On Jul 24, 2004, at 04:00 am, Gregg Eshelman wrote:
--- Robert Kehrer <[EMAIL PROTECTED]> wrote:
FWB made the Jackhammer line of NuBus SCSI cards that supported Wide SCSI. ATTO made the SE-II narrow SCSI, SE-IV with wide and narrow SCSI and the SE-4D that was differential SCSI.
ATTO also did the SiliconExpress IV (SE-IV) which was Fast 50-pin (10MB/s) and Fast & Wide 68-pin (20MB/s). I have one in my 840av hooked up to a 18GB half-height (1.6") 18GB Seagate Cheetah 80-pin drive, via an adapter board. Works well enough to make the computer feel several years newer!
AFAIK, nothing newer than Wide or Wide/Differential SCSI was done on a NuBus card. These two have 2x the maximum transfer rate of Fast SCSI 2 because they move 16 bits at a time instead of 8 bits.
However, you can still adapt SCSI-3 to Wide SCSI and it will transfer at Wide SCSI speed. Differential SCSI controllers should only be used with Differential drives. You can adapt Low Voltage Differential drives to Single Ended, most LVD drives will automatically sense when connected to an SE bus or they have a jumper to force them to SE mode.
There might be adapters to connect SE or LVD drives to a Differential controller, but the cost of the adaptors would make it too expensive. OTOH, adapting an SCA80 SE or SE compatable LVD drive can be done for around $7 for an adaptor with both narrow and wide connectors. I have a Seagate 18.2gig 7200RPM LVD drive jumpered to SE mode on my Radius 81/110 and it works fine.
I don't quite get what the difference between 'Differential' and 'LVD' is. Are you referring to HVD or something similar?
Another way to attack it is to use whatever adapter is required (80-pin or 68-pin to 50-pin) and attach it to the internal SCSI bus. However I have problems with Quantum drives that have been pulled off Dell and Compaq servers, they seem to not like working in Apple machines through the onboard bus at all. Similarly re-cycled Seagate drives however seem to work fine.
-- Mark Benson
AIM - SilValleyPirate MSN - [EMAIL PROTECTED] Visit FlatPackMacs online: <http://fpm.68kmac.com> Visit my Homepage: <http://homepage.mac.com/markbenson>
"Never send a human to do a machine's job."
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