So I currently have a P4 2.8 that I use for some more modern Win98/XP games, and a K6-2 for real mode DOS gaming (ISA AWE32, that's why)- I've been thinking of ways that I could stick both systems in the same case/tower, and have them share the same PSU, DVD drive and hard disk. I could use the same OS install on both systems, and only boot to DOS when using the K6-2, whereas I'd boot to a full Windows mode when using the P4. This would avoid any potential issues with drivers for different systems

Theoretically, I think it would be possible, here are some points I have considered:
[*]Both motherboards are ATX- I could possibly use a switch to select between powering motherboards A or B. DVD and hard drive would be powered on regardless of the mobo being used.
[*]IDE cables with 3 connectors- I could connect one end to the DVD/hard drive, and the other two ends on each mobo. This would obviously require a long enough cable and an IDE channel per device. I have not tested this but given that if you have two devices sharing the same cable, and one of them is powered off while the other is powered on, it still works, so this would work in theory as well.
[*]Use a tall tower- so that I can drill holes to fit the motherboard on the side panel and have them side by side, as long as no expansion cards are in the way.
[*]KVM for switching between VGA ports and mouse/keyboard inputs
[*]Duplicate the connectors for the power and reset switches plus HDD/power LEDs and speakear

Would love to hear some thoughts, even if you have not tried anything like this before. If you did, then I'd love to hear it even more 😀