The RF72 is controlled by a 68000/16 CPU. In have the impression that DEC liked the 68000 CPU on I/O devices. Beside the HSD10 having a 286 CPU. The TK50 Controller a 80186.
It may be true (liking 68K), I don't know. I worked in Storage since 1981, and all of the storage controllers I was familiar with in the early 80's used a 2901 bit-slice (with dual sequencers, so that one thread handled the Host I/O, while the other did the disk I/O). Specifically: RC25, UDA50, KDA50, KDB50, KDM70, HSC50, HSC70. [Maybe the HSC had an MPU doing stuff like console I/O??? Don't remember...] The next generation of high-end controllers (HSZ and HSG series, etc.) used PowerPC chips.The RF72 is controlled by a 68000/16 CPU. In have the impression that DEC liked the 68000 CPU on I/O devices. Beside the HSD10 having a 286 CPU. The TK50 Controller a 80186.
RQDX is also a T-11.DELUA unibus ethernet controller (single hex board follow on to the two hex board DEUNA) uses an MC68000 as the controller CPU. The DEUNA used a T11.
Ah, interesting, I had my HSD05 open and I assumed it was the same as my HSD10 just without cache.The HSD05 uses a 286 CPU, in particular a Harris CS80C286-20.
The HSD10 uses an LSI Logic LR33310MC-33 CPU, with a MIPS R3000 compatible core.