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Question about SCSI termination with Jaz Traveller adapter

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First post, by sangokushi

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Hello,

Recently bought an Iomega Jaz drive with Jaz Traveller adapter. The manual mentioned the SCSI termination of Jaz drive needs to be turned OFF when using with the Jaz Traveller.
https://www.minuszerodegrees.net/manuals/Iome … ion%20Guide.pdf

I thought the first and last device in SCSI bus need to have termination ON.
In this case, the Jaz Traveller (SCSI controller) is first device and Jaz drive is last device, just want to know why the Jaz drive termination needs to be OFF.
Thanks

Reply 1 of 3, by dionb

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It's to do with power. The parallel port can't supply enough to deliver termination power. And it appears the Jaz can't supply termination power either, so Iomega's solution was apparently to just not terminate 😦

See here: https://micha.freeshell.org/traveller/index.html

There's an example of a mod you could do to supply termpower from any device with suitably robust power delivery.

Reply 2 of 3, by auron

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i suppose another option would be to hook up a 2940 series or similar to the chain, which should always provide termpower. or just some hard drive jumpered to provide termpower and only spin up on command, so you don't get the noise...

Reply 3 of 3, by sangokushi

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Thanks all for the response!
I use the jaz drive to move files between computer, was hoping I can keep the terminator switch always ON.
I am going to buy an internal jaz drive for use with my desktop.

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