[Coco] Vcc and real floppy disks

[Tim Fadden]

Not to be confused with a flippy! As the rotation is different!  With 
the rsdos controller I have, under rsdos 1 drive is drive0 on top, and 
drive2 on the bottom the second drive is drive1 on top, and drive 3 on 
the bottom.  Under OS9, the the drives work as normal double sided disks.

Tim

Darren A wrote:
> I think the problem that Robert was referring to is when a modified
> DECB is used to access the second side of a disk as though it were a
> separate disk. In this case the ID fields on both sides are encoded as
> side zero.
>
> For this scenario you need to use different values for the "phead" and
> "head" fields of the FD_READ_WRITE_PARAMS structure when accessing the
> second side of the disk (the "phead" field should be 1 and "head"
> should be 0). With a true double sided disk under OS9 these two fields
> should always be the same.
>
> Darren
>
> ------
> On 9/26/08, Joe F <joef6809 at gmail.com> wrote:
>   
>> Darren just saw your post,
>> your right fdrawcmd lets you pick the side of the disk, right now I'm just
>> forwarding the side select from the WD1773 chip so if you have an os like
>> OS9 or a DECB that been modified to use the second side that should
>> definitely work. I just never thought of over-riding that so standard BASIC
>> would work like that.
>>     
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco
>
>