The article describes a project to create a Macintosh computer for under £5 using a Raspberry Pi RP2040 microcontroller board. The project, called MicroMac, emulates a Macintosh 128K computer and can run old Macintosh software. The author details the development journey, including the challenges of emulating the Macintosh hardware and software. The project uses a combination of existing emulators and custom code to achieve this goal.