alex.freed.007{at}gmail.com wrote:

> All the used chips are widely available for pennies. The 6809
> is also still available at Jameco for about $5.

Sorry, I was mentally crossing that CPU up with the 6309.  If you find any of 
those for $5.00, please let me know before posting to the list? :-).

The 6309 is like a 6809 on steroids.  The electrical interface is the same, 
but when switched into its native mode, many instructions run in about 1/2 the 
clock cycles and a number of handy new ones are added.  A standard mod for 
CoCo's (just did it to mine) is to replace the stock CPU with a 63B09 and run 
a clone version of OS-9 (NitrOS9) that's been hotrodded to use the new mode.
--- SBBSecho 2.12-Win32