[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
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