Date   : Tue, 21 Dec 2010 10:31:10 +0000
From   : afra@... (Phill Harvey-Smith)
Subject: Harddisc fakery using a microcontroller - back

paul aslin wrote:
> I kind of agree, I have need for sasi/MFM emulator instead,
> however....
> 
> Actually a new 'incompatable' IDE bridge would have a use, as copying
> from A Winchester to IDE drive currently requires a 3rd file system
> in the middle. That is IDE->1mhz
> bus->[econet/CPFS/RAMfs/anything]->1mhz bus->SASI->MFM All because
> the IDE and original SASI versions of ADFS cannot co exist in the
> same machine*.

However if the IDE interfaced onto the SASI/SCSI bus then asuming that 
ADFS supports multiple drives on SASI/SCSI, you could just use ADFS to 
copy between the two ? As long as the IDE drive was addressed in the 
same way as the CF & DataCentre boards*, then there shouldn't be a 
problem with then using it on one of them.

* From what I remember the 256 bytes of ADFS data is written to the 512 
byte sector to alternate bytes 0,2,4,6,8....

This is what I am currently working with, I have it actually working (on 
a PC SCSI bus with 512 byte sectors, but I don't see 256 being a 
problem), I'm just trying to optimize it to improve the rather poor 
speed :( Hopefully a combination of code optimizations and a faster 
clock for the AVR will help......If that doesn't improve things enough 
well then it's off to ARM land I go :)

Cheers.

Phill.