Routines
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38027: Capture ZX Interface 2 joystick 1 input
Used by the routine at 37876.
Input
HL 23485 (store for currently active keyboard press / joystick action)
Output
A Stored key-press (bits: 0=LEFT, 1=RIGHT, 2=UP, 3=DOWN, 4=FIRE)
38027 LD C,254 IN 61438 reads the half row O to 6...
38029 LD B,239 ...
38031 IN A,(C) ...
38033 BIT 4,A If joystick moved left ("6" key pressed)...
38035 CALL Z,38060 ...store a LEFT input from control device
38038 BIT 3,A If joystick moved right ("7" key pressed)...
38040 CALL Z,38063 ...store a RIGHT input from control device
38043 BIT 2,A If joystick moved down ("8" key pressed)...
38045 CALL Z,38069 ...store a DOWN input from control device
38048 BIT 1,A If joystick moved down ("9" key pressed)...
38050 CALL Z,38066 ...store an UP input from control device
38053 BIT 0,A If fire button pressed ("0" key pressed)...
38055 CALL Z,38072 ...store a FIRE input from control device
38058 LD A,(HL) Return stored joystick movement in A
38059 RET Return
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