operating systems kernel:

We'd gathered books and equipment to begin the port in 1989. Most critical was the Crawford and Gelsinger book.
We went through many PCs, most of them portables. Compaq sent a DeskPro 386, and SystemPro 386 & 486.

Choosing how far to go in supporting X86 architecture in order to get a basic BSD UNIX system to be able to bootstrap the futre efforts.

This article, last of the original three done altogether in 1990, on getting the critical pieces functioning independantly that we needed to do the port. Once these we obtained, the kernel was inevitable.

We describe the need and use of a cross-support environment to create 386 code from a non-386 machine, so as to create the initial binarys before our port can generate them.