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The Oberon book (by Wirth, updated in 2013) is excellent in that it describes the entire Oberon system, from the processor on up in a single volume.

https://people.inf.ethz.ch/wirth/ProjectOberon/PO.System.pdf

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For whatever reason, that PDF is incomplete. The ToC goes through Chapter 16, but the text includes only up to Chapter 9.

Part 2 is: https://people.inf.ethz.ch/wirth/ProjectOberon/PO.Applicatio...

Part 3 is: https://people.inf.ethz.ch/wirth/ProjectOberon/PO.Computer.p...

A fun point about the 3rd part. If you've ever been flummoxed by the basics of floating point math, part 3 discusses the fundamentals in 2 pages with a big fonts. One of the most succinct discussions I've seen on FP.

I can't seem to find the original 1992 edition in PDF. It feels like a lot of information (not just source code) is culled from the later versions (2005, 2013) of this book.

I have the hardcover version of the 1992 edition. AFAICS, the 2005 version that you can download from Prof Wirth's personal site is identical to the 1992 edition except that it has an additional appendix titled "Ten Years After: From Objects to Components"

https://people.inf.ethz.ch/wirth/

Yes, but I think it's an updated 2013 version and it also includes the specification of his "RISC5" (not RISC-V, btw) processor he designed just for the purpose of running Oberon on an FPGA

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