miod wrote:But OS/2 1.x could run on a machine without an ABIOS - at least the version distributed by Microsoft. I am not sure IBM intended AIX 1 to be used on non-PS/2 machines.
It can. 1.2.1 was the first to ship with a separate install kernel (and boot disk) for ISA bus PCs. In fact the install can be run and completed on VPC6 but I never managed to get a full multi-user boot out of it afterward.