Disabling on-board 600E RAM

[TomStearns]

I ran across an article on speeding up the 600E thru use of P111 processor which included a link to a site that teaches how to diable the on-board RAM which is too slow for P111. THat link is now out-of-date.

Can anybody tell me how to disable the 66MHz on-board RAM?

[Rick Aguinaldo]

http://forum.thinkpads.com/viewtopic.php?t=7427

[pkiff]

or maybe here:
http://www.xabk.co.uk/
(Mod the Pad)

Under the "mods" page you'll find:

Error 127 is cause because the BIOS does not know how to initialise the Level II cache on PIIIs. Get into the setup menus and click CONFIG, once there hold ctrl-d to open up a hidden hex editor. From here we can disable the Level II cache routines altogether. Move to b yte 20 and change the value of 02 to 0A. Hit F2 to save the change then power off the ThinkPad. It is important that you power off, a reboot does not apply the change. You will now be able to boot without the error 127.

Note: Some people have experienced instability after upgrading to PIII CPUs caused by the onboard RAM. When you install a PIII CPU you automatically increase the FSB to 100MHz which can be too high for the 66MHz specification memory. You can disable it in the same manner as the Level II cache by setting byte 2B from its original value of 80 to 81.

Anytime you use the Initialize function in the Easy Setup utility will undo these changes and they will need to be reapplied.

Disclaimer:
I've not tried this particular BIOS/CMOS edit and cannot say for sure if it will work or if it is safe. Use at your own risk!...And let us know if it works!

Phil.