I bought three machines within a few months of each other in 1999, one a fairly low end, one middle, and one not exactly bleeding edge, but kind of a higher end machine.
As best as I recall, the specs were these:
The cheaper unit was a Pentium II, 400Mhz, probably a Celeron, 128 meg ram, I think about a 10GB hard drive, sound & video probably on the motherboard, CD-ROM player, Win98 OS.
The middle unit was a Pentium III, 550 Mhz, 128 MB ram, 100Mhz FSB, two 20GB hard drives, CD-R & CD-RW, DVD-ROM, mid-level video card, Zip drive, sound card, Ethernet NIC, speaker system with subwoofer and two satellites, 17” monitor, Win98 OS.
The slightly higher end unit was a Pentium III 675Mhz, 256 MB ram, 133Mhz FSB, two 20 GB hard drives, ATI Radeon video card (I think 32 MB ram) with a TV tuner (never did use the tuner), CD-R drive, CD-RW SCSI interface drive, 200 MB Zip drive, Ethernet NIC, 19” monitor, Win98 OS.
The middle unit was still in service until earlier this year, when the motherboard finally died, although I think I had upgraded the memory, video, and hard drives in the intervening years.