[Coco] Broken CC3
gene.heskett at verizon.net
Fri Sep 12 09:53:58 EDT 2008
On Friday 12 September 2008, George Ramsower wrote:
>----- Original Message -----
>From: "Gene Heskett"
>> On Friday 12 September 2008, George Ramsower wrote:
>>> 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.
>> 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
> I think I'll try that now and see.
Another thought George. do you have any hardware that could exert an IRQ
before it has been initialized to do so?
"There are four boxes to be used in defense of liberty:
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-Ed Howdershelt (Author)
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