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⌂ ∞ ▽ Elite on the 6502

Dashboard: DIALS (Part 4 of 4)

[Apple II version]

       Name: DIALS (Part 4 of 4)                                     [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Update the dashboard: shields, fuel, laser & cabin temp, altitude
  Deep dive: The dashboard indicators

    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file




 LDA #16                ; Set K = 16 to use as the pixel x-coordinate of the
 STA K                  ; left end of the indicators in the left half of the
                        ; dashboard, which we draw now

 LDA FSH                ; Draw the forward shield indicator using a range of
 JSR DIS1               ; 0-255

 LDA ASH                ; Draw the aft shield indicator using a range of 0-255
 JSR DIS1

 LDA QQ14               ; Draw the fuel level indicator using a range of 0-63
 JSR DIS1+2

 LDA ALTIT              ; Draw the altitude indicator using a range of 0-255
 JSR DIS1

 LDA CABTMP             ; Draw the cabin temperature indicator using a range of
 JSR DIS1               ; 0-255

 LDA GNTMP              ; Draw the laser temperature indicator using a range of
 JSR DIS1               ; 0-255

 JMP COMPAS             ; We have now drawn all the indicators, so jump to
                        ; COMPAS to draw the compass, returning from the
                        ; subroutine using a tail call