The S% (Docked) workspace - Elite on the 6502

       Name: S%                                                      [Show more]
       Type: Workspace
    Address: &11E3 to &11F0
   Category: Workspaces
    Summary: Entry points and vector addresses in the main docked code
  Deep dive: Swapping between the docked and flight code
    Context: See this workspace in context in the source code
 References: No direct references to this workspace in this source file


.S%

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

\JMP DOENTRY            \ Decrypt the main docked code and dock at the station
\
\JMP DOBEGIN            \ Decrypt the main docked code and start a new game
\
\JMP CHPR               \ WRCHV is set to point here by elite-loader3.asm, so
\                       \ CHPR is set as the character write routine
\
\EQUW IRQ1              \ IRQ1V is set to the address in these two bytes by
\                       \ elite-loader3.asm, so IRQ1V points to IRQ1
\
\JMP BRBR1              \ BRKV is set to point here by elite-loader3.asm, so
\                       \ BRBR1 is set as the break handler
\
\BRKV = P% - 2          \ The address of the destination address in the above
\                       \ JMP BRBR1 instruction. This ensures that any code that
\                       \ updates BRKV will update this instruction instead of
\                       \ the actual vector

                        \ --- And replaced by: -------------------------------->

 JMP DOENTRY            \ Dock at the station

 JMP DOBEGIN            \ Start a new game

 JMP CHPR               \ WRCHV is set to point here by elite-loader3.asm, so
                        \ CHPR is set as the character write routine

 EQUW IRQ1              \ IRQ1V is set to the address in these two bytes by
                        \ elite-loader.asm, so IRQ1V points to IRQ1

 JMP BRBR               \ BRKV is set to point here by elite-loader.asm, so
                        \ BRBR is set as the break handler

 BRKV = P% - 2          \ The address of the destination address in the above
                        \ JMP BRBR instruction. This ensures that any code that
                        \ updates BRKV will update this instruction instead of
                        \ the actual vector

                        \ --- End of replacement ------------------------------>

 PRINT "S% workspace (docked) from ", ~S%, "to ", ~P%-1, "inclusive"

[X]

Subroutine BRBR (category: Utility routines)

The standard BRKV handler for the game

[X]

Subroutine CHPR (category: Text)

Print a character at the text cursor by poking into screen memory

[X]

Subroutine DOBEGIN (category: Loader)

Initialise the configuration variables and start the game

[X]

Subroutine DOENTRY (category: Flight)

Dock at the space station, show the ship hangar and work out any mission progression

[X]

Configuration variable IRQ1 = &114B

The address of the IRQ1 routine that implements the split screen interrupt handler, as set in elite-loader.asm

Workspaces: S%

[Elite-A, Docked]