Oooh I remember having one of these (with OS/2, no less) back when I had a side-job as the Microsoft support rep for Texas A&M. I was tasked with getting it up and working so I could demo it to the department heads who were looking to upgrade lots of old IBM XT's.
While DOS with Windows 286 worked okay, OS/2 for Mach20 never would get past installation.
I finally told my boss that I was getting nowhere with OS/2. She contacted her boss and later relayed to me that OS/2 for Mach20 had been marked as a "non functional product" and would be going away.
The happy ending was that I kept the Mach20 board in my ancient PC and used it for my remaining programming classes. It ran Turbo Pascal and QuickC for DOS quite well.
While DOS with Windows 286 worked okay, OS/2 for Mach20 never would get past installation.
I finally told my boss that I was getting nowhere with OS/2. She contacted her boss and later relayed to me that OS/2 for Mach20 had been marked as a "non functional product" and would be going away.
The happy ending was that I kept the Mach20 board in my ancient PC and used it for my remaining programming classes. It ran Turbo Pascal and QuickC for DOS quite well.