Advanced Plus 3 thumb|right|250px|The PRES Advanced Plus 3 with a 3½-inch drive Designed and produced by Baildon Electronics and sold by PRES, the Advanced Plus 3 (AP3) was a Plus 1 cartridge interface using the WD1770 controller, supplied with Acorn's ADFS and a single-sided 3½-inch disc drive for £99 plus VAT, offering equivalent functionality to the Acorn Plus 3. Announced in late 1987, the product was made possible by an agreement between ACP and Acorn to license the ADFS software. As with many disc interfaces for the Electron, since the interface provided a connector for the drive, this made it possible to connect a 5¼" floppy disc drive (more common amongst BBC Micro owners) or the more typical 3½-inch drive.
Advanced Plus 3 thumb|right|250px|The PRES Advanced Plus 3 with a 3½-inch drive Designed and produced by Baildon Electronics and sold by PRES the Advanced Plus 3 (AP3) was a Plus 1 cartridge interface using the WD1770 controller, supplied with Acorn's ADFS and a single-sided 3½-inch disc drive for £99 plus VAT, offering equivalent functionality to the Acorn Plus 3 Announced in late 1987, the product was made possible by an agreement between ACP and Acorn to license the ADFS software As with many disc interfaces for the Electron, s.ince th.e interface provided a connector for the drive, this made it possible to connect a 5¼" floppy disc drive (more common amongst BBC Micro owners) or the more typical, 3½-inch drive.