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0x0B ( 11 )  Joystick I/O Mode
  
BitsDescription
71 to enable i/o mode
6Reserved, must be 0
5:4I/O Mode 00 = bit bang 01 = clock 10 = uart on left joystick port 11 = uart on right joystick port
3:1Reserved, must be 0
0Parameter bit bang : copied to pin 7 clock : 0 = hold high when clock becomes high, 1 = run * uart : 0 = redirect esp uart0 to joystick, 1 = redirect pi uart1 to joystick (Tx out on pin 7, Rx in from pin 9, CTS_n in from pin 6 **)

* CTC channel 3 is currently used to drive pin 7 in clock mode. Freq = Fctc3 / 2.

** CTS_n is only active if the seleced uart is in hw flow control mode.

Notes:
  The state of output pin 7 is stored internally in a register and is retained across changing
  modes and while i/o mode is disabled.  While in i/o mode, keyboard joystick types (Sinclair,
  Cursor, etc) produce no readings but the current state of pins can still be read via the
  Kempston ports.  When leaving i/o mode, joystick operation resumes after ~64 scan lines
  have passed.