I have been working with (and having some since resolved troubles with) Tezro SCSI lately. The Tezro has a separate external SCSI bus coming off the back of the IO9 card, which uses a 68-pin "micro centronics" a.k.a. "VHDCI" connector.
In case anyone wanted to use external SCSI storage on their Tezro, here is an eBay source of new cables that adapts the VHDCI connector to regular HD68: https://www.ebay.com/itm/3ft-SCSI-5-VHDCI-0-8mm-to-SCSI-3-HPDB68-68-Pin-Male-Male-Cable-SC-413/271057453528 . From the same source as the famous "DIP switch 13W3 to VGA adapter."
In case anyone wanted to use external SCSI storage on their Tezro, here is an eBay source of new cables that adapts the VHDCI connector to regular HD68: https://www.ebay.com/itm/3ft-SCSI-5-VHDCI-0-8mm-to-SCSI-3-HPDB68-68-Pin-Male-Male-Cable-SC-413/271057453528 . From the same source as the famous "DIP switch 13W3 to VGA adapter."