[Coco] Coco-3 power and MPI questions

[Brian Blake]

Everything I've ever read said to use the disk controller in slot 4....

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On Oct 1, 2014 5:13 PM, "Bill Pierce via Coco" <coco at maltedmedia.com> wrote:

>
> From what I understand, the reason to use slot #1 for the disk controller
> was "distance" and "timing". IIRC, the disk controller would "sometimes not
> work properly in any other slot due to critical timing required and the
> time it took the data to travel from point A to point B. Slot #1 is the
> first bus on the MPI therefore giving the controller the fastest bus
> speeds. It's the same reason that they suggest not to make y-cables over a
> certain length. Also it seems I remember seeing somewhere to put the disk
> controller first even on a y-cable (same reasons).
> It seems like I read this in a Marty Goodman article in Rainbow
> somewhere... or as an answer to a question in his question/answer column.
> I may be wrong, but that's the reason that seemes to come to mind when I
> saw the post.
>
>
> Bill Pierce
> "Today is a good day... I woke up" - Ritchie Havens
>
>
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>
>
>
> -----Original Message-----
> From: tim lindner <tlindner at macmess.org>
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Sent: Wed, Oct 1, 2014 12:03 pm
> Subject: Re: [Coco] Coco-3 power and MPI questions
>
>
> On Wed, Oct 1, 2014 at 8:55 AM, Kandur <k at qdv.pw> wrote:
> > Thanks Tim, is slot #1 'always on'?
>
> Well, that is kind of ambiguous question. All 4 ports are always on.
> If a device does full address decoding (not using SCS or CTS) it will
> respond.
>
> Plugging the floppy controller in the the back most slot (is it really
> labeled #1?) is more of a convention than a requirement.
>
> I can get you a schematic when I get home from work.
>
> --
> tim lindner
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