[Coco] 6809EP - Worth it?

[Darren A]

On 1/18/10, J.P. Samson  wrote:
> On Jan. 18, 2010, at 5:51 PM, Andrew wrote:
>> I was browsing around a favorite local electronics surplus haunt of
>> mine, and found that they had a cache of MC6809EP processors, in
>> tubes of 5 or 6. The condition of the parts looked NOS; but other
>> than that, unknown.
>
> I believe the CoCo used a 68B09E.  That 'B' indicates that it can
> operate at speeds up to 2 MHz.  A 68A09 runs at 1.5 MHz.  A plain 6809
> maxes out at 1 MHz.  I think the 'EP' refers to requiring an
> 'e'xternal clock and that it uses a 'p'lastic package.  So my concern
> is that these chips you have found could not operate in the CoCo at
> the speed required.
>

---

The CoCo 1 and 2 use the slower 6809E.  The CoCo 3 uses a 68B09E
because the CoCo 3 is gauranteed to run at 1.78 Mhz. You can also use
the B in a CoCo 1 or 2.

Jameco currently has the 68B09E in DIP-40 package listed at $4.95 for
singles and $4.49 in quantities of 10+.

Darren