> On 02/21/2023 10:48 PM CST Eric Smith via cctalk <cctalk@classiccmp.org>
> wrote:
>
> Profile trivia:
>
> The firmware _inside_ the Profile is strange in that it doesn't actually
> KNOW the size of the Profile it's installed into. At power up, when the
> drive reads the home block, the drive size is stored there. That's done
> when the drive is formatted. There is different formatter firmware for 5MB
> and 10MB drives.
I think that was rather common with early SASI/SCSI controller boards that were
separate from the drive. My Ampro Little Board Plus docs talk about certain
controllers that saved the drive parameters in a reserved sector and some that
did not. I believe it couldn't boot from ones that did not. My guess would be
that Apple used separate controller boards and drives in the Profile. But
that's simply a guess.
Will
