Well, it's 1–0 to Nixdorf. I'm giving up on the idea of getting Windows 98 or 98 to work there. However, I did manage to get MS-DOS 6.22 working, so I burned the working DOS onto a CF card and also found 300 MB of interesting games. I put the M602 there and made it autoexec. Everything seemed to be working. Some games worked, but none of them had sound. I tinkered with the interrupt and address settings, but unfortunately I was not able to get it working. While tinkering with the sound, I unfortunately pressed the combination that suspends the PC to disk. It did it, but after turning it on again, it got stuck in recovery mode. I had to perform a hard power-off, and after that, DOS was unable to boot again. I have now made the CF card bootable and working again, which was a long process. After all that, I made an image of the whole prepared CF card to have a backup plan in case I mess something up. Now I can tinker with the sound and try again and again until the sound works.
Jan "Jenkings" Škoda - blog
Simplifying IT, Amplifying Knowledge