Create a VAX CPU with FPGA?

9000> There are many "soft CPUs" around. I wonder how hard it is to 9000> create a soft VAX CPU core that can be load into an FPGA. Other 9000> than to design from scratch, I think it might be easier if we 9000> grab the VAX-11/780, 750, or 730 schematics, and throw them 9000> into an FPGA compiler. The 780 was implemented with TTL, the 9000> 750 with gate array, and 730 with AMD 2901. I think the 730 9000> scheme might be the easiest to implement with an FPGA. You'd also need the microcode. The schematics will only give you the micro-engine. The microcode is what turns that into a VAX. I suppose you could do a VAX in hardwired logic, but that would be HARD given the instruction set. A bit easier if you use the minimum subset, I suppose. paul