Joystick Design
A typical joystick is a digital input device that registers movement according to the range of motion that it is designed to detect. Most modern joysticks have an 8-way configuration, allowing for movement in the cardinal directions and the diagonals. There also exist common "analog" sticks that in actuality are implemented as 49-way digital, with incremental degrees of movement in each direction. Many vintage arcade games use a 4-way or even 2-way stick rather than an 8-way stick, which can cause compatibility problems that may be mitigated by the use of an appropriate restrictor gate.
Read more about this topic: Arcade Controller
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