Here's one of my favorite Windows 98 systems:
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This is a Compaq Presario 5600i. Very similar to the 5670i my family had many years ago.
It's a Pentium II 350MHz (will upgrade to a 450 eventually), with 320MB of RAM (originally 128 I think), and the original IBM 10GB hard drive. It's very orginal; it has the original modem, video and sound cards, and the original DVD-ROM and Zip drive (which still works).
The video card is an ATi Rage Pro LT AGP with 8MB of video RAM. Actually not a bad card at all in my opinion for this machine. Half-Life, while not the smoothest, is very playable on this machine in its current configuration.
I got this machine off of eBay a little over a year ago, and was incredibly lucky to find one that still has the drive door in place, as they usually got broke off back then.
For purposes of originality, and because I'm determined, I actually have this machine set-up with Windows 98 First Edition (4.10.1998). It's pretty much worked fine on here, with a few minor issues, but nothing serious. I've never had any major problems out of Windows 98 FE myself.
Here's a screenshot from it:
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I have this machine connected to my ViewSonic VA192b 19" LCD monitor, running at a very comfortable 1280 x 1024.
Some other cool features of this machine is that is has on-board LAN and 1394! Pretty neat for such an old system.
These larger-case Compaq Presarios in this style seem to be very hard to find these days. They made smaller ones that look almost just like this on the front, and those seem to be a lot more common (I actually have one too, a model 5030 which I found in a dumpster). I sat them side-by-side once, and the size difference is quite huge.
I actually can't remember now if I've posted about this machine before or not, so apologies if I have.