[Coco] grey MPI 26-3024 - how to tell if upgraded

[Ivan Browning]

I wondered that myself, but the mpi that i did upgrade didn't work on my
coco1.


On Sun, Feb 1, 2015 at 4:52 PM, RETRO Innovations <go4retro at go4retro.com>
wrote:

> On 2/1/2015 3:27 PM, Ivan Browning wrote:
>
>> PRINT PEEK(&HFF90)
>>
>> If it returns 126 it is upgraded if 255 not upgraded
>>
>> On Sun, Feb 1, 2015 at 1:58 PM, Randall Kindig <randall.kindig at gmail.com>
>> wrote:
>>
>>  I have a grey MPI (model # 26-3024) that I was told has been upgraded for
>>> a CoCo 3.  As a CoCo newbie, I’m wondering how I can tell for sure that
>>> it’s been upgraded?  Is there a PEEK or anything I can do software-wise
>>> to
>>> verify?
>>>
>>> Thanks all!
>>>
>>> Randy
>>>
>>>
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>>>  So, is there a link to a note that explains why the PAL changes were
> not backward compatible? As I understand it, the Coco3 MPI PAL allows
> addressing only ff7f, but the earlier MPIs would allow ghost locations.
> Why would disallowing the ghost make the unit not usable with Coco 1 and 2
> machines?
>
> JIm
>
>
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