Correct jumper settings for SCSI HDD on an Apple LC 475

[SuperRey]

Hello,

I have been struggling with the jumper configuration for a 50-pin SCSI HDD.

The model is IBM DSAS-3540.

Of course, id, was set to 0, and internal terminator was enabled but it was not detected.

I have 3 more settings I can change with the jumpers:

• Disable auto spin up
• Disable unit attention
• Disable TI negotiation

I started disabling the TI negotiation, and now it seems to work.

The question is, should I disable the other two?

 

[beachycove]

I always jumper auto spin up on such drives.

 

[SuperRey]

I always jumper auto spin up on such drives.

Thanks! I will disable auto spin up and test if it still works as expected.

 

[beachycove]

Jumpering enables....

 

[bobo68]

Nope, in this case the three mentioned jumpers disable: http://keycorner.org/pub/text/doc/dsas3xxx.pdf

If it works I would not change anything.