Porting Unix to the 386: A Practical Approach

William & Lynne Jolitz

Started open source UNIX.

Appeared in part as a 17 article magazine series in 1991-1992.

Documented the "how, what, why, who, when" of porting BSD to the 386.

Done while BSD was becoming "open source".

Porting Unix to the 386: A Practical Approach - clock interrupts

clock interrupts:

Introducing the Standalone System

Originally the test framework to prove kernel parts work in the environment of an protected mode program running on the "raw" machine, this became the bootstrap environment to later load and start the kernel in system operation.