As a follow-on to our original ZuluSCSI Wide, which we launched a little over seven months ago, in August of 2025, we're pleased to announce our next Open Source Hardware emulator, ZuluSCSI Ultra Wide OSHW, under the CERN Open Hardware License (Strongly reciprocal variant) v2.
The ZuluSCSI Ultra Wide OSHW design is certified by the Open Source Hardware Alliance.
We've done an initial production run of them, which are available fully-assembled starting at $68. These are available directly from Rabbit Hole Computing at https://shop.rabbitholecomputing.com/products/zuluscsi-ultra-wide-oshw.
More details, including KiCad design files, fabrication files, etc, can be accessed at https://github.com/ZuluSCSI/ZuluSCSI-Ultra-Wide-OSHW-RP2350B
ZuluSCSI Ultra Wide OSHW supports synchronous SCSI transfers, with read speeds up to 35 megabytes/second, and write throughput of up to 18 megabytes/second. A huge amount of engineering and testing work has gone in to the firmware development to enable this hardware to do something useful
ZuluSCSI Ultra Wide also supports 16-bit initiator mode, allowing you to read data from 16-bit Wide SCSI devices without the need for any adapters.
A 68-pin Wide/Ultra Wide SCSI controller is required to achieve maximum throughput, along with a sufficiently-fast SD card.
It's important to note that Apple never shipped any consumer Macintosh computers with built-in 16-bit Wide SCSI controllers, although they did provide 16-bit PCI SCSI add-in controllers as a build-to-order option, starting around the beige G3 and B&W G3/New World era, and they were commonly available as aftermarket add-on PCI cards.
The ZuluSCSI Ultra Wide OSHW design is certified by the Open Source Hardware Alliance.
We've done an initial production run of them, which are available fully-assembled starting at $68. These are available directly from Rabbit Hole Computing at https://shop.rabbitholecomputing.com/products/zuluscsi-ultra-wide-oshw.
More details, including KiCad design files, fabrication files, etc, can be accessed at https://github.com/ZuluSCSI/ZuluSCSI-Ultra-Wide-OSHW-RP2350B
ZuluSCSI Ultra Wide OSHW supports synchronous SCSI transfers, with read speeds up to 35 megabytes/second, and write throughput of up to 18 megabytes/second. A huge amount of engineering and testing work has gone in to the firmware development to enable this hardware to do something useful
ZuluSCSI Ultra Wide also supports 16-bit initiator mode, allowing you to read data from 16-bit Wide SCSI devices without the need for any adapters.
A 68-pin Wide/Ultra Wide SCSI controller is required to achieve maximum throughput, along with a sufficiently-fast SD card.
It's important to note that Apple never shipped any consumer Macintosh computers with built-in 16-bit Wide SCSI controllers, although they did provide 16-bit PCI SCSI add-in controllers as a build-to-order option, starting around the beige G3 and B&W G3/New World era, and they were commonly available as aftermarket add-on PCI cards.
