The "Amiga ROM Kernel Reference" manuals were a set of books published by Addison-Wesley which detailed the Amiga operating system APIs, its data structures, purpose and architecture. Three editions were issued between 1985 and 1992. The complete set of the final edition would comprise the "Amiga ROM Kernel Reference Manual: Libraries", "Amiga ROM Kernel Reference Manual: Devices", "Amiga ROM Kernel Reference Manual: Libraries" and "Amiga ROM Kernel Reference Manual: Includes & Autodocs". The "Amiga Hardware Reference Manual, 3rd edition" and the "Amiga user interface style guide" were published at the same time but did not cover the same ground as the ""Amiga ROM Kernel Reference Manual" set.

What was always absent from the "Amiga ROM Kernel Reference Manual" set was good coverage of the AmigaDOS component of the Amiga operating system. While documentation was available as part of "The AmigaDOS Manual" (published by Bantam Books), it barely scratched the surface. The "Amiga ROM Kernel Reference: AmigaDOS" volume you quoted from was not written by the Amiga and Commodore developers, but by Amiga operating system software developer Thomas Richter, quite recently. It is based upon earlier research conducted by Amiga software developer Ralph Babel and others, filling in the many blank spaces which the "The AmigaDOS Manual" did not even address.

Note well that this volume is not to be mistaken for the "Amiga Hardware Reference Manual, 3rd edition".