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⌂ ∞ Elite on the BBC Micro and NES

Controllers: U%

[NES version, Bank 0]

       Name: U%                                                      [Show more]
       Type: Subroutine
   Category: Controllers
    Summary: Clear the key logger

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DEATH2 calls U%
             * TITLE calls U%




 Returns:

   A                    A is set to 0



.U%

 LDX #6                 ; We want to clear the 6 key logger locations from
                        ; KY1 to KY6, so set a counter in X

 LDA #0                 ; Set A to 0, as this means "key not pressed" in the
                        ; key logger at KL

 STA iconBarKeyPress    ; Reset the key logger entry for the icon bar button
                        ; choice

.DKL3

 STA KL,X               ; Store 0 in the X-th byte of the key logger

 DEX                    ; Decrement the counter

 BPL DKL3               ; Loop back for the next key, until we have cleared from
                        ; KL to KL+6 (i.e. KY1 through KY6)

 RTS                    ; Return from the subroutine