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⌂ ∞ ▽ Elite on the 6502

Universe: SOS1

[NES version, Bank 0]

       Name: SOS1                                                    [Show more]
       Type: Subroutine
   Category: Universe
    Summary: Update the missile indicators, set up the planet data block

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * SOLAR calls SOS1
             * TT110 calls SOS1




 Update the missile indicators, and set up a data block for the planet, but
 only setting the pitch and roll counters to 127 (no damping).



.SOS1

 JSR msblob             ; Reset the dashboard's missile indicators so none of
                        ; them are targeted

 LDA #127               ; Set the pitch and roll counters to 127, so that's a
 STA INWK+29            ; clockwise roll and a diving pitch with no damping, so
 STA INWK+30            ; the planet's rotation doesn't slow down

 LDA tek                ; Set A = 128 or 130 depending on bit 1 of the system's
 AND #%00000010         ; tech level in tek
 ORA #%10000000

 JMP NWSHP              ; Add a new planet to our local bubble of universe,
                        ; with the planet type defined by A (128 is a planet
                        ; with an equator and meridian, 130 is a planet with
                        ; a crater)