[m463]

I thought it was pretty cool when they had a pci(?) card you could add to a PC that could run VM/SP

[fredoralive]

The later generation mainframe-in-a-PC cards were PCI, but they’d also done MCA and ISA ones, going back to the XT/370.

The XT/370 is particularly bonkers, as it uses a combo of a 68000 and an 8087 with custom microcode in them to run System 370 code.