Interesting. The original Intel 8086/8088 (iAPX 86) manuals discussed multiple processors too. Can't wait for a Concurrent CP/M-86 "NET" version done with 74ALS/ALVT/LVT/LVX glue. ;) Or get really fancy by shoving all the glue into an FPGA.

https://archive.org/details/bitsavers_inteldataBrsManual_570...

Awesome 74xx/40xx series logic quick reference

https://www.mouser.com/catalog/supplier/library/pdf/STLogic....