any building 6800 sbc's out there?

On Tue, Jun 17, 2008 at 1:08 PM, Henk Gooijen <henk.gooijen at hotmail.com> wrote: Not sure it's cheating... but my first major project while I was in the final year of my B.Eng (1995) was to design a 68HC11 based board - but still using the external address and data bus. External components on the bus were 2 8255's, and an EPROM, IIRC (I still have all the paper design files somewhere). I think the entire thing was hand routed. The thing saw production and maybe a hundred or so units were built, and I think some of those are still in use. I later implemented the same functionality with two PICs. That design was far cheaper, easier to build and more successful. I came to loathe the 8255. A design decision based on price and availability, causing endless headaches - IIRC a configuration change would reset the output buffers or some similar brain-dead behavior. I think these days educational 68HC11/12 SBC's are still easy to find on the used market. Engineering departments in universities and tech schools were flooded with those things... I have 2 M68HC12A4EVBs on my shelf that were retired from our undergrad program years ago. Yeah, not the same as wiring up your own DRAM, but still fun toys :-) Joe.