Q: How do I use my Iomega SCSI-based Zip Plus?

The system I was sent had no manual to the SCSI board. I need to know how to change the on-board termination, so I can use an external device. I also need to know where I can buy converters, and I'm not even really sure what I need.

I have a Zip Plus that supports SCSI and parallel. I'd like to hook it up, but it uses a 25-pin connection. The SCSI card has 2 jumperless jumpers, but that's all, unless I missed something. This is my first system with SCSI, so I'm not real sure about it all. yet.

A: You have a Symbios 8951 Ultra-2 SCSI controller. The connector is called a VHD connector (Very High Density connector.) You would need a connector to convert from that to the Zip drive's connector. Also, be aware the Symbios controller does not automatically terminate the high-order bits, so the external adapter needs to do this.

I not sure such a connector exists. (Good reason.) Be aware that, if you connect any non-ultra-2 device to an Ultra-2 card, everything on that card reverts to non-ultra-2 behavior. Unlike narrow vs. wide, there are electrical differences between Ultra and Ultra-2.

You be much better off adding a second SCSI card to your system. The cost of the adapter, and cost in your own time, will likely exceed the cost of a cheap ultra-narrow card.

Alternatively, you can get a SCSI card at any major computer store. I'd recommend a Buslogic (Mylex) card, or any card from the 1st or 2nd tier of Red Hat's Hardware Compatibility List.


You will need to modprobe or insmod the right driver, for Linux to be able to use the card. (Note that Red Hat does all SCSI drivers as modules.)

[Update a/o December 1999: For a Zip Plus drive, you would also need the IMM driver, described at http://en.tldp.org/HOWTO/ZIP-Drive-4.html#ss4.4 (and not the PPA driver required for most other Zip units). Note: The Iomega Zip Plus is designed to autoswitch between SCSI and parallel/Centronics operation, depending on what you connect it to, but has been reported to be very problematic in that regard.]