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⌂ ∞ Elite on the BBC Micro and NES

Flight: MJP

[NES version, Bank 0]

       Name: MJP                                                     [Show more]
       Type: Subroutine
   Category: Flight
    Summary: Process a mis-jump into witchspace

    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * TT18 calls MJP




 Process a mis-jump into witchspace (which happens very rarely). Witchspace has
 a strange, almost dust-free aspect to it, and it is populated by hostile
 Thargoids. Using our escape pod will be fatal, and our position on the
 galactic chart is in-between systems. It is a scary place...

 There is a 0.78% chance that this routine is called from TT18 instead of doing
 a normal hyperspace, or we can manually trigger a mis-jump by holding down
 either the up or down button at the point that the hyperspace countdown
 reaches zero.



 Other entry points:



.MJP

 LDY #29                ; Call the NOISE routine with Y = 29 to make the first
 JSR NOISE              ; sound of a mis-jump

 JSR RES2               ; Reset a number of flight variables and workspaces, as
                        ; well as setting Y to $FF

 STY MJ                 ; Set the mis-jump flag in MJ to $FF, to indicate that
                        ; we are now in witchspace

 LDA QQ1                ; Fetch the current system's galactic y-coordinate in
 EOR #%00011111         ; QQ1 and flip bits 0-5, so we end up somewhere in the
 STA QQ1                ; vicinity of our original destination, but above or
                        ; below it in the galactic chart

.MJP1

 JSR GTHG               ; Call GTHG three times to spawn three Thargoid ships
 JSR GTHG               ; and three Thargon companions
 JSR GTHG

 LDA #3                 ; Set NOSTM (the maximum number of stardust particles)
 STA NOSTM              ; to 3, so there are fewer bits of stardust in
                        ; witchspace (normal space has a maximum of 18)

 JSR SelectNearbySystem ; Set the current system to the nearest system to
                        ; (QQ9, QQ10) and update the selected system flags
                        ; accordingly

 JSR UpdateIconBar_b3   ; Update the icon bar to show the hyperspace icon

 LDY #30                ; Call the NOISE routine with Y = 30 to make the second
 JSR NOISE              ; sound of a mis-jump

 JMP RedrawCurrentView  ; Update the current view for when we arrive in a new
                        ; system, returning from the subroutine using a tail
                        ; call