Dashboard: ECBLB

       Name: ECBLB                                                   [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Light up the E.C.M. indicator bulb ("E") on the dashboard
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * ECMOF calls ECBLB


.ECBLB

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

 LDA ECELL+40           ; Do the same for the bottom part of the E.C.M. bulb
 EOR #BULBCOL
 STA ECELL+40

 RTS                    ; Return from the subroutine