||ADR||HEXADR||NAME||Description||shadow||OS
|635| $027B|STICK3|Joystick 4| [PORTB] |A

This denotes the direction of Joystick 4, where 15 means "centered". It is the higher nibble of [PORTB] 54017 $d301.
Joystick 4 is only available on ATARI 400/800 machines. In XL and XE OS's this register has the same content as [STICK1].

||dec ||left|| ||right
|up|10|14| 6
| |11|15|  7
|down| 9|13| 5

||hex ||left|| ||right
|up|$0A|$0E|$06
| |$0B|$0F|$07
|down|$09|$0D|$05

||bin ||left|| ||right
|up|1010|1110|0110
| |1011|1111|0111
|down|1001|1101|0101

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see also [Controller topics|Controller_topics]

previous: [Joystick 3|STICK2]