[Coco] OT: 63B09

Louis Ciotti lciotti1 at gmail.com
Sat Oct 29 17:25:55 EDT 2011

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.

I don't have any persoal experience with MCUs of this vintage, and since the COCO uses a similar MCU I thought I would ask here.

Sent from my Palm Pre on AT&T
On Oct 29, 2011 4:42 PM, gene heskett <gheskett at wdtv.com> wrote: 

On Saturday, October 29, 2011 04:40:56 PM Louis Ciotti did opine:

> I can across an NTE6809 processor and thought I would give it a try as a

> replacement for the 63b09.  It has an identical Pinot so I figured it

> may work.  I plug it in the socket, and I get nothing at all.  The

> external clock (4mhz) crystal does not even work, which on the one I am

> trying to replace does.  Is the IC bad, or is it a compatibility issue.


For the coco, you need to one with the xxx09E designation, indicating it 

uses an external clock and crystal.

> On Thursday, October 20, 2011, Louis Ciotti <lciotti1 at gmail.com> wrote:

> > Off topic, but since the CoCo uses 6809s, figured someone on here

> > might


> know about this.


> > I have a radio controller from circa late 80s that uses a 63B09 that I


> think may be bad.  What can I use in its place and is there a source?


> > The problem I am seeing is RN6(Pins 24-31) has some "noise" on the

> > line


> and the waveform is not exactly square like the rest of the data lines

> when observed with an oscilloscope.



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Cheers, Gene


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