Shoebill is an all-new, BSD-licensed Macintosh II emulator designed from the ground up with the singular goal of running A/UX, first presented on . Shoebill requires a Macintosh II, IIx or IIcx ROM, e.g. from , and a disk image with A/UX installed. Shoebill is different from other Macintosh emulators in how it boots. Instead of booting directly into the Macintosh ROM, Shoebill implements a bootloader and boots directly into A/UX itself. Traditionally, A/UX is booted by first booting Mac OS, and then running SASH/launch to mount the A/UX root partition, run fsck if necessary, load the unix kernel, and then boot it. SASH provides the ability to manipulate the A/UX filesystem while actually running in regular Mac OS. Shoebill cannot boot into regular Mac OS, although that's a future goal. Instead, it replicates the functionality of Apple's bootloader, and boots directly into A/UX.