[Coco] Question about MPI behavior
rhermanek at centurytel.net
Tue Apr 17 09:55:47 EDT 2012
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
>> if I then wanted to use the registers of the rs-232 pak itself, I'd have
>> 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.
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> Coco at maltedmedia.com
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