Version analysis of MT27 - Elite on the 6502

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

Disc (docked), 6502 Second Processor and Master

Code variations between these versions are shown below.

       Name: MT27
       Type: Subroutine
   Category: Text
    Summary: Print the captain's name during mission briefings
  Deep dive: Extended text tokens
             The Constrictor mission


 This routine prints the following tokens, depending on the galaxy number:

   * Token 217 ("CURRUTHERS") in galaxy 0

   * Token 218 ("FOSDYKE SMYTHE") in galaxy 1

   * Token 219 ("FORTESQUE") in galaxy 2

 This is used when printing extended token 213 as part of the mission
 briefings, which looks like this when printed:

   Commander {commander name}, I am Captain {mission captain's name} of Her
   Majesty's Space Navy

 where {mission captain's name} is replaced by one of the names above.


.MT27

 LDA #217               \ Set A = 217, so when we fall through into MT28, the
                        \ 217 gets added to the current galaxy number, so the
                        \ extended token that is printed is 217-219 (as this is
                        \ only called in galaxies 0 through 2)

Code variation 1 of 1Minor and very low-impact

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

Docked, 6502SP
Master
 EQUB &2C               \ Skip the next instruction by turning it into
                        \ &2C &A9 &DC, or BIT &DCA9, which does nothing apart
                        \ from affect the flags
 BNE P%+4               \ Skip the next instruction