I was wondering if you knew what limitations are imposed on a Toshiba Satellite 1800-100 when it comes to CPU upgrades. It’s currently equipped with a Celeron 800, that makes it a 100Mhz FSB coppermine compitable, but would it support a 1Ghz P3 coppermine? More? Less? Cache? Bios flash? And so on. Thanks for your time.

I’m getting this question over and over again. Unfortunately, laptops are not very upgradable computers. You can increase the memory size, install a faster and bigger hard drive, but you don’t have a lot of options on upgrading the CPU. I’ve been looking for this kind of information for months but didn’t find anything that I can trust. If you find any, please post it here so other people can benefit. I guess that laptop manufacturers do not provide any information on upgrading laptop CPUs. Just for fun I tried to install faster CPUs on some new Toshiba models, but it never worked for me.
I think that with Satellite 1800 you have a better chance on upgrading. I found that in Toshiba Satellite 1800 the same system board can handle 2 different CPUs: Pentium III 850MHz and Pentium III 1GHz, but for Celeron processor it has a different system board part number (might be the same board). The only way to find out is to try it, but I think that you understand the risk. This experiment might damage your laptop and you’ll get an expensive paper weight. Here’s a guide for replacing the CPU in Satellite 1805.