------------------------------------------------------
 CPU Vendor and Model: Intel Celeron M 410/420/423/430 C0-step
 Internal CPU speed  : 1727.6 MHz  (using internal Time Stamp Counter)
 Clock Multiplier    : 13.0
 Bus clock speed     : 132.8 MHz (QDR)
 CPU-ID Vendor string: GenuineIntel
 CPU-ID Name string  : Intel(R) Celeron(R) M CPU        430  @ 1.73GHz
 CPU-ID Signature    : 0006E8
                       |||||+- Stepping or sub-model no.
                       ||||+- Model: Indicates CPU Model and 486 L1 cache mode
                       |||+- Family: 4=486, Am5x86, Cx5x86
                       |||           5=Pentium, Nx586, Cx6x86, K5/K6, C6, mP6
                       |||           6=PentiumPro/II/III, CxMII/III, Athlon, C3
                       |||           F=Pentium4, Athlon64
                       ||+- Type: 0=Standard, 1=Overdrive, 2=2nd Dual Pentium
                       |+- Ext. Model: Extends the Base Model to an 8-bit value
                       +- Ext. Family: Extends the Base Family value
 Current CPU mode    : Real
 Internal (L1) cache : Enabled in Write-Back mode

Apart from this 'Normal' display, CHKCPU supports command-line switches
to get another format or to display additional CPU information.
You can get a list of these switches with the command CHKCPU /? or /H
The following switches are supported:
- With CHKCPU /C you get the CPUID only mode. In this mode, any code that
  does more than CPUID data processing, like speed measurement, is skipped.
  So this mode works like a safe detection mode and can be used for
  troubleshooting problems when using CHKCPU.
- With CHKCPU /D you get the Debug mode. It displays a dump of raw OS and
  relevant CPUID level information. Great for troubleshooting "Unknown"
  indications or getting info on new CPU models.
- With CHKCPU /F you get the Frequency mode. It displays the CPU Speed only.
  Intended for use in scripts. The output is in MHz but has no trailing 'MHz'.
- With CHKCPU /I you force the use of the Instruction timing method for CPU
  speed measurement. Useful if the TSC method gives an incorrect reading.
- With CHKCPU /R you force the use of Real (or Virtual) mode. Protected
  mode via the DOS Protected Mode Interface is then not used.
- With CHKCPU /S you get a Short display of CPU Type and Speed only.
  Intended for use in network logon scripts. The output has no trailing CR.
- With CHKCPU /V you get the Verbose mode. It displays additional CPUID info
  like CPU features, Instruction set extensions, and the sizes of the L1 and
  integrated L2/L3 cache.
  Some CPU features are only displayed for specific CPUs. These are:
   'CPU Serial Number Enabled' for the PentiumIII,
   'Hyper-Threading technology', 'Execute Disable protection', '64-bit support'
   and 'Virtualization Technology' for the Pentium 4, Core (2), Athlon 64 and
   later models.
  The Instruction set extensions line displays if MMX, 3DNow, SSE, SSE2, SSE3,
  SSSE3, SSE4.1, SSE4.2, and SSE4A support is present.
   Note that only supported instruction sets are displayed.
  For CPUs with split Data/Instruction L1 caches, the combined value is shown.
  On Multi-Core CPUs, the sizes of the L1 and L2 cache are indicated for each
  core and the number of caches per CPU package is indicated as well.
   Note that when a combined L2 cache is used by the CPU in question, the nbr
   of L2 caches present is less than the nbr of cores.
  A L3 cache, if present, is usually a single combined cache.

Switches can be combined. Example: CHKCPU /S /C gives a short display of
the CPU type only. The speed is not displayed.
The /D switch has priority over the /V switch, the /S switch has priority over
the /D and /V switches, the /F switch has priority over the /S, /D, and /V
switches, and the /H or /? switch has priority over all other switches.

CHKCPU /V under WinXP on my Athlon 64 box looks like:

 CPU Identification utility v1.20                 (c) 1997-2010 Jan Steunebrink
 ------------------------------------------------------------------------------
 CPU Vendor and Model: AMD Athlon 64 3000+-3800+ E3-rev.
 Internal CPU speed  : 2398.3 MHz  (using internal Time Stamp Counter)
 Clock Multiplier    : Available only in Real Mode!
 CPU-ID Vendor string: AuthenticAMD
 CPU-ID Name string  : AMD Athlon(tm) 64 Processor 3800+
 CPU-ID Signature    : 020FF0
 CPU Features        : Floating-Point Unit on chip  : Yes
                       Time Stamp Counter           : Yes
                       Cool'n'Quiet support         : Yes
                       Hyper-Threading Technology   : No
                       Execute Disable protection   : Yes
                       64-bit support               : Yes
                       Virtualization Technology    : No
 Instr set extensions: MMX, 3DNow!, SSE, SSE2, SSE3
 Current CPU mode    : Protected
 Internal (L1) cache : Enabled in Write-Back mode
 Size of L1 cache    : 128 KB
 Integrated L2 cache : 512 KB


CHKCPU recognizes any 386 or higher CPU, however detailed information can
only be displayed for CPUs which support the CPUID instruction or
Cyrix CPUs with Device Identification Register (DIR) support.
This covers some 486 and all 586/Pentium and higher CPUs.
CHKCPU recognizes CPUs from Intel, AMD, NexGen, Cyrix/IBM/TI, UMC, IDT, VIA,
Rise, Transmeta, and DMP.
If CHKCPU is run on a 386 or (non-Cyrix) 486 CPU without CPUID support,
the CPU will be indicated as a 'classic' 386 or 'classic' 486 and a shortened
display with only speed and (if present) cache information will follow.

On Cyrix CPUs, the CPUID instruction can be disabled via a CPU configuration
register. On some PCs the BIOS disables CPUID during boot-up. CHKCPU checks
for this condition and enables CPUID again. All other Cyrix CPU configuration
registers that CHKCPU uses are restored to their previous state.

On IDT and VIA CPUs, the CPUID Vendor string and Signature can be programmed
to any value. CHKCPU checks for this condition and temporarily disables this
programming to show the real Vendor string and Signature of these CPUs.
However, this check can only be done in 'Real mode' and is therefore skipped
if the CPU is in 'Virtual or Protected mode' (EMM386, Windows).


Clock multiplier and CPU speed
------------------------------
Since the Intel 486DX2 hit the market, most CPUs run internally faster
than externally.
The Internal CPU speed display indicates the true internal CPU clock speed.
The internal CPU clock speed = Bus clock X Clock multiplier.
The Bus clock is the speed of the motherboard clock.
On Pentium class CPUs, the clock multiplier is usually selectable in steps
of 0.5 (x1.5, x2, x2.5, x3 etc.).
Some CPUs have a fixed multiplier factor (Celeron, PentiumIII/4), and some
use fractional factors like x1.75 (K5) or x2.33 (Winchip-2A).
Modern CPUs (Athlon64/Pentium4) use whole numbers as multiplier factor.

Most CPUs provide data on which Clock multiplier setting they are running.
CHKCPU will display the Clock multiplier when available, and also
calculate and displays the Bus clock speed in this case.
Note that the classic Pentiums, like the Intel Pentium I, Pentium MMX, and
AMD K6 do not provide any clock multiplier data.

For Intel CPUs the internal speed equals the rating. So a Pentium 200 will
run internally at 200 MHz. (66.6 x 3)
For AMD, Cyrix, and Rise CPUs the internal speed can be lower than the PR
rating due newer and more efficient design.
For the K6-2 and later AMD CPUs upto 1400MHz, the internal speed equals the
rating but modern CPUs use a performance figure as rating.

CHKCPU measures the CPU speed by accurately timing the execution of a bunch of
slow 'Divide' instructions.
For Pentium class CPUs however, the internal Time Stamp Counter (TSC) is used
whenever possible to further improve the accuracy of the speed measurement.
A message behind the CPU speed display indicates if the TSC is used.
As using the TSC would crash the program when the CPU is in 'Virtual mode',
the CPU speed measurement switches back to the (less accurate) instruction
timing method when the CPU is not in 'Real or Protected mode'.


Internal (L1) cache mode
------------------------
CHKCPU detects if the internal (Level 1) cache is disabled or enabled.
If enabled, CHKCPU indicates if the cache operates in the Write-Through
(read only cache) or Write-Back (read and write cache) mode.
For the 486 CPU family, this information is derived from the CPU-ID signature.
For Cyrix 486/5x86 CPUs, Configuration Control Register #2 (C2h) bit 1 (WBAK
 - Write Back Cache Interface Pins Enable) supplies this information.

The Pentium and higher CPU families normally operate their L1 cache in
Write-Back mode. Exceptions are: the Nx586, the Intel Pentium 63/83 ODP (P24T)
and the Cyrix 6x86/6x86MX/MII.
The Nx586 has only Write-Through mode and is indicated as such.
The P24T can operate in either the Write-Through or Write-Back mode.
For this CPU, CHKCPU uses a special routine to detect the difference.
The Cyrix 6x86 series usually operates in Write-Back mode but can be switched
to Write-Through mode by enabling CR0 bit 29 (NW - No Write-back).
CHKCPU checks this bit and displays the L1 cache mode accordingly.
For all other Pentium class CPUs, CHKCPU assumes Write-Back mode.

Note that for both the Nx586 and the P24T the CPU needs to be in 'Real mode'
to be able to check the L1 cache mode.
This check is therefore skipped if these CPUs are not running in 'Real mode'.


Other display details
---------------------
The CPU-ID Name string is only displayed when supported by the CPU.
This name string is stored in the CPU and is usually programmed into the CPU
by the manufacturer or by the BIOS at boottime.


Error and Unknown messages
--------------------------
Although CHKCPU is a 16-bit DOS program, it has to use a lot of 32-bit
instructions to do its work so it needs to run on a 32-bit CPU.
If the program is run on a 16-bit CPU like the 8086/88, 80186/88, or 80286
you will see:
 ERROR: This program requires a 386 or higher CPU!
Note: If the /s or /f option is used, you only see: No 386+

If CHKCPU is unable to detect the CPU Vendor you get an "Unknown" indication.
If CHKCPU is unable to detect the CPU Model you'll see -Unknown model-.
"Unknown" indications are also possible if CHKCPU is unable to detect the
Clock Multiplier or L1 cache size.

If a Cyrix CPU is detected but no DIR support is found you get:
 Cyrix Device Id Regs: - DIR registers could not be found -
This is correct on the early Cx486 CPUs but most Cx486 and all Cx5x86 and
later Cyrix CPUs should support the Device Identification Registers.

On CPUs without CPUID support, CHKCPU will indicate:
 CPU-ID Vendor string: - No CPUID -
This is the case on 386 and most 486 CPUs, on the DMP Vortex86, and on
the Cyrix/IBM 5x86.


Acknowledgments
---------------
I could not have written this program without the hard work of these people:
- Christian Ludloff http://www.sandpile.org/ for his unsurpassed amount and
  detail of CPU information.
- Grzegorz Mazur http://grafi.ii.pw.edu.pl/gbm/x86/ for publishing the basic
  algorithms for CPU detection.
- Frank van Gilluwe, author of "The Undocumented PC" (second edition); still
  my favorite hardware book.
  The internal CPU speed detection routine according the instruction timing
  method is based on ideas from his book.


Feedback requested
------------------
If you encounter an "Unknown" message or if you have any questions regarding
this program, please send me an E-mail with your CPU details and
the CHKCPU /V and CHKCPU /D outputs.
You can use DOS's redirect and append functions to get the outputs in a file.
E.g. CHKCPU /V > MYCPU.TXT and CHKCPU /D >> MYCPU.TXT

J.Steunebrink@net.HCC.nl

------------------------------------------------------------------------------
Chkcpu revision history:

Version 1.20
09/09/2010
- Updated the CPU data for these new models:
  . AMD:
    - Opteron Six-Core 4162/4164/4170/4174/4176/4180/4184,
    - Opteron Quad-Core 4122/4130,
    - Phenom II X6 1055T/1090T-BE,
    - Athlon II X4 605e/610e/630/635/640,
    - Athlon II X3 405e/415e/435/440/445,
    - Athlon II X2 260u/215/240e/245(e)/250/255/260,
    - Athlon X2 5000+,
    - Phenom II X4 Mobile P920/N930/X920-BE,
    - Phenom II X3 Mobile P820/N830,
    - Phenom II X2 Mobile N620/X620-BE,
    - Turion II X2 Mobile P520/N530,
    - Turion II X2 Neo Mobile K625/K665,
    - Athlon II X2 Mobile P320/N330,
    - Athlon II Neo Mobile K125/K325,
    - Athlon V Mobile V105/V120.
  . Intel:
    - Xeon Octa-Core X6550/L7555/X7550/X7560, 
    - Xeon Six-Core W3680/L5638/L5640/E5645/X5650/X5660/X5680/E6540/
                    E7530/E7540/L7545/X7542,
    - Xeon Quad-Core X3480/W5590/L5609/L5618/L5630/E6510/E7520, 
    - Xeon Dual-Core E5503,
    - Core i7 Six-Core i7-970,
    - Core i7 Quad-Core i7-870S/875K/880,
    - Core i7 Quad-Core Mobile i7-740QM/840QM/940XM,
    - Core i7 Dual-Core Mobile i7-620M/660UE/660UM,
    - Core i5 Quad-Core i5-760,
    - Core i5 Dual-Core i5-655K/680,
    - Core i5 Dual-Core Mobile i5-430UM/450M/520E/520M/540UM/540M,
    - Core i3 Dual-Core i3-530/540/550/560,
    - Core i3 Dual-Core Mobile i3-330E/330UM/350M/370M,
    - Pentium Dual-Core E5500/E6700,
    - Pentium Dual-Core Mobile P6000/U5400,
    - Celeron Dual-Core E3500,
    - Celeron Dual-Core Mobile P4500/P4505/U3400,
    - Atom Dual-Core D525/N550, Atom D425/N455/N475/Z560.
- Removed the display for SSE5 support, because AMD dropped this function.

Version 1.19
04/04/2010
- Updated the CPU data for these new models:
  . AMD:
    - Opteron Twelve-Core 6164/6168/6172/6174/6176
    - Opteron Eight-Core 6124/6128/6134/6136
    - Phenom II X4 820/910/925/945/955/965/B93/B95,
    - Phenom II X3 B73/B75,
    - Phenom II X2 545/550/555/B53/B55,
    - Athlon II X4 635, Athlon II X3 440,
    - Athlon II X2 250u/260u/235/255/B22/B24,
    - Turion II X2 Mobile M540/M660,
    - Athlon II X2 Mobile M340,
    - Sempron Mobile M120.
  . Intel:
    - Xeon Quad/Six-Core E5620/E5630/E5640/X5667/X5670/X5677, 
    - Xeon Dual-Core L3406,
    - Core i7 Six-Core i7-980X,
    - Core i7 Quad-Core i7-860S/930/960,
    - Core i7 Dual-Core Mobile i7-610E/620LE/620(L)M/640(L)M,
    - Core i5 Quad-Core i5-750S,
    - Core i5 Dual-Core i5-650/660/661/670,
    - Core i5 Dual-Core Mobile i5-430M/520M/540M,
    - Core i3 Dual-Core i3-530/540,
    - Core i3 Dual-Core Mobile i3-330M/350M,
    - Core 2 Quad Q9505,
    - Pentium Dual-Core E2210/E6600/G6950,
    - Pentium Dual-Core Mobile T4300/T4400,
    - Celeron Dual-Core E3400/T3000/T3100/T3300,
    - Celeron 220,
    - Celeron Mobile M570,
    - Atom Dual-Core D510, Atom D410/N450/N470.
  . VIA:
    - Nano U1700/U2225/U2250.
- Fixed the Core i7 Quad Mobile 720QM/820QM/920XM detection.

Version 1.18
10/10/2009
- Updated the CPU data for new AMD Opteron Six-Core, Phenom II X4, Athlon II X4,
  Athlon II X3, Athlon II X2, Turion II X2 Ultra, Turion II X2, Turion X2 Ultra,
  Athlon II X2 Mobile, Turion Neo X2, Athlon Neo X2, and Sempron models,
  and new Intel Xeon Quad-Core, Core i7 Quad, Core i5 Quad, Core i7 Mobile,
  Pentium Dual-Core, Celeron Dual-Core, and Atom models.
- Corrected the AMD Opteron Six-Core recognition and improved support for
  Opteron Dual-Core models.
- Fixed the mobile AMD Athlon XP-M 2800+/3000+ (socket 754) detection.
- Fixed a display format bug in Verbose mode on 486 and early Pentium CPUs.

Version 1.17
07/07/2009
- Updated the CPU data for new AMD Opteron Six-Core, Opteron Quad-Core,
  Phenom II X4/X3, Phenom II X2, Athlon II X2, and Sempron models,
  new Intel Xeon 5500 series, Core i7 Quad, Core 2 Duo, Pentium Dual-Core,
  Atom, and Celeron models, and new VIA Nano models.
- Added logic to distinguish Dual-Core from Triple-Core from Quad-Core CPU
  models, which share the same CPU-ID signature.
- Added display of Enhanced Intel SpeedStep or AMD Cool'n'Quiet support.
- Combined the CPU Features display of Instruction set extensions like MMX,
  3DNow!, and SSE/SSE2/SSE3 into a single and separate display line.
- Added indication of SSSE3, SSE4.1, SSE4.2, SSE4A (AMD), and SSE5 (AMD)
  instruction set extension support.
- Added display of the number of L1 and L2 caches for multi-core CPUs.
- Updated the L3 cache data for Intel CPUs.
- Fixed a bug where a mobile AMD Athlon XP was detected as an AMD Sempron CPU.
- Fixed the too high speed reading on the Intel Core i7 and AMD Phenom CPUs
  when the TSC is not used (instruction timing method).
- Expanded the Debug display to show all levels of CPUID Functions 4 and 11
  (0Bh) for Intel CPUs.

Version 1.16
02/02/2009
- Updated the CPU data for new AMD Opteron Quad-Core, Phenom II X4, Phenom X3/X4,
  Athlon X2, Turion X2 Ultra, and Sempron models,
  and new Intel Xeon Quad/Six-core, Core i7 Quad, Core 2 Quad , Core 2 Duo,
  Atom Dual-Core, Pentium Dual-Core , and Celeron models.
- Improved L1/L2/L3 cache size detection on Intel CPUs.
- Added support for the DMP Vortex86SX/DX/MX CPUs.
- Fixed a bug in the detection of several Athlon MP, Duron, and Sempron socket A
  models. Note: This bug did not affect CPU model detection in Short mode.

Version 1.15
07/07/2008
- Expanded the CPU detection logic to include the Extended Model and Extended
  Family bits in the CPU-ID Signature. This change became necessary now most
  modern CPUs use these bits and to distinguish them from previous models
  with the same Base Family/Model signature.
- Added an Extended Family digit to the CPU Signature display. Together with the
  Ext. Model digit and the 4-digit base Type/Family/Model/Stepping indication,
  this now makes the CPU Signature a 6-digit display.
- Updated the CPU data for new AMD Opteron Single/Dual/Quad-core, Phenom X3/X4,
  Athlon 64 FX, Athlon 64 X2, Athlon 64 (Mobile), Turion 64 X2, Sempron (Mobile),
  and Intel Xeon Dual-Core, Xeon Quad-Core, Core 2 Duo (Mobile), Core 2 Quad,
  Pentium Dual-Core (Mobile), Celeron Dual-Core, Celeron M, Core 2 Solo,
  Core Duo, Core Solo, Atom, and VIA C7 models.
- Fixed the AMD Sempron detection on Rev. F models.
- Corrected the Hyper-Threading display on AMD Dual/Multi-core CPUs.
- Added logic to distinguish AMD Opteron CPUs from Athlon 64 (FX) models with
  the same CPU-ID signature.
- Added CPU core revision indication for all AMD K8 and K10 models.
- Added a 'Virtualization Technology' display to the CPU Features list.
  Indicates if a CPU supports the Virtual Machine extensions.
- Removed the 'AMD MMX extensions' and 'AMD 3DNow! extensions' display from the
  CPU Features list to make room for more interesting instruction set extensions. 
- Fixed the multiplier detection on AMD family 10h and 0Fh Rev. F (AM2) models.
- Cleaned up the Debug display by only showing IDT levels on IDT/VIA CPUs.

Version 1.14
08/08/2007
- Fixed the Intel Celeron M 410/420/430 detection (Yonah core).
- Fixed the Xeon Dual-Core 3040-3070 detection (Conroe core).
- Updated the CPU data for new AMD Athlon 64 (X2), Athlon 64 FX, Sempron,
  Turion 64 X2, and Intel Xeon Dual-Core, Xeon Quad-Core, Core 2 Duo (Mobile),
  Core 2 Quad, Celeron M, Core Solo, and Core Duo models.
- Added support for the Intel Celeron Processor 400 Sequence.
- Added an Extended model digit to the CPU Signature display.
- Added an 'Execute Disable protection' display which indicates if the CPU
  supports the Data Execution Prevention feature. Used by WinXP SP2 and Vista.
- Added support for displaying the L3 cache size on AMD CPUs.
- Added an /F switch to allow output of the CPU internal frequency only.
  This option can be used in scripts, to allow decision making based on speed.
- Fixed the too high speed reading on the Intel Core and Celeron M 400 series
  CPUs when the TSC is not used (instruction timing method).

Version 1.13
02/02/2007
- Updated the CPU data for new Intel Xeon Dual-Core, Core Duo, Pentium D,
  Pentium 4, Celeron D, Pentium M, and Celeron M models.
- Added support for the Intel Core 2 Duo and Core 2 Quad.
- Added logic to distinguish an Intel Xeon (Dual-Core) from a Core 2 Duo,
  Pentium D, or Pentium 4 model with the same CPUID signature.
- Improved support for old UMC 486 CPUs and fixed the too high CPU speed
  indication on these CPUs.
- Added a batch-file for easy use of the program.

Version 1.12
07/07/2006
- Updated the CPU data for new AMD Athlon 64, Athlon 64 X2, Sempron, and
  Intel Pentium M, Celeron D, Pentium 4, Pentium D, Xeon, and VIA C3 models.
- Added support for the Intel Core Solo/Duo and Transmeta Efficeon.
- Enabled SSE3 display for any CPU that supports SSE2.
- Corrected the Hyper-Threading display on Dual-Core CPUs.
- Improved support for old Cyrix/TI CPUs like the TI486DX4.
- Expanded the Debug display with results from various CPU tests in case
  CPUID is not supported.

Version 1.11
07/07/2005
- Updated the CPU data for new AMD Opteron, Athlon 64 (FX), Sempron, Turion,
  Intel Pentium M, Pentium 4, and Celeron D models.
- Added support for the Dual-Core AMD Opteron, Athlon 64 X2,
  and Intel Pentium D CPUs.
- Fixed a bug in the Hyper-Threading display.
- Added Hyper-Threading and SSE3 display for the Athlon 64.
- Added 64-bit support display for AMD Opteron, Athlon 64 (FX), Sempron,
  Turion, and Intel Celeron D, Pentium 4, and Pentium D CPUs.

Version 1.10
10/10/2004
- Long overdue Chkcpu revision ;-)
- Updated the CPU data for new AMD Opteron, Athlon 64 (FX), Athlon XP, Duron,
  Sempron, Intel Celeron, PentiumIII, Pentium M, Pentium 4, Celeron D, Xeon,
  and VIA C3 models.
- Added detection of the AMD Multi Processor platform. This allows correct
  differentiation between Athlon MP, Athlon XP, and Sempron models.
- Added Clock multiplier support for the AMD Opteron, Athlon 64 (FX), Intel 
  Pentium M, Celeron M, and VIA C3 Nehemiah core.
- Fixed the incorrect CPU features display on newer Pentium 4 models.
- Added CPU features display for SSE2, SSE3, and Hyper-Threading.
- Moved the Integrated L2 cache size display in Verbose mode to the bottom
  of the display, just below the L1 cache size.
- Added Integrated L2 cache display for the VIA C3.
- Added an Integrated L3 cache display for the Pentium 4.
- Changed the Debug mode display to only show CPUID levels relevant for the
  detected CPU.

Version 1.9
10/10/2002
- Updated the CPU data for new AMD Athlon, Duron, Intel Celeron, PentiumIII,
  Pentium 4, Celeron 4, and VIA C3 models.
- Fixed the incorrect multiplier indication on newer Pentium 4 and Athlon CPUs.
- Added a CPU-ID Name string display. If the CPU supports it, this function
  displays the CPU Name or Brand string as stored in the CPU.

Version 1.8
07/07/2001
- Updated the CPU data for new AMD K6-III+, Athlon, Duron, Intel Celeron,
  PentiumIII, and VIA models.
- Added support for the Pentium 4 and for Transmeta CPUs.
- Corrected the VIA Cyrix III detection (Samuel core).
- Added Clock multiplier support for the AMD Athlon, Duron, and VIA Cyrix III.
- Added a /C command-line switch for troubleshooting CHKCPU problems.
- Fixed a bug that caused floppy or sound problems or crashed Windows on PCs
  which use a specific Intel I/O chip and a Celeron/PentiumII/III CPU.
  This bug affected the Compaq Armada laptop series and several Dell laptop
  and desktop models.

Version 1.7
08/08/2000
- Updated the CPU data for new AMD K6-2+/III+, Athlon-E, Intel Celeron and
  PentiumIII-E models, and added support for the AMD Duron and CyrixIII (Joshua).
- Added a separate Clock multiplier display.
- If the Clock multiplier value is know, CHKCPU will display the Bus clock
  speed as well.
- Rewritten the Internal speed detection routine to improve the accuracy of
  the speed indication under Windows NT/2000.
- Added code to prevent Windows from switching tasks during speed measurement.
  This should prevent the occasional freak CPU speed readings under Windows.
- Added detection for L1 cache WB/WT mode on the Cyrix 6x86/M2 series.
  Previous versions of CHKCPU indicated the L1 cache mode of these CPUs
  always as Write-Back.
- Fixed the too high CPU speed indication on the Cyrix 486 and 6x86, and the
  too low indication on the Cyrix 5x86.
- Fixed a bug that crashed the program on a Cyrix 486.

Version 1.6
03/03/2000
- Updated the CPU data for new AMD K6-2, AMD Athlon, and Intel Celeron models,
  and added support for the Intel PentiumIII-E (Coppermine).
- Fixed the 45% too low speed reading on the AMD Athlon when the TSC is not
  used. (instruction timing method).
- Increased the accuracy of the CPU speed measurement for fast CPUs, like the
  AMD K6-2/III, Athlon, and Intel Celeron/PentiumII/III(-E).
- Rewritten the basic CPU detection algorithm for better detection of NexGen,
  Cyrix, and IDT CPUs. This algorithm works also in Virtual and Protected mode.
- Added support for 386 and (non-Cyrix) 486 CPUs which do not know the CPUID
  instruction. CHKCPU will no longer abort with an error on these CPUs.
- Fixed a bug that crashed CHKCPU in Real mode on a Nx586, and fixed
  the L1 cache mode detection on this CPU.
- Changed the logic for the command-line switches so that in case of an
  unrecognized option, the display defaults to the Short mode. In addition,
  the command-line switches will also work if the space between CHKCPU and
  the command-line switch, or between the switches, is omitted.
- The speed reading in Short mode is now rounded off and displayed in
  whole MHz.

Version 1.5
09/09/99
- Updated the CPU data for new AMD K6-2, Intel Celeron, PentiumIII, and
  IDT Winchip steppings, and added the AMD Athlon (K7).
- Fixed a bug where an IDT CPU was displayed as an "IDT Rise -Unknown model-".
- Added support for Command line switches. You can get a list with CHKCPU /?
- An Intel Celeron CPU is now indicated as such. CHKCPU v1.5 is able to
  differentiate between a PentiumII and a Celeron with the same signature.
- Moved the integrated L2 cache size display to the Verbose mode, because it
  is no longer required for visual differentiation between a PentiumII and
  a Celeron.
- Added display of various CPU features. (Verbose mode only)
- Added display of the L1 cache size. (Verbose mode only)

Version 1.4
04/04/99
- Updated the CPU data with the new AMD K6-2 (CXT-core), K6-III,
  Intel PentiumII/Celeron, and PentiumIII steppings.
- Added support for the Rise mP6 CPU.
- Added display of the amount of integrated L2 cache on the PentiumPro/II/III,
  AMD K6-III, and Cyrix M3 CPUs. For the Intel PentiumII an additional
  'Celeron or Celeron-A type' indication is added when appropriate.
- Rewritten the program so that it runs in (16-bit) Protected mode whenever a
  DOS Protected Mode Interface (DPMI) host is present. (Windows, OS/2, etc.)
  This improves the speed display accuracy in the DOS-box for all CPUs and in
  addition, under Windows 3.x/95/98 on the Pentium class CPUs, the internal
  Time Stamp Counter can now be used, just as in Real mode.
- Added display of the Current CPU mode: Real, Virtual, or Protected.

Version 1.3
12/12/98
- Updated the CPU data. The new AMD K6-2, IDT C6-2, and Intel PentiumII/
  Celeron/Xeon steppings are now supported.
- Added a new Internal speed detection routine for all CPUs that support the
  Pentium Time Stamp Counter. This results in a more accurate speed display,
  especially on non-Intel CPUs (only in Real mode).
- Made the program better usable under Windows by adding checks for
  protected mode before using 'restricted' instructions.
  This avoids triggering a General Protection Fault.
- Fixed a bug where the program was aborted by Windows if run on a 386
  or (non-Cyrix) 486 CPU without CPUID support.

Version 1.2
04/04/98
- Updated the CPU data. The new Pentium II 333 (Deschutes) is now supported.
- Fixed the Intel Pentium Pro detection. CHKCPU v1.1 indicated these CPUs as
  a "Cyrix -Unknown model-".

Version 1.1
02/02/98 First update.
- Updated the CPU data.
- Added CPU multiplication factor indication for the Cx486DX4 and AMD K5.
- Expanded the internal CPU speed display with a decimal.
- Updated the internal cache mode detection for early Cyrix/TI CPUs.
- Fixed the Intel Pentium 63/83 ODP (P24T) internal cache mode detection.
  CHKCPU v1.0 indicated the internal cache mode of the P24T always as WB.
  This is not correct as the P24T can also operate in WT mode.
  For this CPU, a routine has been added to detect the difference.

Version 1.0
12/12/97 First release.
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