Keyboard: DKJ1

       Name: DKJ1                                                    [Show more]
       Type: Subroutine
   Category: Keyboard
    Summary: Read joystick and flight controls
    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file


 Specifically, scan the keyboard for the speed up and slow down keys, and read
 the joystick's fire button and X and Y axes, storing the results in the key
 logger and the joystick position variables.

 This routine is only called if joysticks are enabled (JSTK = non-zero).


;.DKJ1                  ; These instructions are commented out in the original
;                       ; source (they are from the BBC Micro version)
;LDA auto
;BNE auton
;
;LDA KTRAN+1
;STA KL+1
;LDA KTRAN+2
;STA KL+2
;
;.BS1
;
;LDA KTRAN+12
;TAX
;AND #16
;EOR #16
;STA KL+7
;
;LDX #1
;JSR DKS2
;
;ORA #1
;STA JSTX
;
;LDX #2
;JSR DKS2
;
;EOR JSTGY
;STA JSTY
;
;JMP DK4