[Coco] Interesting problem with multi-pak and CC3 and OS9L2 / Nitros9

[John R. Hogerhuis]

Well it would be interesting to get feedback from the community. Coco 1,
coco 2, coco 3, mpi model number, whether upgraded and peek value. One of
my mpis gives a false positive for "upgraded" (126). The other gives 0 when
I think if I unupgraded it should be 255. This connected to a coco 3.

-- John.

On Tuesday, October 4, 2016, Robert Hermanek <rhermanek at centurytel.net>
wrote:

> Huh, I remember (now that it has been mentioned) the $FF90 test working
> for me.  Is it not universal?  Are there certain models of MPI where the
> test is inconclusive?  Or does it indicate another hardware issue with
> MPI?  Also, when it comes to coco + mpi + various carts, have you cleaned
> all of the tin contacts lately?  I know when my poor neglected coco3 goes
> six months with no company, and then I try to play super pitfall, the game
> doesn't like to load unless I clean things up a bit.
>
> -RobertH
>
> On 10/3/2016 11:01 PM, John R. Hogerhuis wrote:
>
>> Ok so I did some more testing... turns out I have another multipak, same
>> model # and it returns 0 when I peek at &hff90.
>>
>> So I don't think PEEK &HFF90 is reliable contrary to the test described at
>> Cloud9.
>>
>> Also, I didn't think to look before but the MPI that returns 126 on the
>> peek still has the warranty sticker over one of the case screws. I opened
>> it and as you might expect I don't see evidence of rework.
>>
>
>
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