[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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