See above, the Fastpath uses separate chips for all the listed functions, no fancy integrated stuff. They are in essence full 68000 based computers without a video output. Also realize these bridges cost $1500-2000 new back in the late 80s-early 90s.

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Yeah, I noticed that after I posted. I was actually thinking of the smaller-cheaper "Printer adapters" (Ala, AsanteTalk, Farallon iPrint LT, etc) rather than the more heavy duty iron when I said it, but of course that last generation of those which came out in the late 90's-early '00s may well use MCUs that are (effectively) more powerful than the 68000 in the earlier "smarter" ones.