I'm going to call this complete for now: one Power Macintosh 7300/200, quad-bootable into Mac OS 8.1, BeOS Release 5, MkLinux ("My Kind of Linux" per one of the maintainers) pre-R2, and Microsoft Windows 3.1. Since the PC Compatibility card ☠️ that final one is a bit of a cheat using SoftWindows.

One thing that is made very clear using era-specific hardware: MkLinux is so.... slow... OTOH, BeOS rips. It's so smooth.

@jcgraybill what about Mac OS X?
@Random_Seed It looks like that might be possible, using XPostFacto... okay, intriguing. I'll give it a try. https://web.archive.org/web/20021017214107/https://eshop.macsales.com/OSXCenter/XPostFacto/Framework.cfm
Other World Computing: OS X for Legacy Macs

@jcgraybill yeah I’ve done it before. You may need a G3 upgrade for some versions for Mac OS X. I believe version 4 was the latest and is still on OWC’s website.

https://eshop.macsales.com/OSXCenter/XPostFacto/Framework.cfm?page=XPostFacto.html

Other World Computing: OS X for Legacy Macs

Upgrade the RAM and storage of nearly any Apple computer at MacSales.com. We also provide refurbished Macs, external storage, docks, accessories, and more!

@jcgraybill I’d also run MacosX Server 1.2 which is basically rhapsody before OSX 10.0 was released. That’s really fast even on PPC 601s and has more of a conventional Unix underbelly.

@Random_Seed Yeah I do consider the “rhapsody” releases different enough that it’s fun to run them too.

My goal is to be able to “soft” switch between OS’s, so it’s about finding the teensy bit of hardware overlap between what BeOS will accept and what OSX will require. I think that means I can’t use the G3 card, but I should be able to get OS 9.1, Server, and at least 10.1 squeezed in there.

@jcgraybill Nice. All running on stock. If you haven’t already done so, I’d add a L2 cache dimm and interleave the memory for better performance. I wonder how much a 1meg L2 cache will speed things up.