The specs for my 'retro' PC were:
Processor: AMD-K6 300MHz
Memory: 128Mb RAM
Graphics card: ATI 3D Rage Pro AGP 2X
Sound card: ?
OS: Windows 98 (First Edition, I think)
Monitor: Compaq V500 14" CRT
I also appear to have noted that after a bit of testing, I removed the ATI (??Mb) card and replaced it with my Voodoo 3 (16Mb) card, with 'much better' results. I also toyed around with the default DirectX5, later updating it to DirectX7. It seems that I didn't have much success with any of the Jane's Longbow games though, and for that reason, I sold it on.