Chris Lomont of lomont.org has obtained a batch of Hitachi 63C09EPs and is offering them up for sale at $20 a piece plus $8 shipping in the U.S. You can order them from his CoCo blog at http://www.lomont.org/Software/Misc/CoCo/
This is a great deal because these chips often go for $30 to $50 or more each! The 6309 is a replacement for the CoCo's 6809. The C version of the EP chip is perfect for pimping out a CoCo 3. This was the last revision of the part and can run at 3Mhz. (Although getting a CoCo to actually run at 3Mhz is a bit tricky, from what I've read so far.) The chip was also produced in A and B versions. This is a direct and fully compatible replacement chip for the Motorola 68B09EP that comes with the CoCo 3. The Hitachi part also includes optimizations and extra instructions that can speed up operation, with the right software, even without clocking the chip faster. NitrOS-9 even comes in a 6309 version. Serious soldering/desoldering skills are required to perform this upgrade.
Trivia: Did you know that Commodore made a 6809-based machine?!? Yup. The SuperPET 9000 was a duel processor machine that had both a MOS 6502 and a Motorola 6809 in the same box! Commodore almost got it right. ha!
Discuss this entry and its comments in The CoCo Hut Message Board!