bus | Bus Éireann | 26th parallel south | 10th parallel south | 34th parallel north | 31st parallel south | Parallel universe (fiction) | interface | Graphical user interface | graphical user interface | 9th parallel north | 11th parallel north | User interface | The Magic School Bus | Parallel computing | parallel | 5th parallel south | 41st parallel south | 40th parallel south | 40th parallel north | 35th parallel south | 28th parallel south | Application programming interface | 45th parallel north | 20th parallel south | 18th parallel south | 15th parallel north | 10th parallel north | Wellington Street bus station | User interface design |
In order to support expansion for high-end systems, similar to the card slots used in the Apple II or S-100 machines, the 1000 series also supported the Parallel Bus Interface (PBI), a single expansion slot on the back of the machine.