Re: Zip Chip programming info / disk image?

[Linards Ticmanis <ticmanis@gmx.de>]

Jorge Chamorro Bieling wrote:

> > > > -loop to wait for data coming from the disk (*).
> > > Doesn't have to be exact, as long as it's not too *slow*.
> > ...except if the program in question is a nibble copier -- in that case
> > speed does matter.
>
> I thought this loop just keeps waiting for the msb bit to be set in the
> read register. 
> The problem with a processor that is too fast is that the loop may end
> before the disk data got into the read register ?

No... usually the loop runs forever, until data is there.

> Does a nibble copier read from the disk in a different way ?

Yes... it counts iterations of this loop to determine which bytes are 
sync bytes. If the loop runs far more often than is normal, this 
detection won't work,

--
Linards Ticmanis