I keep coming back to the old AMD AM2901 chip. There is a surprising amount of documentation out there including a document of making a floating point adder using this chip. If i can remember right was done for one model of PDP. The whole setup to make a cpu around the 2900 chipset itsn't to bad. AM2901 and AM2910 are not that hard to find nor are they expensive. The only chip that I haven't seen is AM2902 which is used to speed up math functions when multiple AM2901 chips are used. I recently read in a document how it can be used for value comparison. Which is handy.

I keep running in this loop. I could wire up a functional setup with these chips but that's a lot of wiring. I could learn how to program an FPGA with the circuit but, design software for that kind of chip is not intended for hobbyists. It's the same program for $70 chip or a $54,000 dollar chip. I could make a program to simulate the circuit but it really wouldn't simulate the parallelism of circuitry. Now I am adding I could design and have a pcb fabricated.

* sigh *