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⌂ ∞ ▽ Elite on the 6502

Missions: DEBRIEF2

[Commodore 64 version]

       Name: DEBRIEF2                                                [Show more]
       Type: Subroutine
   Category: Missions
    Summary: Finish mission 2
  Deep dive: The Thargoid Plans mission

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * DOENTRY calls DEBRIEF2




.DEBRIEF2

 LDA TP                 ; Set bit 2 of TP to indicate mission 2 is complete (so
 ORA #%00000100         ; both bits 2 and 3 are now set)
 STA TP

 LDA #2                 ; Set ENGY to 2 so our energy banks recharge at a faster
 STA ENGY               ; rate, as our mission reward is a special navy energy
                        ; unit that recharges at a rate of 3 units of energy on
                        ; each iteration of the main loop, compared to a rate of
                        ; 2 units of energy for the standard energy unit

 INC TALLY+1            ; Award 256 kill points for completing the mission

 LDA #223               ; Set A = 223 so the call to BRP prints extended token
                        ; 223 (the thank you message at the end of mission 2)

 BNE BRP                ; Jump to BRP to print the extended token in A and show
                        ; the Status Mode screen), returning from the subroutine
                        ; using a tail call (this BNE is effectively a JMP as A
                        ; is never zero)