I'll comment. Ave has two distinct systems listed on his web site and their interesting. I'm working on building one for portable(toteable) use. First I'd say I'm others. This is however my first real venture into the 68xx world though I'd looked at 6809 for a long time and have a COCO3 to play with. So I'm not near as comfortable with 6809 as many may be. What I've learned looking and working with the sim is that it's a very good cpu and somehow never got the populartity I'd have expected for the performance. Basic features: 6809 with a low chip count and despite the apparent low clock speed the CPU cycle usage is different (close to 6502) and operating speed is decently fast. Basic design (portable) is 48k ram and ROM resisdent OS. The resident OS can address up to 32mb of storage per logical device and the OS is sophisticated in that sparse files and scatter/gather are nominally part of it (like CP/M, unix, VMS). The OS is easily configured for any device (floppy, IDE, CF whatever). Same for IO (serial memory mapped video). One central item in my mind is that it's complete with supporting software such as editors, assemblers, languages and the sources are there. The documentation is good as well. Reading the manual gives depth to what I'm only outlining here. The outstanding feature if your interested at all, there's a good simulator for the hardware with matching software to play with, test drive if you will. The sim plays well on my P166 NT box, my W98 P100 and a dosbox. ;) Then I'd expect you'll find programming the '09 familiar. Allison