Using my z80 in-circuit emulator, I confirmed that the disk controller bootstrap program was loading into memory. I researched the dip switches for the drive and determined that my dip switch socket was one place off. Moving the socket and resetting the dip switches, plus setting my terminal to 9600 b (for the left/corner serial port) - voila I am back in business.

I was able to boot N* DOS, a N* Turbo DOS, CP/M, etc.

Bill