Maths (Geometry): SPS4, Removed

       Name: SPS4, Removed                                           [Show more]
       Type: Subroutine
   Category: Maths (Geometry)
    Summary: Calculate the vector to the space station
    Context: See this subroutine in context in the source code
 References: No direct references to this subroutine in this source file


 Calculate the vector between our ship and the space station and store it in
 XX15.


                        \ --- Mod: Code removed for Elite-A: ------------------>

\.SPS4
\
\ LDX #8                \ First we need to copy the space station's coordinates
\                       \ into K3, so set a counter to copy the first 9 bytes
\                       \ (the 3-byte x, y and z coordinates) from the station's
\                       \ data block at K% + NI% into K3
\
\.SPL1
\
\ LDA K%+NI%,X          \ Copy the X-th byte from the station's data block at
\ STA K3,X              \ K% + NI% to the X-th byte of K3
\
\ DEX                   \ Decrement the loop counter
\
\ BPL SPL1              \ Loop back to SPL1 until we have copied all 9 bytes
\
\ JMP TAS2              \ Call TAS2 to build XX15 from K3, returning from the
\                       \ subroutine using a tail call

                        \ --- End of removed code ----------------------------->