|While I wouldn't discourage you from learning more about hardware with that machine, there are some cold-hard facts you need to consider (and I had mentioned this on your previous post):|
1. Parts availability
As you've already found out, finding 30-pin or 72-pin RAM that would work is becoming increasingly difficult as these systems age. Virtually no one manufactures these anymore, and (as with small-size hard drives), we're at the end of the "bathtub curve" on pricing of these components (i.e.---those who do have them can charge a premium price, since they're now becoming so rare). "Maxxing-out" such a machine can become very expensive, very quickly.
As systems age, both power-supplies and electrolytic capacitors are prone to failure. Unless you're comfortable with component-level repairs, failures such as these can put a quick end to a system. If you have important data on such a machine, it could easily be lost to such failures. Backing up to optical-media would be virtually impossible, given the slowness of the system; and the rare tape-drives and Zip drives that could have worked are now notoriously unreliable as well. Yes, these machines may be fun to tinker with, but I'd never trust one with anything important.
While I have over 100 machines that either pre-date or are approximately the same age as yours, the simple fact is that there is little that can be done with those systems, compared to those that have been available for the last 5 years or so---the oldest machine that I routinely use is an 866MHz Dell OptiPlex---now over 11 years old. The maximum memory your machine apparently can handle is 36MB. No BIOS update will allow it to do more (and even finding an update would also be near impossible, given that AST exited the market in 2001---years after being acquired by Samsung). MS-DOS wouldn't recognize anything more than 64MB, and after around 32MB, most DOS-based systems actually were negatively affected by more memory. A CPU upgrade would be possible (maybe even up to 133MHz), but given even that, the most recent version of a Microsoft-based OS that would run with any degree of speed would be Windows '95 (now almost 17-years old)---and even finding a CPU upgrade that would work would be tremendously more difficult than finding RAM. Most very old software is of little practical use, and there are work-arounds (such as DOSbox and VM) to implement most of them anyway.
"Channeling the spirit of jboy..."