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

[Robert Hermanek]

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.