It's not surprising that the PS/2 model 80 would have MS-DOS games compatibility problems, even if running PC-DOS or MS-DOS rather than OS/2. The Model 80 was

It's not surprising that the PS/2 model 80 would have MS-DOS games compatibility problems, even if running PC-DOS or MS-DOS rather than OS/2. The Model 80 was one of the first-gen PS/2 systems (which tried to replace the original IBM PC's fairly open industry standard architecture with things like MCA). IIRC the Model 80 was also IBM's first '386 PC, though IBM had been beaten to the '386 PC (first by Compaq and Advanced Logic Research, IIRC). Also, for a long time, MS-DOS games didn't necessarily work out of the box even on more conventional PCs, and you might have to mess with drivers, IRQs, etc.