Ah, so that's why that was there. Remember wondering myself why would you depress it on my 486.
That came after the 386 mentioned
before, in '94 - 486 DX2 66 MHz, same 512k video card as the 386, 4 Mb RAM later upgraded to 8 Mb to play Warcraft 2, 540 Mb HDD. Had to keep using that till autumn of '98, put Win 95 on it too at some point, despite keeping being told that's no computer for '95. Well, it worked. CPU and motherboard fried 10 days after finally getting a new one, as parents had taken it to use themselves so I'd keep the new one as my own... That didn't last long. (No idea what happened to the 386, they took it to be "upgraded" to the 486 in '94, but other than perhaps the video card nothing of it was left so...)
Then in '98 came a Pentium II 266 MHz, S3 Virge 4 Mb video card, 32 Mb SDR 66 MHz RAM later (know it was on my birthday, but not sure whether in 2000 or 2001) upgraded to 64 Mb, 3.2 Gb HDD with a 20 Gb one added I think in late 2001. That was also the first computer I took apart, helped by someone, right after getting it, just take out and spread all components on desk and floor and then put it back together. It had a decently long life though, as after getting the new one my parents took it, and this time could keep using it, till I guess they also switched to the newer one when I left for Iasi in 2003, till I also had the computer brought there a year later, at which time they got themselves a new one and gave the PII, which I guess had just been lying around for that year, to some friends of theirs, so it was still in use. I for one kept it on Win 95 OSR2 all the time I used it, not sure if that changed after.
And that gets my "system history" to autumn of 2002 and likely way too recent for this thread :))