[Coco] question about MPI and Orch-90

Wed May 8 08:59:47 EDT 2013

> Ok I swapped out the chips.  Both say TANDY on them. And unfortunately I'm
> getting the same result with this alternate chip.  PEEK (&HFF90) still
> reports 255.  Perhaps the newer chip was just an newer version of the
> coco1/coco2 one.  Rogelio, I heard that the unmodded version on a coco3
> has memory conflicts that can result in crashes, data corrupt, etc. I want
> to get this working properly for coco3 and i have no equipment for
> coco1/coco2 anyways
>
> - Todd Wallace

Just buy a PAL from Cloud-9 and be done with it.  They really aren't
that expensive.

bill

>
> On May 7, 2013, at 10:53 AM, Rogelio Perea <os9dude at gmail.com> wrote:
>
>> My $0.02 is -> don't worry too much about which PAL is which, for most
>> practical purposes the un-upgraded MPI will work with the CoCo 3, it is
>> just so that properly fixing the PAL logic will make things tidy for use
>> with the CoCo 3. The details on what is affected and how are somewhere
>> within this list archives - this matter has been brought up before many
>> times: once you upgrade the MPI there are a couple of software/hardware
>> items that won't run if you use that MPI with a CoCo 1 or 2 (without
>> changing the PALs again).
>>
>> So, put the other PAL into the socket (mind chip's orientation though)
>> and
>> PEEK again at it - very likely the previous user/owner changed the PAL
>> to
>> the original one.
>>
>>
>> -- RP
>>
>>
>>
>>
>>
>> On Tue, May 7, 2013 at 10:32 AM, Todd Wallace <dragonbytes at cox.net>
>> wrote:
>>
>>> Update. I have opened the MPI and discovered a few things.  First,
>>> whoever
>>> modded this saved an alternate PAL chip stuck inside upside down as can
>>> be
>>> seen in this pic:   http://cl.ly/image/253N3V1v112c
>>>
>>> This second pic is the currently socketed PAL chip:
>>> http://cl.ly/image/2O0Y3o3p4716
>>>
>>> Hopefully u guys can read the number.  So the question is, which PAL
>>> chip
>>> is currently in there?  Is it the one for CoCo3? Perhaps the spare one
>>> stuck upside down in there is the one for the CoCo3?
>>>
>>> - Todd Wallace
>>>
>>> On May 7, 2013, at 10:10 AM, Todd Wallace <dragonbytes at cox.net> wrote:
>>>
>>>> Ok this is the weird thing.  This gray MPI TRS-80 Radioshack model
>>> 26-3024 has a sticker on the bottom that says CoCo3PAL.  On cloud9's
>>> website, they suggest the follow PEEK to see whether or not your MPI is
>>> modded for use on a CoCo3.  PRINT PEEK (&HFF90).  If the value is 126,
>>> its
>>> all set for CoCo3, if it is 255, then it is NOT modded for CoCo3.  My
>>> MPI
>>> returns 255 which baffles me because the sticker says "CoCo3 PAL".
>>> Anyone
>>> have any idea why there might be conflicting info? maybe someone modded
>>> it
>>> for coco3, and someone else UNmodded again? When i plugged it in, it
>>> seems
>>> to work.  I mean, i can select a slot, turn on the coco3, and it will
>>> load
>>> the appropriate cart.  I am a complete newb when it comes to MPI so any
>>> advice on how to test if its working properly or not would be
>>> gratefully
>>> appreciated.
>>>>
>>>> - Todd Wallace
>>>>
>>>> On May 6, 2013, at 11:30 PM, Luis Fernández <luis46coco at hotmail.com>
>>> wrote:
>>>>
>>>>>
>>>>> www.Cloud9tech.com sells a chip to repair and correct MPI addresses
>>> used
>>>>> to serve in coco3 and clash between different utilities
>>>>> not if specifically with Orchertra80
>>>>>
>>>>>> To: coco at maltedmedia.com
>>>>>> From: ooogalapasooo at aol.com
>>>>>> Date: Mon, 6 May 2013 22:42:13 -0400
>>>>>> Subject: Re: [Coco] question about MPI and Orch-90
>>>>>>
>>>>>>
>>>>>> Todd,1st, I don't think you can "hurt" the MPI is it doesn't have
>>>>>> the
>>> PAL fix, it just will not operate properly on a Coco 3. I know I'll be
>>> corrected on this if I'm wrong.
>>>>>>
>>>>>> On the Orch90 pak... to play the demo, you do not press "E", as that
>>> will put you in "Edit" mode.
>>>>>> Instead, you press "S" to "Score" the file for play. It will come
>>>>>> back
>>> to a cursor in a few moments and when it does, press "P" for play.
>>>>>> Any time you "Load" a new file or "Edit" a current file, you must
>>> press "S" before "P".
>>>>>>
>>>>>> Hope this helps.
>>>>>>
>>>>>> Bill Pierce
>>>>>> My Music from the Tandy/Radio Shack Color Computer 2 & 3
>>>>>> https://sites.google.com/site/dabarnstudio/
>>>>>> Co-Webmaster of The TRS-80 Color Computer Archive
>>>>>> http://www.colorcomputerarchive.com/
>>>>>> Co-Contributor, Co-Editor for CocoPedia
>>>>>> http://www.cocopedia.com/wiki/index.php/Main_Page
>>>>>> E-Mail: ooogalapasooo at aol.com
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Todd Wallace <dragonbytes at cox.net>
>>>>>> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
>>>>>> Sent: Mon, May 6, 2013 10:28 pm
>>>>>> Subject: [Coco] question about MPI and Orch-90
>>>>>>
>>>>>>
>>>>>> Hey all,
>>>>>>
>>>>>> I got my hands on a grey radio shack trs-80 26-3024 MPI.  There's a
>>> sticker on
>>>>>> the bottom that says CoC3 PAL, so I assume that means its been
>>> modified for use
>>>>>> with my CoCo3.  My question is, will plugging it in and turning it
>>>>>> on
>>> cause
>>>>>> damage of the mod is NOT in place?  I know theres a PEEK to check, I
>>> just don't
>>>>>> want to damage the coco3.
>>>>>>
>>>>>> My second question is, I got a cool Orch-90cc cart.  I plugged it in
>>> to try and
>>>>>> play the demo like the book suggests.  You press E [ENTER] and then
>>>>>> P
>>> [ENTER] to
>>>>>> play the demo.  but when i type P [ENTER], i just keep getting ERR
>>>>>> 04.
>>> Can
>>>>>> anyone help?  I don't know if i'm missing something or if theres
>>> something wrong
>>>>>> with the cart, etc. Any help is appreciated.  Thanks
>>>>>>
>>>>>> - Todd Wallace (LordDragon on Freenode)
>>>>>>
>>>>>> --
>>>>>> Coco mailing list
>>>>>> Coco at maltedmedia.com
>>>>>> http://five.pairlist.net/mailman/listinfo/coco
>>>>>>
>>>>>>
>>>>>>
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>>>>>> http://five.pairlist.net/mailman/listinfo/coco
>>>>>
>>>>>
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-- 
Bill Gunshannon          |  de-moc-ra-cy (di mok' ra see) n.  Three wolves
billg999 at cs.scranton.edu |  and a sheep voting on what's for dinner.
University of Scranton   |
Scranton, Pennsylvania   |         #include <std.disclaimer.h>