[Coco] Kip's Single Board Computer

[Darren A]

On Mon, Sep 7, 2015 at 12:18 AM, RETRO Innovations wrote:

> Kip, working on debugging your 8 IC SBC, and I have a question:
>
>  * The CPU on this board is a 62C09P, which it appears will run up to
>    3MHz, but you've installed a 7.37MH Crystal on the board. Was that
>    by design?  Am I missing something (like the 6309/6809 divides the
>    clock by some value?)
>
> Otherwise, I think this SBC is not going to work unless we put a slower
> crystal in the design.
>



The 6309 works just like the 6809 (non-E versions). They divide the
frequency on the EXTAL pin by four to get the bus frequency (E and Q).

- Darren