[Coco] Max number of floppy drives with DOS

[Robert Gault]

At $FF7F the ROM is controlled by %abcdxxxx and the MPI slot with %xxxxabcd. So valuesvalue               slot0                        11                        22                        34                        4
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  On Wed, May 19, 2021 at 10:58 AM, Arthur Flexser<flexser at fiu.edu> wrote:   On the CoCo 3, in the normal all--RAM mode, switching slots will switch the
ROM, but that wouldn't normally matter since the ROM isn't in the memory
map.  (By changing only one nybble (4 bits) of the MPI poke, you could
switch the disk controller slot/address without changing which slot's ROM
would be in the map if you switched to ROM mode.  I forget which nybble is
which.)

Art

On Wed, May 19, 2021 at 8:09 AM rietveld rietveld <rietveldh at hotmail.com>
wrote:

> I am using a 512k coco3. I am running HDB DOS in my first controller and
> RSDOS in the second.  I BOOT up with HDB DOS . I know that HDB DOS is not
> being written over by RSDOS after I software select (POKE) the other
> controller because the second set of drives are still using the 6ms step
> rate . Just to be sure I pulled the ROM from the FD500 and i can still
> access those drives
>
>
> Sent from my BlackBerry Key2
>
> From: farna at att.net
> Sent: May 19, 2021 7:34 AM
> To: coco at maltedmedia.com
> Reply to: coco at maltedmedia.com
> Subject: Re: [Coco] Max number of floppy drives with DOS
>
>
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