[Coco] Upgraded MPIs and Harware incompatability

[Mark Marlette]

Bruce,

OK, that is what my thinking was on my original reply to you. The 
CoCo1/2 should be fine but the 3rd party plugin hardware used 
reserved areas of the memory map and thus where broken when the CoCo3 
started using those formerly reserved areas.

Thanks!!!

Mark

At 10/1/2006 09:59 AM, you wrote:

>The first suggestion of a PAL switcher to switch between CoCo 3 use and CoCo
>1/2 use seems to be Marty Goodman in The Rainbow on January 1987 starting on
>page 98.  Here he does not say that the upgraded pack does not work on CoCo
>1 &2s, but rather that some 3ed party hardware will not work with the
>upgraded MPI.  This is the earliest reference to a PAL switcher I have found
>so far.
>----------------------------------------------------------------------
>In CoCo Consultations, The Rainbow, April 1987 a PAL switcher is addressed.
>This one is a bit vague as to the reason for the need to revert to the old
>PAL for use with the CoCo 1/2
>----------------------------------------------------------------------------
>
>I don't have time to research this much further now.  Suffice to say there
>was some confusion as to the needs for the upgrade in the first place, and
>it's affect on older equipment.
>
>If Mark M. states the upgraded MPIs work fine with the CoCo 1 and 2, I can't
>argue it.
>
>Bruce W.
>
>
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