ZuluSCSI is a SCSI computer storage emulation platform, which speaks both SCSI-1 and SCSI-2. It uses file-based SCSI HDD & CD-ROM images, similar to RaSCSI and BlueSCSI. It represents a fusion of firmware and concepts from both SCSI2SD V6 and BlueSCSI. Hard drive and CD-ROM drive images are stored on a standard FAT32 or exFAT-formatted SD card.

Features

• Emulates up to 7 SCSI devices simultaneously, including CD-ROM
• Speaks both SCSI-1 and SCSI-2
• SCSI Termination is DIP-switch controlled
• Firmware upgrade simplicity; As easy as placing a file on the SD card.
• Highly configurable using a text-based ini file, azulscsi.ini
• External LED pin header for attaching remote LEDs.
• Designed to be powered via SCSI termination power, when provided by the host
• Optional DB25 pin header for direct installation of an external SCSI connector, in addition to the Single-Ended 50 pin IDC connector
• Identical dimensions and mounting holes as that of SCSI2SD V5.1, V5.2, and V6, making it compatible with many existing SCSI2SD-specific mounting solutions
• 74LVTH125 SCSI bus transceivers, as used in SCSI2SD V5 and SCSI2SD V6 Rev F

Firmware structure

• SCSI command implementations are from SCSI2SD
• SCSI physical layer code is mostly custom, with some inspiration from BlueSCSI
• Image file access is derived from BlueSCSI

Major changes from BlueSCSI and SCSI2SD

• Separation of platform-specific functionality to separate directory to ease porting
• Ported to the GigaDevice GD32F205 ARM Cortex processor
• Removal of Arduino core dependency
• Buffered log functions
• Simultaneous transfer between SD card and SCSI bus for improved performance

Origins and License

Firmware origins

The ZuluSCSI firmware is derived from two sources, both under GPL 3 license:

• SCSI2SD V6
• BlueSCSI, which in turn is derived from ArdSCSIno-stm32.

Hardware

The ZuluSCSI V1.0 and V1.1 hardware designs are derived from the SCSI2SD V5.1 hardware design.