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⌂ ∞ ▽ Elite on the 6502

Version analysis of DEBRIEF

This code appears in the following versions (click to see it in the source code):

Code variations between these versions are shown below.

       Name: DEBRIEF
       Type: Subroutine
   Category: Missions
    Summary: Finish mission 1
  Deep dive: The Constrictor mission



 Other entry points:

   BRPS                 Print the extended token in A, show the Status Mode
                        screen and return from the subroutine



.DEBRIEF

 LSR TP                 \ Clear bit 0 of TP to indicate that mission 1 is no
 ASL TP                 \ longer in progress, as we have completed it

Code variation 1 of 1Related to an advanced feature

In the disc and 6502SP versions, killing the Constrictor at the end of mission 1 gives you 256 kill points, but only when you attend the debriefing. In the Master and NES versions, you get the kill points the instant you kill the Constrictor.

Tap on a block to expand it, and tap it again to revert.

Docked, 6502SP
Master
 INC TALLY+1            \ Award 256 kill points for completing the mission

\INC TALLY+1            \ This instruction is commented out in the original
                        \ source

 LDX #LO(50000)         \ Increase our cash reserves by the generous mission
 LDY #HI(50000)         \ reward of 5,000 CR
 JSR MCASH

 LDA #15                \ Set A = 15 so the call to BRP prints extended token 15
                        \ (the thank you message at the end of mission 1)

.BRPS

 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)