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 #LO(ECBT)          ; Set A to the low byte of the character definition in
                        ; ECBT, to pass to BULB

 LDX #7*8               ; The E.C.M. bulb is in character block number 7 and
                        ; each character is eight pixels wide, so this sets
                        ; X to the pixel x-coordinate of the bulb we want to
                        ; draw

 BNE BULB               ; Jump down to BULB (this BNE is effectively a JMP as
                        ; A will never be zero)