[Coco] Question about MPI behavior

[Robert Hermanek]

Anyone know why the MPI manual states that a drive controller must be in 
slot 4?  I would think with the POKE trick discussed here, a controller 
would work in any slot as long as you set the active I/O properly.

And that got me thinking about someone's previous post, asking if you can 
run more than one disk controller in a system, and we got into talking about 
changing I/O ports/etc.  If you had more than one disk controller in MPI, 
after booting the ROM in one as per normal, in slot 4 etc, what would stop 
you from using the $FF7F poke to switch your I/O to slot 3 and using the 
devices conencted to another disk controller?

I have no plans to do or test this, but someone was asking about multiple 
controllers a few days (weeks?) ago...

----- Original Message ----- 
From: "Darren A" <mechacoco at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Monday, April 16, 2012 7:28 PM
Subject: Re: [Coco] Question about MPI behavior


> On Mon, Apr 16, 2012 at 5:43 PM, Robert Hermanek wrote:
>> That was the problem, thanks so much. I'm not familiar with the $FF7F
>> control register, I'll have to look at the MPI manual for that. Sounds 
>> like
>> if I then wanted to use the registers of the rs-232 pak itself, I'd have 
>> to
>> POKE myself back to slot 1. Good to know!
>>
>
> The RS-232 pak hardware registers are not selected by the SCS* signal.
> They are fully decoded through the address lines and will always
> respond, regardless of the active slot.
>
> Darren
>
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