[Coco] OT: 63B09

[john dumas]

On 10/29/2011 5:37 PM, gene heskett wrote:
> On Saturday, October 29, 2011 06:09:27 PM Louis Ciotti did opine:
>
>> The processor is not for the COCO. I am debugging a radio
>> controller that has a 63B09P in it. I found a ?NTE6809 which has
>> the exact same  Pinout, but the crystal does not oscillate when I
>> insert it into the MCU socket, but The old one does. I am
>> wondering if this means the NTE6809 is DOA. It was NOS in the bag
>> when I got it. 
>>
>> I need to know if the problem is a compatibility issue between the
>> NTE6809 and the HD63B09P or is it just that the NTE6809 is bad.
>
> Well, an ordinary 6809 is rated I believe a PMOS tehcnology version rated
> for a 1 Mhz clock, the B version, which your about 10 years newer Hitachi
> CMOS is, is rated at 2Mhz.  I have a C version, rated at 3Mhz in my coco,
> and from the waveforms I can read external to the chip, I get the
> impression it could run quite a bit faster than 3Mhz.
The MOT versions were all NMOS Depletion-Load design. The "A" and "B" 
versions
were simply the same die graded out for speed.

I can't imagine anyone redesigning the '09 for PMOS!
That was "previous technology" at the time of the '09 design.

This is from the best of my memory; I was a member of the MPU
design group while the '09 was designed........

cheers,
johnd

-- 
One useless man is a shame, two are a law firm, three is Congress.