alex.freed.007@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.