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⌂ ∞ Elite on the BBC Micro and NES

Dashboard: SPBLB

[Elite-A, I/O processor]

       Name: SPBLB                                                   [Show more]
       Type: Subroutine
   Category: Dashboard
    Summary: Light up the space station indicator ("S") on the dashboard

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * tube_table calls SPBLB




 This routine is run when the parasite sends a draw_S command. It lights up the
 space station indicator ("S") on the dashboard.



.SPBLB

 LDA #24*8              \ The space station bulb is in character block number 24
                        \ 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(SPBT)          \ Set (Y X) to point to the character definition in SPBT
 LDY #HI(SPBT)

                        \ Fall through into BULB to draw the space station bulb