@David Kuder designed a SCSI device emulator with a Teensy 3.5 & NCR 5380:

Tiny SCSI Emulator

SCSI target emulator based on the Teensy 3.5 (Kinetis MK64FX MCU) and classic NCR 5380 SCSI PHY. Supports multiple targets (Device IDs), LUNs, and device types. 3.2″ x 1.6″ footprint, optionally uses or provides bus termination power. 64×48 pixel OLED status display.

The design files and source code are available on BitBucket:

tinyscsiemulator