George Washingtoad Posted May 1, 2019 Share Posted May 1, 2019 Hey y'all. Having some issues regarding defining spaces. I know that it is extremly important when it comes to setting certain spaces for things in Ram so I really want to get it right. THis is my code now, all help (and pointers) are greatly appreciated ; '2600 for Newbies ; Session 21 - Sprites ; This kernel draws a simple box around the screen border ; Introduces sprites processor 6502 include "vcs.h" include "macro.h" ;---------------------------------------------------------- PATTERN = $80 TIMETOCHANGE = 120 Playfield_Length = 3 ;--------------------------------------------------------- ;I Figured SEG.U vars ORG $80 MyPF0 ds 3 MyPF1 ds 3 MyPF2 ds 3 ;------------------------------------------------------------------------------ SEG code ORG $F000 Reset ; Clear RAM and all TIA registers ldx #0 lda #0 Clear sta 0,x inx bne Clear ;------------------------------------------------ ; Once-only initialisation... lda #$45 sta COLUPF ; set the playfield colour lda #$56 sta COLUP0 lda #$67 sta COLUP1 lda #%00000000 sta CTRLPF ; reflect playfield ;------------------------------------------------ LDA #0 STA PATTERN MyPF0 .byte %01010101 .byte %10101010 .byte %01010101 MyPF1 .byte %10101010 .byte %01010101 .byte %10101010 MyPF2 .byte %01010101 .byte %10101010 .byte %01010101 StartOfFrame ; Start of new frame ; Start of vertical blank processing lda #0 sta VBLANK lda #2 sta VSYNC sta WSYNC sta WSYNC sta WSYNC ; 3 scanlines of VSYNC signal lda #0 sta VSYNC ;------------------------------------------------ ; 37 scanlines of vertical blank... ldx #0 VerticalBlank sta WSYNC inx cpx #37 bne VerticalBlank ;------------------------------------------------ ; Do 192 scanlines of colour-changing (our picture) LDX #192 Tick CPX Playfield_Length+1 BCC WRITEIN LDA #%11111111 STA PF0 STA PF1 STA PF2 THISISEND STA WSYNC dex BNE Tick ;------------------------------------------------ lda #%01000010 sta VBLANK ; end of screen - enter blanking ; 30 scanlines of overscan... ldx #0 Overscan sta WSYNC inx cpx #30 bne Overscan jmp StartOfFrame WRITEIN LDA MyPF0,X STA PF0 LDA MyPF1,X STA PF1 LDA MyPF2,X STA PF2 JMP THISISEND ;------------------------------------------------------------------------------ ORG $FFFA InterruptVectors .word Reset ; NMI .word Reset ; RESET .word Reset ; IRQ END In my IDE its saying that I have a label mismatch with MYPF0-2 in the WRITEIN method. That might have something to do withit Quote Link to comment Share on other sites More sharing options...
Nukey Shay Posted May 2, 2019 Share Posted May 2, 2019 The top part of your assembly is defining MyPF#'s as Ram variables, but you used those same labels as Rom data tables. Which do you want them to be (Ram or Rom)? If you want to use Ram (so that the playfield can be altered during the program), You need to copy the data into them. If you just want a static playfield (Rom), do not define them as variables up top. Quote Link to comment Share on other sites More sharing options...
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