That might be be akin to my Amiga Computer days when I had three CPU’s in the one computer. A 68000 (16bit) , a 68030 (32 bit) and an Intel 80486 (chugg chugg). All modified to the max with double the standard memory and video capacity.
Amiga/Motorola side on Amiga DOS and Intel side on MS DOS + Win 3.1 ran simultaneously all in one case with one keyboard and one monitor. Each “side” had its own video card, own memory and own HDD. A keystroke combination (don’t recall what but like CTRL-Alt-Del) swapped between the two systems/"side" and some home brew logic switched the monitor between the two video cards.