Re: SCSI-IDE-CF Experiment

[David Wilson <mcs6502@gmail.com>]

On Sep 23, 12:16 pm, a2avia...@gmail.com wrote:
> The Apple SCSI cards tend to be able to find the first partition
> nearly any volume from any other SCSI card, regardless of partitioning
> scheme or lack there of.  The CF card mounting is in reality no
> different.
>
> I think this stems from the backwards compatibility of the Rev A & B
> ROMs and that they did not use Inside Mac V for their partitioning
> standard. But any drive formatted on an earlier SCSI card revision at
> least booted on the Rev. C and AHS SCSI.

Seems logical. After all, if you have a 20MB SCSI HDD (for example)
you really don't want to waste any space on a partition table. The HS
SCSI card can just read block zero and check for the magic number to
see if there is a valid Apple Partition Table. If not, just report the
raw disk size through the SmartPort interface (up to 2^24-1 blocks) or
ProDOS block interface (up to 2^16-1 blocks).