EISA Specification 3.1
The most relevant of the patents was filed as "Bus master command protocol", but somehow ended up getting renamed to "Method for controlling disk array operations by receiving logical disk requests and translating the requests to multiple physical disk specific commands", now US Patent 5,249,279. The text includes an interesting statement: "The EISA specification Version 3.1 is incorporated as Appendix 1 to U.S. Pat. No. 5,101,492 to Schultz et al., and is hereby incorporated by reference". Further searching led to European Patent EP0426184 titled "Bus master command protocol", which does in fact include the entire 435-page EISA 3.1 specification as an appendix. The patent is long expired, the information within it is now in the public domain, so I took the liberty of extracting the appendix and making the EISA Specification version 3.1 available as a separate PDF. The scan quality is not great but the text is legible. I fixed up the PDF page numbers to correspond to the original document. This was made slightly complicated by the fact that there are several pages missing; page 173 in the PDF explains why - due to a misprint in an earlier edition, some pages were re-numbered and pages 173-180 no longer exist in the corrected edition. Note that the EISA specification, being a superset of ISA, also includes a specification of the ISA bus.