[Coco] Un-upgraded 3124 Multipak/Coco3 Question

[Mark Marlette]

Mike,

I'm not even going to try to do the agree/disagree repeat.... :)

I stand corrected, you are correct.

Thanks for keeping me honest. :)

Mark

Quoting Mike Pepe <lamune at doki-doki.net>:

> Mark,
>
> I hate to disagree with you after you disagreed with my agreeing with
> you... ;)
>
> The 244's buffer the data bus from the RAM banks.
>
> The CPU is buffered from the data bus via a 245...
>
> ...but the general data bus goes right out the cart port. The GIME and
> MPI would indeed be duking it out if there's an addressing conflict.
>
> -Mike
>
> Mark Marlette wrote:
>> Mike,
>>
>> I hate to disagree with you after you agreed with me but.....
>>
>> That is not exactly true. The GIME is buffered by the 244's. The   
>> MPI is buffered by the 245, so those two would fight for the data   
>> bus.
>>
>> The GIME wouldn't be damaged the buffers possibly would be.
>>
>> Mark
>> Cloud-9
>> http://wwww.cloud9tech.com
>>
>> Quoting Mike Pepe <lamune at doki-doki.net>:
>>
>>> I second that. Essentially the MPI and the GIME chip will respond to
>>> the same addresses. Reading is probably the worse of the two in terms
>>> of potential damage, since the GIME and MPI will be driving the data
>>> bus at the same time. It could potentially kill the GIME. Not likely,
>>> but it is possible.
>>>
>>> -Mike
>>>
>>> Mark Marlette wrote:
>>>> David,
>>>>
>>>> The MPI and CoCo3's memory map conflict. Depending on what the    
>>>> program is accessing for addresses, depends on the damage or    
>>>> possible damage.
>>>>
>>>> It is a real issue and should be a concern to non upgraded CoCo3   
>>>> MPI owners.
>>>>
>>>> Mark
>>>>
>>>> Quoting David Grimmel <navydave1 at hotmail.com>:
>>>>
>>>>> I know I need to upgrade my white 3124 multi-pak to be 100% compatible
>>>>> with my Coco 3, but havent gotten around to it yet. While reading a
>>>>> Marty Goodman Q&A in the July 88 iss of Rainbow, he says, "even if your
>>>>> Coco 3 {appears} to work fine with your Multi-Pak, the upgrade is
>>>>> required. The upgrade may prevent slow, subtle damage to your Coco 3".
>>>>> I knew that using it un-upgraded my cause small glitches and software
>>>>> problems, but I didnt think it would cause any physical permanent
>>>>> damage. What damage is the good DR. referring to? Have I already
>>>>> damaged my Coco 3 by using it with an un-upgraded 3124 multi-pak?
>>>>>
>>>>> Dave
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
>>>>
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