A BBC Master external GoTek with a Blackberry style trackball

A Gotek running the FlashFloppy firmware and stuck in an external case. Here's the case files: https://www.printables.com/model/382574-gotek-external-case-with-top-mounted-oled-and-blac Here's the trackball on eBay: https://www.ebay.co.uk/itm/275370428714 And the instructions for adding it to a flash floppy flashed Gotek: https://github.com/keirf/FlashFloppy/wiki/Hardware-Mods#blackberry-trackball