Skip to navigation

⌂ ∞ Elite on the BBC Micro and NES

Missions: TBRIEF

[NES version, Bank 0]

       Name: TBRIEF                                                  [Show more]
       Type: Subroutine
   Category: Missions
    Summary: Start mission 3
  Deep dive: The Trumbles mission

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




.TBRIEF

 JSR ClearScreen_b3     ; Clear the screen by zeroing patterns 66 to 255 in
                        ; both pattern buffer, and clearing both nametable
                        ; buffers to the background tile

 LDA #$95               ; Clear the screen and set the view type in QQ11 to $95
 JSR TT66               ; (Text-based mission briefing)

 LDA TP                 ; Set bit 4 of TP to indicate that mission 3 has been
 ORA #%00010000         ; triggered
 STA TP

 LDA #199               ; Print extended token 199, which is the briefing for
 JSR DETOK_b2           ; the Trumbles mission

 JSR UpdateView         ; Update the view

 JSR YESNO              ; Call YESNO to wait until either "Y" or "N" is pressed

 CMP #1                 ; If "N" was pressed, then the mission was not accepted,
 BNE BAYSTEP            ; jump to BAYSTEP to go to the docking bay (i.e. show
                        ; the Status Mode screen)

 LDY #HI(50000)         ; Otherwise the mission was accepted, so subtract
 LDX #LO(50000)         ; 50,000 CR from the cash pot to pay for the Trumble
 JSR LCASH

 INC TRIBBLE            ; Increment the number of Trumbles from 0 to 1, so they
                        ; start breeding

 JMP BAY                ; Go to the docking bay (i.e. show the Status Mode
                        ; screen)