WOW!! Now this is impressive!!
Many years ago I installed ZhaDoom and ran nothing else as it was the best PPC Doom available. I downloaded Adoom tonight to see how it fares on my A1200T. Well impressed. OK, admittedly, the ppc version runs slicker, but the 68k version is brilliant and is definitely playable. I'm going to fart around with loads of settings and see what I can get it to do!!!!
BTW - when I was running ZhaDoom w-a-y back in the 90s I got it running faster than my mate's Pentium 100!! I was using (virtually) the same set-up as now, but not towered: A1200 - 40+2Mb RAM - 540Mb HDD - 040/25 - 603ppc@160MHz