Can I use a wide scsi drive on a narrow scsi bus?

[Gulliver]

Can I use wide scsi drive on a narrow scsi bus?
I want to connect my BlizzardPPC 603e+ to an ACARD AEC-7720UW plugged to an IDE drive. Is it possible to do it only by using a 68 to 50 pin male to male adapter?

Thanks in advance

[ElPolloDiabl]

No. You can use different speed SCSI though.

[tone007]

UW-SCSI devices can generally be used on old 50-pin SCSI interfaces with the proper adapters, but I've never seen it tried with one of these ACARD devices.  I'd give it a shot if I had one lying around.

[HammerD]

UW-SCSI devices can generally be used on old 50-pin SCSI interfaces with the proper adapters, but I've never seen it tried with one of these ACARD devices.  I'd give it a shot if I had one lying around.

Connected to my Cyberstorm PPC SCSI is:

IDE DRIVE connected to ACARD 7720UW (terminated) --> Yamaha 50 PIN SCSI CDRW with (68-50 pin adapter)  --> CS PPC SCSI  <-- Active Terminator.

At least that configuration works.

[Gulliver]

@HammerD

So you terminate both the ACARD (the Acard has built-in terminator?) and then at the other end of the scsi chain with a scsi active terminator.
Is this correct?

[Damion]

@HammerD

So you terminate both the ACARD (the Acard has built-in terminator?) and then at the other end of the scsi chain with a scsi active terminator.
Is this correct?

Exactly. Both jumpers on the Acard closed (termination and term power) and you should (theoretically) be set.

[Gulliver]

Thank you!

[Zac67]

Some wide devices require proper termination of the whole bus, which the narrow bus half is just terminating on the low byte - thus you need a 'half terminator' (often seen with SCA adapters) if the drive doesn't work right away. But most do.
If the ACARD has built-in termination it'll take care of that but needs to be at the end of the bus.

[Bamiga2002]

I'm using the same ACard on my BPPC scsi and an IDE drive, works good. The BPPC scsi just limits the HD speed but it's still fast enough for me.