thinkpad 600 266mmx unsolder onboard 32mb?

[thinkpadcollection]

Wondering if this can do this done this way by removing onboard 32mb memory so there is less complicated set up and less power usage this way?

I did search and there is many threads on undoing this via CMOS setting editor but these were for 600E and 600X, hardly little info on 600?

Cheers, Jason

[rkawakami]

I'm assuming that you want to disconnect the onboard 32MB of RAM because it is defective, yes? In which case, if you apply the hex edit to disable the base memory, I believe it will still be taking up some power (it logically disconnects the memory from the system, not physically). The power requirements of a 32MB PC66 SDRAM SODIMM was around 500mA (peak) when operating and about 150mA when idling (not in standby mode). This translates to about 1.65W operating and 0.5W idling. Assuming that a 35Wh battery will drive a 600 system for 2 hours, then I think the internal memory is worth about 4 or 5 minutes additional run time, if you're running the system 50% of the time (active vs. inactive).

Given that you will have to unsolder the RAM from the board, I don't know if it's worth it for the few minutes of run time. You could do some damage and then the system might be unbootable.

ref: http://www.kawakami-ca.com/ibm_600x/disable_memory/