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 #7*8               \ The E.C.M. bulb is in character block number 7
                        \ with each character taking 8 bytes, so this sets the
                        \ low byte of the screen address of the character block
                        \ we want to draw to

 LDX #LO(ECBT)          \ Set (Y X) to point to the character definition in
                        \ ECBT (we set Y below with the jump to BULB-2, which
                        \ writes the high byte of SPBT into Y

 BNE BULB-2             \ Jump down to BULB-2 (this BNE is effectively a JMP as
                        \ A will never be zero)