My mistake -- what I wrote was from memory so I got the bit wrong about the multiplier ROM. I must have confused that detail with the design of the Wang 2200 computer, which had double precision BCD float math and did in fact have a 4b x 4b multiplier ROM.

https://www.wang2200.org/

(I'm the guy behind the wang2200.org domain)

Lovely page, I enjoyed it lots. Especially this: “The first time I programmed a computer was in the fall of 1978 at LTHS, Lyons Township High School, in La Grange, IL. It changed my life. For a long time I couldn't think of anything else but programming computers, and it hasn't yet completely worn off.” Calms me down and gives hope. I started feeling like losing the programming spark is just behind the corner more and more during the past decade (working for money), yet decade and some before that was so exhilarating. But now I think, you've started 20 years before I was born!