[Coco] eBay 6309 chips

John Strong johnstrong at hotmail.com
Sat Apr 19 00:59:45 EDT 2014


Indeed 6809 chips are more precious than they used to be, but so is the pc board you are removing they from.


If want to try to salvage them without investing in the "proper" tools here is a couple of tricks I have used in the past.


Before unsoldering add a bit of solder (Radio Shack's is OK)to each pin. Typically your solder will have a lower melting point than the solder used on the pc board.  The new solder will mix with the old lowering its melting point.

Next use a "pro" quality desoldering wick (not RadioShacks or use a liquid flux with it) and remove as much solder as possible.

Sometimes this is all that will be need. Use the desoldering iron if necessary, overheating can damage the chip and/or the pc board. A lifted pc trace is permanent damage, while a 6809 can still be replaced.


Good luck.

John Strong



 > Message: 8
> Date: Fri, 18 Apr 2014 23:39:58 -0400
> From: "Kip Koon" <computerdoc at sc.rr.com>
> Subject: Re: [Coco] eBay 6309 chips
> To: "'CoCoList for Color Computer Enthusiasts'" <coco at maltedmedia.com>
> Message-ID: <001901cf5b81$09740160$1c5c0420$@sc.rr.com>
> Content-Type: text/plain; charset="us-ascii"
> Hi Chester!
> How are you going to remove the old 6809 chips from your Cocos? Are you
> going to desolder them in what I would call a proper manner or are you going
> to destroy them by cutting the pins? I've heard people cut their 6809s out
> to make it easier to desolder the pins left behind which I can certainly
> understand. I just can't see destroying a perfectly good 6809 chip since
> they are becoming quite precious these days. I too want to upgrade all my
> Cocos as well. I just have not been able to perfect my desoldering
> techniques. The tip on my desoldering iron from Radio Shack is a bit too
> big to perform the job properly. 
> I want to put all my 6x09 microprocessors in sockets as well. Until the new
> 6309 microprocessors are tested, then obviously their condition is unknown.
> If the pins on the 6809 are cut and the new 6309 is bad then the Coco is
> down for the count and temporarily out of the picture. That is a risk I'm
> not willing to take. Besides, I just don't like destroying fully functional
> chips - that is unless they are Fritos Scoops! ;D 
> Please don't take my thoughts in a bad way. I'm just trying to figure out
> how best to accomplish my upgrades so I guess I'm thinking out loud. That's
> something I do a lot. I seem to think much better if I think out loud or
> write down my thoughts in letters or emails. Anyway, the 6809 to 6309
> upgrade situation has been on my mind for quite a while now. I do hope that
> your 6309 upgrades on all your Cocos goes successfully and without any
> intermediate problems. Take care my friend. 
> Kip
> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
> Behalf Of Chester Patterson
> Sent: Friday, April 18, 2014 8:56 PM
> To: 'CoCoList for Color Computer Enthusiasts'
> Subject: [Coco] eBay 6309 chips
> Hi. I'm going to pop the 6809s on my Cocos and put in 6309s.
> I am looking to buy some 6309 IC's on eBay. The ones I'm looking at are at
> http://www.ebay.com/itm/181103857635
> Is there any experience on the list with this seller/these chips?
> Suggestions? Recommendations?
> Thanks much.
> Chester
> Costa Rica
> Come for the beaches! Stay for the beer!


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