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⌂ ∞ Elite on the BBC Micro and NES

Dashboard: ECBLB

[Elite-A, I/O processor]

       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:
             * tube_table calls ECBLB




 This routine is run when the parasite sends a draw_E command. It lights up the
 E.C.M. indicator bulb ("E") on the dashboard.



.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
 LDY #HI(ECBT)          \ ECBT

 JMP BULB               \ Jump down to BULB