[Coco] DW4 Nitros9 and floppy disk access

[Walter]

Arthur

POKE &HFF7F,&H23 did the trick.  I can now use both the miniFLASH (HDB-DOS) and the FD-502 floppy controller.

And guess what guys!

I got the crazy Chinon floppy drive working!

I transferred the nitros9 dmode utility to my OS9 Lvl2 boot floppy and after booting displayed the setting for /d0

I then booted into nitros9 on Drivewire and output the settings for /d0

The difference was the stepping value.  On OS9 Lvl II it was set to 0 on Nitros9 it was set to 3.  After setting stp to zero 
I can use the Chinon drive as well.

Walter

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Arthur Flexser
Sent: Monday, 14 January 2019 3:54 AM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] DW4 Nitros9 and floppy disk access

The MPI slot setting can indeed be changed with software.  Location $FF7F
controls this.  The values are $00, $11, $22, and $33 to set the slot to 1
to 4.  You also can set the two nybbles separately, though my memory is a
bit hazy on what each does.  One hex digit (set to 0-3) selects which slot
contains the ROM that is looked at.  The other selects what the SCS line
controls, I think, so that if you are doing pokes that affect the hardware
of a cartridge in one of the slots, like an RS232 Pak, that slot could be a
different one than the one that the ROM is being read from if you set $FF7F
correctly.

Art

On Sun, Jan 13, 2019 at 9:13 AM Walter <zambotti at iinet.net.au> wrote:

>
> However I'm not sure I like changing the MPI selector while it is on!
>
> Is there a way I can do this via software?
>
>
>

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