I checked the specs when I got some parallel versions of the Zip250 I got that were mistakenly listed as SCSI on eBay. IOMEGA never made a SCSI Zip 250, internal or external, just parallel and USB for external and IDE for internal.

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They definately made a SCSI external 250. I had one until recently when I traded it to a comrade. (CC?)

The USB ones came in two flavors, the non-USB-powered ones that could also take a FireWire adapter and the (more common, at least on eBay) USB-powered ones.

Now, if you want obscure variants of the 250, try one for a Dell Latitude D-series laptop. The C-series are common as mud, but I'd never seen a D-series one until yesterday. (The OCD part of me wants one for completeness, but the logical part can't justify the price for something I'd hardly ever use.)