[Coco] eBay MPI Heads Up (and how damage can be done)

[Stephen H. Fischer]

Hi,

The MPI upgrade usually has nothing to do with the switches. Are there switches for manual slot selection and CoCo 1/2 - 3?

> Just listed.  It's a grey 26-3024 that appears to be switch selectable for 
> use with a Coco 1,2/3.  Though the seller doesn't make that claim.

Marty may have done both the mod to make the MPI to work on the CoCo 3 AND also allow use on a CoCo 1/2.

Reading backward towards the beginning Rainbows  CoCo Consultations." may find it. The RTSI (Wow, I just realized that the Rainbow Text Searchable Index shares RTSI with ftp://www.rtsi.com/ ) gets no hits on " MPI " in the earlier Rainbows.

> But what I am talking about is a technical description on building Marty's 
> mod. It's out there. I think.

The good doctor's words in October 1991 are the definitive answer to MPI. and the CoCo 3.

Rainbow October 1988 page 58. That says just a small chip and some wires are needed for construction. 

But be sure to use Aaron's site for the OCT 1988 Rainbow, it has a schematic correction in blue ink. 

If it does not have the blue correction ask me. I got all the Rainbows in a Torrent and have them  on my 1TB NAS.

The colored wire may match Tandy's upgrade. Marty says that his previous instructions were then bad because Tandy changed the wire colors. 

If I try to zoom in the picture gets smaller. If I try to zoom out the picture gets smaller. Finally got it zoomed.

Marty's name is on it for sure. Why three IC's? That suggests to me that CoCo 3 and CoCo 1/2 operations are possible.

Remember, Marty's day job is putting people to sleep. Maybe he hit his arm instead of the patient when he did some of the MPI upgrade articles.

SHF


----- Original Message ----- 
From: "K. Pruitt" <pruittk at roadrunner.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Friday, May 29, 2015 6:03 PM
Subject: Re: [Coco] eBay MPI Heads Up (and how damage can be done)


> Hi Stephen,
> 
> Thanks for looking.
> 
> Yes, Marty's article is excellent. It actually came up recently in 
> conversation here on the list. It's a must read I think.
> 
> But what I am talking about is a technical description on building Marty's 
> mod. It's out there. I think.
> 
> I haven't searched yet. But it's the weekend so I have time to look around. 
> :)
> 
> 
> ----- Original Message ----- 
> From: "Stephen H. Fischer"
> Sent: Friday, May 29, 2015 6:01 PM
> Subject: Re: [Coco] eBay MPI Heads Up (and how damage can be done)
> 
> 
>> Then he goes on to say no damage will be done and suggests a very specific 
>> chips to replace the ones related to the MPI upgrade to reduce the 
>> possibility of damage. MPI = Multiple Problem Issues.
>>
>> Designers of new MPI replacements need to read the Good Doctors words 
>> three times at least and the previous words he has written (Issue in 
>> text.)
>>
>> Y-Cable builders should find the article in March 1992. I got a lot more 
>> hits on "Y Cable" finding that one.
>>
>> SHF
>>
>> ----- Original Message ----- 
>> From: "Stephen H. Fischer" <SFischer1 at Mindspring.com>
>> To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
>> Sent: Friday, May 29, 2015 5:13 PM
>> Subject: Re: [Coco] eBay MPI Heads Up (and how damage can be done)
>>
>>
>>> The Good mans work was found quickly using "Rainbow text searchable index 
>>> v1.pdf".
>>>
>>> Goodman, Marty. Upgrade Your Multi-Pak"; October 1991, p.052.
>>> Using the MPI with the CoCo 3.
>>>
>>> Marty explains why the upgrade is MANDATORY to use a MPI with a CoCo 3 
>>> and how damage can be done.
>>>
>>> SHF
>>>
> 
> 
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