The basicBootstrap (Disk Loader 1) variable

       Name: basicBootstrap                                          [Show more]
       Type: Variable
   Category: Loader
    Summary: Call the RelocateLoader routine even if the firebird file is
             loaded as a BASIC program
    Context: See this variable in context in the source code
 References: No direct references to this variable in this source file


.basicBootstrap

 EQUW $080B             ; Although we have set a PRG address of $02A7, it is
 EQUW $0001             ; possible to ignore a file's PRG when loading (you just
 EQUB $9E               ; need to omit the ",1" part of the LOAD"*",8,1 command)
 EQUS "2061"            ;
 EQUB 0                 ; In this case the file will be loaded as a BASIC file
                        ; at the standard address of $0801, so to make sure we
                        ; still run the game, the firebird loader starts with a
                        ; tokenised one-line BASIC program that contains the
                        ; following:
                        ;
                        ;   1 SYS 2061
                        ;
                        ; 2061 is $080D in hexadecimal, which is the address of
                        ; the RelocateLoader routine if this file is loaded at
                        ; $0801; the RelocateLoader routine is supposed to be at
                        ; $02B3, but if the file is loaded at $0801 instead of
                        ; $02A7, RelocateLoader ends up at this address:
                        ;
                        ;   $02B3 + $0801 - $02A7 = $080D
                        ;
                        ; So this BASIC program ensures that we call the
                        ; RelocateLoader routine, even if we omit the ",1" from
                        ; the load command

 EQUW 0                 ; These bytes appear to be unused
Loader: basicBootstrap

[Commodore 64 version, Disk Loader 1]
