[Coco] [Color Computer] Re: Hitachi 6309 questions

[Mark Marlette]

As piggybacking **might** be safer, if it works for you GREAT but the address bus of the CoCo is NOT buffered.

The Pro-Tector+ buffers the address lines.

YMMV.

Regards,

Mark


----- Original Message -----
From: "Art Flexser" <flexser at fiu.edu>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Thursday, February 12, 2009 6:47:06 PM GMT -06:00 US/Canada Central
Subject: Re: [Coco] [Color Computer] Re: Hitachi 6309 questions

I think what Gene is suggesting is a bit too discouraging.  If you don't try to
salvage the 6809, but instead clip all the pins and remove them (heat while
GENTLY pulling) one by one, it doesn't take a soldering expert or a $130
soldering iron, just a reasonable degree of care.  But the piggybacking solution
someone suggested sounds easier and safer.  I see no reason to install a switch,
though, since the 6309 is pretty much entirely backwards compatible with the
6809.  So I'm guessing you'd just need to clip the one pin (whatever pin number
that is) of the 6809 and solder the corresponding pin of the 6309 to the remains
of the pin after doing the rest of the piggybacking.  

Art

On Thu, 12 Feb 2009, Gene Heskett wrote:

> On Thursday 12 February 2009, David Bush wrote:
> >Okay, thanks, but I would still like to know how to add a 6309 CPU to
> >my CoCo. Do I just remove the 6809 and drop in the 6309?
> 
> Essentially yes, but put a socket under it.
> >Is this 
> >something someone with minimal hardware experience should attempt?
> 
> No.  Hot soldering irons take the 'nak' to run well. I would practice on a lot 
> of throwaway stuff first.  And expect to pay around $130 for a decent temp 
> controlled iron.


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