BlueSCSI Wi-Fi Desk Accessory

The open-source, open-hardware SCSI emulator BlueSCSI v2 can emulate a SCSI Ethernet device using the Wi-Fi chip on its Raspberry Pi Pico W microcontroller, with firmware functionality I wrote in mid-2023. While this becomes largely set-it-and-forget-it on desktops, portable Macintoshes can benefit from the ability to see Wi-Fi signal strength and join other networks without having to edit the BlueSCSI configuration file.

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In addition to the basic network packet bridging code that I added to BlueSCSI's firmware, I also added a set of vendor SCSI commands that enable scanning for nearby networks, joining a new network, and viewing current network information. For Macs running System 6 and later (tested with System 6 and 7), I've created a Desk Accessory that uses this functionality.

BlueSCSI Wi-Fi Desk Accessory is free software. licensed under the terms of the ISC license. I also have some videos about its development and C programming on System 6 in general.

Latest Update: BlueSCSI Wi-Fi Desk Accessory 1.1 Released (2024-01-29)

BlueSCSI Wi-Fi Desk Accessory 1.1 has been released:

  • wifi_da-1.1.sit (StuffIt 3 archive)
    SHA256: db06d941d7322089d8a98ebabf1f9a50b8f75ade80edbb355c127acc9a7fa629
    SHA1: c9d6d3d165626ce592a65fd9e2011f361a0f78e4

Changes in this version:

  • Fix masked password entry on Mac OS 8+
  • Truncate display of long Wi-Fi network names

Previous Updates

Source Code

Source code and its THINK C project file are contained in the latest release archive, or it can be viewed on AmendHub.


On System 7 and above, drag the Wi-Fi suitcase onto the System Folder and click OK when asked to put it into the Apple Menu Items folder.

On System 6, launch the included Font/DA Mover utility. Click the Desk Accessory radio button at the top, then click Open… and locate and select the Wi-Fi DA suitcase. Select Wi-Fi from the list on the right side, then click « Copy « and Quit. A restart may be required.


After installation, a Wi-Fi item will appear in the Apple menu's list of Desk Accessories.

Once launched, the Wi-Fi DA will scan the SCSI bus to find a compatible DaynaPORT SCSI/Link device and then check to make sure it's actually a BlueSCSI emulated device.

Probing the SCSI bus
No Wi-Fi connection

The DA will then query the device for the current Wi-Fi network name and RSSI, and launch a background scan of nearby networks. Clicking on the network name will pop-up a list of networks which is populated once the background scan completes (usually within a couple seconds). If the selected network uses encryption and requires a password, the DA will prompt you for it.

Selecting a new network
Entering an protected network password

After again asking the BlueSCSI device for its status, if it is now connected, the DA will update with the network name and RSSI:

Connected with a slightly weak signal

As the Wi-Fi DA is left running, it will periodically poll the BlueSCSI device for its current network name and RSSI and update the window accordingly. At larger intervals, it will do a periodic background scan to keep its list of nearby networks up to date.


BlueSCSI is a trademark of Helgeson Technology Services, LLC and is used with permission.