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Elite on the BBC Micro

Dashboard: BULB, Removed [Elite-A, Docked]

Name: BULB, Removed [Show more] Type: Subroutine Category: Dashboard Summary: Draw an indicator bulb on the dashboard
Context: See this subroutine in context in the source code References: No direct references to this subroutine in this source file

Arguments: A The y-coordinate of the bulb as a low-byte screen address offset within screen page &7D (as both bulbs are on this character row in the dashboard) (Y X) The address of the character definition of the bulb to be drawn (i.e. ECBT for the E.C.M. bulb, or SPBT for the space station bulb) Other entry points: BULB-2 Set the Y screen address
\ --- Mod: Original Acornsoft code removed: -----------> \.BULB \ STA SC \ Store the low byte of the screen address in SC \ STX P+1 \ Set P(2 1) = (Y X) \ STY P+2 \ LDA #&7D \ Set A to the high byte of the screen address, which is \ \ &7D as the bulbs are both in the character row from \ \ &7D00 to &7DFF \ JMP RREN \ Call RREN to print the character definition pointed to \ \ by P(2 1) at the screen address pointed to by (A SC), \ \ returning from the subroutine using a tail call \ --- End of removed code ----------------------------->