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⌂ ∞ ▽ Elite on the BBC Micro and NES

Dashboard: ECBLB

[Acorn Electron version]

       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
 Variations: See code variations for this subroutine in the different versions
 References: This subroutine is called as follows:
             * ECMOF calls ECBLB




.ECBLB

 LDA #&98               \ Set A to the low byte of the screen address of the
                        \ E.C.M. bulb (which is at &7C98)

 LDX #LO(ECBT)          \ Set X to the low byte of the address of the character
                        \ definition in ECBT

 LDY #&7C               \ Set Y to the high byte of the screen address of the
                        \ E.C.M. bulb (which is at &7C98)

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