[Coco] eBay MPI Heads Up

[K. Pruitt]

Thanks Art.

The test reports 255 on both switch settings.  Cloud9tech says this means it 
is not upgraded.

Does this apply to Marty's mod?  I have no idea, but I am going to assume 
yes.

I think the mod may be in need of some TLC. Failing that, I may convert this 
old grey beast back in to a stock 26-3024 MPI.

----- Original Message ----- 
From: "Arthur Flexser"
Sent: Friday, May 29, 2015 5:18 PM
Subject: Re: [Coco] eBay MPI Heads Up


> I'd think the easiest would be to try it with a CoCo 3 and PEEK $FF90 with
> the switch in both positions.  The position that yields the correct value
> for a CoCo 3 modified MPI should be the CoCo 3 position.  Neither position
> should hurt the CoCo 3 if the mod is working correctly, though to be on 
> the
> safe side I'd turn off the CoCo and MPI before flipping the switch.  I
> vaguely recall that the CoCo 3 value of the peek should be zero, but I may
> be misremembering.
>
> Art
>
> On Fri, May 29, 2015 at 7:30 PM, K. Pruitt wrote:
>
>> Here's a picture of the innards.
>>
>> https://www.dropbox.com/s/i9xwgxtwwibbs6l/DSC01405.JPG?oref=e
>>
>> As suspected, it contains a mod to allow it to be used with a Coco 1/2 or
>> a Coco 3.
>>
>> The board was apparently manufactured by Marty Goodman as it has his name
>> on the board. Some of the traces show signs of repair.  I'll take a loop 
>> to
>> it later prior to testing. I have no clue as to which position of the
>> switch is which. But there may be detailed information about Marty's mod 
>> on
>> the Internet. I seem to recall seeing it somewhere. If not on the 'net 
>> then
>> in Rainbow.
>>
>> Thanks Bill.  Much appreciated.
>>
>>