I just found out about UNIXBOOT.COM. I wonder what exactly does it do. See https://ps1stuff.wordpress.com/download/downloads-for-model-2121/

I don’t have the PS/1 anymore, it was too heavy to fly out to Asia with, so I don’t know. Xenix didn’t like it, OS/2 didn’t like it, neither did BSD or Linux.

It’s not PC/AT compatible.

It seems that DISK03.SYS was added in OS/2 1.1, probably for the model 30-286. Assuming that the PS/1 model 2011 used the same type of floppy and hard drive, this support might be only a matter of patching the boot code.

The 30s I used had 30mb disks so, it really didn’t matter. But back then, the only 16bit version of OS/2 u had was 1.3 extended. I never used the sql, or the comms manager

PS/2 Model 30-286 is supported by OS/2 version 1.1. Of course you will need 2 megabytes of memory installed. Booting from an OS/2 1.0 diskette is not a good idea.

I am talking about the floppy controller mode. “PS/2 model 30” mode refers to the original 8086-based model 30. I am not sure which mode the model 30-286 uses.

having used both, I can tell you that is 100% wrong. The PS/2 model 30 ran OS/2 1.3 just fine. The PS/1 wouldn’t boot OS/2 at all.

I just read the original PS/1 technical reference. It says that the floppy controller is in PS/2 model 30 mode, which I doubt OS/2 can support. The 2121 seems to use standard IDE hard drives and was shipped in an OS/2 2.0 configuration by IBM.

Wonderful! 😀

got it to work! finally!