SWTPC 6809 systems

Jeff Hellige and I just finished about a 5 hour working (playing?) session on our SWTPC 6809 systems. His system works great but lacked disk drives. We did manage to boot Smoke Signal Broadcasting DOS on his machine once we swapped disk controller cards and first properly set a couple of baud rate jumpers. My system had problems booting DOS and then had trouble even running until I swapped out the 6809 CPU card with another. I still can't boot DOS however. Both my CPU cards are missing a 74189 RAM chip, whereas Jeff's has it. It's not clear that that is the problem, but is a starting place. I have managed to boot DOS in the past with this RAM-less scenario, but the system always seems to work sparingly. Anyway that's a brief recap of today's fun and seemed to be list-worthy to boot (ah-geez another bad pun :). Next time we're planning on Osborne's and CP/M. Eric