The story of NEC’s FPUs is interesting, but as is usually the case, something led me down this path. While looking through loads of old scrap boards I found a most curious arrangement, a board with a normal unassuming V30 processor, but right next to it was another 40-pin chip, a chip with a HUGE die lid labeled D9008D, dated similar to everything else, in the 1989-1991 range curiously copyrighted 85 86 and ’87. I pulled the chip (soldered in , of course) and it sat on my desk, for a year until I decide to open the lid on it, and what did it reveal? A die that most certainly was a floating point data path. This odd chip was an FPU, and an FPU that was directly connected to the V30 CPU.
Very interesting article about a very obscure topic.