IBM THINKPAD 600 Series laptop is a classic models in the period of P Ⅱ  (models which there are low-frequency CPU P Ⅲ), is still in the hands of many friends to Contribute its remaining energy, at the same time,at secondary market it is also one of the most common madels . There are three types of IBM 600 series,  600,600 E, 600X.
IBM THINKPAD 600 is used  the Pentium Ⅱ CPU with MMC1 package. Non-AGP feature, 66 MHz of the FSB, CPU can be upgraded to the highest Pentium Ⅱ 400.
THINKPAD 600E CPU Upgrade

WARNING: THIS POSTING CONTAINS INFORMATION ABOUT EDITING YOUR CMOS. THIS IS RISKY AND MAY CAUSE PERMANENT DAMAGE TO YOUR THINKPAD. I TAKE NO RESPONSIBILITY FOR ANY DAMAGE RESULTING FROM ANY OF THE INSTRUCTIONS LISTED HERE.

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When you boot, you get bios post error 127. Then you shoud do the following:

Choose “test”, choose “exit”, choose “config”, hit “ctrl-d”, opens bios hex-editor. Take cursor to position 20, key “02″ -> “0A”, hit “F2″, hit “esc”, choose “exit”, choose “ok”, and reboot.

Next boot should go without error-127

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Choose “test”, choose “exit”, choose “config”, hit “ctrl-d”, opens bios hex-editor.

So, in Sharedoc’s sequence, after I hit <CTRL>+D, I am in the built-in IBM ThinkPad BIOS hex editor: the screen changes to white text on black background and has a title: “System Configuration Edit Utility”.

The first screen showing has an orange text subtitle on the left: “Base 128 CMOS”. THAT is the screen where you want to make the single edit change. Pressing F7, F8, PgDn, or PgUp at that screen will take you to a different part of your CMOS/BIOS. Don’t press F7 or anything else except the arrow keys when the editor first shows up. You just want to work on the first page that opens up when you first hit <CTRL>+D.

It should look something like this, with a two-character-wide column under each hexadecimal character, and the background colour of the two-character columns alternate light blue and white backgrounds with black text on both. Each pair of XX’s below represents a hexadecimal value. The value at row 20 and column 0 on my ThinkPad 770Z and on Sharedoc’s 600E was originally 02 (and that’s a zero, not an “OH”). Here is a diagram indicating where this value should be located:

Code:

0 1 2 3 4 5 6 7 8 9 A B C D E F

00 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

10 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

20 ** XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

30 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

40 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

50 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

60 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

70 XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX

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Take cursor to position 20, key “02″ -> “0A”

You should be able to move the cursor immediately to the correct location using your arrow keys, just by pressing Arrow-Down twice. The cursor should then be at “02″ located where the two asterisks are in the diagram above. Change this “02″ to “0A”. To do this, simply type “0A” (again, that’s a zero, not an “OH”) and it should replace whatever is at your cursor. If your ThinkPad does not display “02″ at this location originally, then I wouldn’t touch it: either you are looking at the wrong location, or your BIOS is different than mine and Sharedoc’s.

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hit “F2″

Pressing F2 will save the change you just made and write it to the CMOS. Note that it is not F7, but F2, just at Sharedoc says.

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hit “esc”, choose “exit”, choose “ok”, and reboot.

<ESC> exits the System Configuration Edit Utility (Hex Editor).

Choose “Exit”, takes you out of the “Config” area and back to the main Easy-Setup screen

Here, I actually choose Restart, then OK, instead of the order Sharedoc describes. Hitting “Restart” then throws up a screen asking “OK?”. Then Hitting OK on that screen will reboot your machine with the changes.

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Next boot should go without error-127

Mine did exactly that. It rebooted without the 127 error, directly into Windows 98SE. And then the Powerleap utility enabled the L2 cache on startup.

The mod to force SpeedStep processor to start with higher frequency is a bit tricky and may not work for all processors and always. I have myself MMC2-PIII-700MHz processor in Thinkpad 600E which worked with the higher speed for about year but it stopped working with higher frequency after I tried the processor once in 600X motherboard with the mod inserted. After that 600X visit, the processor only works with the lower speed in 600E

Additionally, when this mod was ok, to activate higher frquency, it required booting the 600E with battery only (no charger connected). And booting to higher frequency succeeded only about one third of times. So it required usually to boot several times and every time to check with WCPUID program that if it booted at higher frequency. If not then just power-off and reboot until it came on at higher frequency.

After it booted with higher frequency, then the charger can be connected and it will stay at higher speed. However, the syspend to disk will not work (Fn – F4),

Remove the MMC2-processor module. Take a careful look at the back side. Locate Integrted circuit U63. It is the SpeedStep controller circuit with text “JAPAN 724661 02415″ (text upside down) on it. It is to the north from condenser C124. Follow the signal line from 4th pin from the low-right. This signal line goes towards text Y60 to the south. Cut this signal line with a knife just above the end-point where there is a pass-through to the upper side of the board. (I don’t know the exact terms, sorry. Anyway, pass-trough means that there is a drilled hole which is copper-filled, so that the signal can go through the printed circuit board to the upper side).

On the top level of the board this pass through meets a resistor, south from text C9. Solder to the west end of this resistor a 2.2kohm resistor, and solder the other end of the resistor to north end of condenser C13.

C13 is to west-north from text C9.

Put back the processor module. Make sure the added resistor does not touch anything.

Now boot with battery. Check the speed with WCPUID. Keep doing at least 10 times. It should boot up by that time with higher frequency if it likes to do so. Of it doesn’t the undo all the mods and report here. I would be interested to know if others had success.

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