[Coco] 64K Coco mode and the MC6883

[Sean Conner]

It was thus said that the Great RETRO Innovations via Coco once stated:
> On 3/28/2023 3:21 PM, RETRO Innovations via Coco wrote:
> >That allowed me to filter out all reads of addresses with $df in them, 
> >as a write to $xxfd would be $00fd, where a read would be $01fd.
> 
> Argh....
> 
> A write to $xxdf would be $00df, whereas a read would be $01df
> 
> Anyway, I hope you got the point.

  I do, thank makes sense.  

  -spc