Dashboard: SPBLB

       Name: SPBLB                                                   [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Light up the space station indicator ("S") on the dashboard
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * KS4 calls SPBLB
             * NWSPS calls SPBLB
             * RES2 calls SPBLB


.SPBLB

 LDA SCELL              ; EOR the colour byte at SCELL with the colour of the
 EOR #BULBCOL           ; space station indicator bulb, so this either zeroes
 STA SCELL              ; the character block for the top part of the space
                        ; station bulb, which will hide it, or it sets it to
                        ; BULBCOL, which will show it (so this toggles the top
                        ; part of the space station bulb)

 LDA SCELL+40           ; Do the same for the bottom part of the space station
 EOR #BULBCOL           ; bulb
 STA SCELL+40

 RTS                    ; Return from the subroutine