[Coco] Back to the COCO

[Arthur Flexser]

A bad CPU can be the cause of all sorts of weird problems on the CoCo,
including problems relating to floppy I/O.  I'd try replacing that, since
the chip is relatively cheap.  Unfortunately, it is soldered in, so you'd
want to install a socket.
Not too difficult if you use the destructive method of clipping the pins on
the old CPU and desoldering them one by one, rather than trying to remove
the old chip intact.

Art

On Sun, Jan 1, 2017 at 8:53 PM, Bill Gunshannon <bill.gunshannon at hotmail.com
> wrote:

> On 1/1/17 7:44 PM, Robert Gault wrote:
>
>> Bill Gunshannon wrote:
>>
>>> <snip>
>>> Thanks for the suggestions, some further comments.  Disk drives work on
>>> other vintage machines and PC's so I don't think it's the drives.
>>> <snip>
>>>
>> And, as stated, exact same symptom trying to do hard disks using the
>> Glenside and SCSI controller.
>>
>>> <snip>
>>> bill
>>>
>>>
>>>
>>>
>> Bill,
>>
>> Given that your Coco3 works with HDBDOS for Drivewire, the drives work
>> with other computers, and you have problems with hard drive controllers
>> on the Coco, the problem would seem to be within the Coco3.
>> These types of hardware problems are very difficult to handle even for
>> electronics tinkerers. You can try cleaning the Coco rompack port
>> connectors but that is a long shot. You will need suggestions from our
>> hardware experts.
>>
>>
> Actually, it may have just become moot.  My 3 has stopped running at
> all.  No display, nothing but the click of the relay when you power
> it on.  I have moved some of my testing to a 2 but that isn't where
> I really want to be so I may be giving up.  I looked on ebay and it
> looks like COCO3's don't show up there any more at least not in a
> search.
>
> The good news was the SUPERIDE seems to work just fine.  I am DSKINIing
> 255 virtual disks right now.  I will try putting NitrOS9 on it and see
> if it works. But that will require finding a version that actually boots
> on a 2 from Drivewire and I have not found one in any of the stuff that
> is currently available.
>
> If things continue in the direction they seem to be going I may be
> looking to dump all that I have.  :-(
>
> bill
>
>
>
>
>
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