[Coco] Broken CC3

[Gene Heskett]

On Friday 12 September 2008, George Ramsower wrote:
>----- Original Message -----
>From: "Gene Heskett"
>
>> On Friday 12 September 2008, George Ramsower wrote:
>>>Darn,
>>>
>>> My CNC coco broke.
>>>
>>> It starts up and displays the usual stuff. I can ?mem and it reports
>>>correctly. However, when I boot OS9, it crashes.
>>>
>>> I appears to crash when it loads the first boot sector.
>>>
>>>I tried other boot disks with the same results.
>>>I replaced the CPU, RAM board, reseated the GIME, polished the edge
>>>connector on the disk controller, reseated the ROM in the controller  and
>>>all gives the same results.
>>>
>>> Suggestions?
>>
>> This smells like a memory problem as os9 put it in all ram mode.  Perhaps
>> there is a problem with the memory above 32k?
>
> This is why I replaced the memory board from another coco. I was thinking
>the same thing.
> The re-seating of things was the first step, then the memory, then the CPU.
> I think the next thing to try is another GIME chip. I've never had one fail
>before.
> I think I'll try that now and see.
>
>George
>
Another thought George.  do you have any hardware that could exert an IRQ 
before it has been initialized to do so?

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
Mal: "You told me the entry couplings would hold for another week!"

Kaylee: "That was six months ago, cap'n."
				--"Serenity"