I have a few 74HCT612's on order. I need a MMU after all, just for kernal and
user space. Page Zero size is 512 bytes,
I have to write the new micro code to check if using pals as roms
works. With the MMU I may get 3 mhz, but this just ball park for now, with the chips
I am using.
After I get the schematic roughed out,I may just brute force the disign to 36
bits by adding a second 16 bit alu. I guess a 8"x10" card will fit chips, not sure about the
routing yet.

Ben, I see you have mentioned the Meta II Compiler Compiler in several different posts over the years. Could you describe the tool chain you are using with Meta II. How would you suggest someone new get the tools to do some development/experimenting for bootstrapping a homebrew system? Thanks! Michael

Meta II, is a nice concept but it mostly a string processor. It can't handle local variables or data types.
a = b + c; becomes lea 'a' push ld 'b' push ld 'c' add store
A good intro is here
https://www.bayfronttechnologies.com/mc_tutorial.html
Ben.
Are you bootstrapping 16 bit code?
Small C is 16 bit. DosBOX-X works well for that.