Loader: Elite GMA loader (Part 3 of 4)

       Name: Elite GMA loader (Part 3 of 4)                          [Show more]
       Type: Subroutine
   Category: Loader
    Summary: Run the Elite loader in the GMA4 file
    Context: See this subroutine in context in the source code
 References: This subroutine is called as follows:
             * SetUpFastLoader calls via load3


 Other entry points:

   load3                Jump to the entry point in elite-loader


IF _GMA86_PAL

 LDA #4                 ; Call LoadGMAFile to load the GMA4 file, which contains
 JSR LoadGMAFile        ; the Elite loader and game data

ELIF _GMA85_NTSC

 LDA #'4'               ; Call LoadGMAFile to load the GMA4 file, which contains
 JSR LoadGMAFile        ; the Elite loader and game data

ENDIF

 JSR KERNALSCINIT       ; Call the Kernal's SCINIT function to initialise the
                        ; VIC-II

 LDA #2                 ; Set VIC register $20 to set the border colour to the
 STA VIC+$20            ; colour number in bits 0-3 (i.e. colour 2, red)

 STA VIC+$21            ; Set VIC register $21 to set the background colour to
                        ; the colour number in bits 0-3 (i.e. colour 2, red)

 LDA #$04               ; Set the high byte of the pointer to screen memory to
 STA $0288              ; $04, so screen memory gets set to $0400

 LDA #$4C               ; Insert the following instruction into address $CE0E:
 STA $CE0E              ;
 LDA #LO(load4)         ;   JMP load4
 STA $CE0F              ;
                        ; starting with the opcode ($4C) and the low byte of the
                        ; address

.load3

 LDA #HI(load4)         ; And finishing up with the high byte of the address
 STA $CE10              ;
                        ; This enables the Elite loader to jump back to load4
                        ; when it has finished by doing a JMP $CE0E instruction
                        ; (see elite-loader.asm)

 JMP ENTRY              ; Jump to the entry point in elite-loader, which returns
                        ; to load4 via the JMP command we put in $CE0E above