In the 1980s I helped design a "one gate delay MMU" for the Atari ST. It gave you relocation and bounds checking in two directions ("text" going up from zero, s

In the 1980s I helped design a "one gate delay MMU" for the Atari ST. It gave you relocation and bounds checking in two directions ("text" going up from zero, stack going down from infinity) in power-of-two-size increments, and we fit it into the existing DRAM controller path and timing. Never had a chance to do a Unix port to the ST, but it would have been fun to use that hardware.