[Coco] SuperComm v1.07 screen artifacts

Dave Philipsen dave at davebiz.com
Wed Aug 17 14:50:29 EDT 2016

Some people found that replacing the Motorola MC68B09EP CPU with a 
second source "AMI" brand CPU worked.  Another fix involved replacing 
caps C10 and C11 with 100pF caps and replacing R9 and R10 with 100-ohm 
resistors.  I do not know if the Hitachi 6809 or 6309 would produce the 
same results.  If I were you, I'd tried the cap/resistor fix first and 
see if that works.  These components are tied to the E and Q clock lines.


On 8/17/2016 11:01 AM, Barry Nelson wrote:
> It would be great if you could send me the details on any fix that does not involve replacing the GIME chip.
>> Dave Philipsen dave at davebiz.com
>> Wed Aug 17 10:02:22 EDT 2016
>> This is an old, old problem. I remember hearing about it back in the 80s and there were some fixes you could apply instead of swapping out the GIME chip. It requires some desoldering/soldering.
>> Dave Philipsen
>>> On Aug 17, 2016, at 12:12 AM, Barry Nelson <barry.nelson at amobiledevice.com> wrote:
>>> That looks exactly like what I see.
>>>> Travis Poppe travispoppe at gmail.com
>>>> Tue Aug 16 02:47:41 EDT 2016
>>>> You can see a bit of it here: https://goo.gl/photos/Z9yN1JapTXbsK2JFA

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