[Coco] KenTon RGB-DOS floppy issue

[Robert Gault]

Bill Gunshannon wrote:
>
> ________________________________________
> From: Coco [coco-bounces at maltedmedia.com] on behalf of Tom Seagrove [tjseagrove at writeme.com]
> Sent: Saturday, February 11, 2017 10:07 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] KenTon RGB-DOS floppy issue
>
> That is what I thought.
>
> On Feb 11, 2017, at 8:24 PM, Tim Fadden <t.fadden at cox.net> wrote:
>
>> On 2/11/2017 6:11 PM, Allen Huffman wrote:
>> I have a floppy controller in MPI slot 4 and a KenTon with RGB-DOS ROM in slot 3.
>>
>> With MPI set to 3, I boot and get RGB-DOS. But, typing DRIVE OFF does not access the physical floppy drive. It just hangs and times out with an IO ERROR.
>>
>> Does this sound familiar?
>>
>>
>>
> I thought the chip was supposed to be put in the floppy controller. No?
>
>
> ____________________________________________________
>
> As long as there is only one and the MPI is pointing at it, should it make a difference?
>
> bill
>

Yes, it will make a Big difference! You need a floppy controller to access floppy disks and the 
floppy controller will only work if the MPI gives access to $FF40-$FF5F by setting the low nibble to 
the required slot.

The Ken-Ton hard drive controller uses $FF74-$FF77 for scsi drives so that is not affected by the 
MPI slot select.

I can't find anything in the RGBDOS code for the Ken-Ton, that $FF7F is set for the floppy 
controller slot.

With my system, the RGBDOS ROM is in the floppy controller slot4 with the Ken-Ton controller in slot3.

Robert