Programowanie: Rysowanie punktu
From Atariki
Plot dla trybu lowres (Graphics 15) 160x192:
COLOR = 1 ;kolor z zakresu 0,1,2,3 org $80 adr .ds 2 ;Y = y, X = x plot: lda lnadl,y sta adr lda lnadh,y sta adr+1 ldy byteoff,x lda (adr),y and bytemask,x ora bytepxl,x sta (adr),y rts lnadl: :192 .byte <(screen+40*#) lnadh: :192 .byte >(screen+40*#) byteoff: :160 .byte #/4 bytemask: :160 .byte ~(%11 << (6 - ((# & %11) * 2))) bytepxl: :160 .byte COLOR << (6 - ((# & %11) * 2))
Plot dla trybu hires (Graphics 8) 320x192:
COLOR = 1 ;kolor z zakresu 0,1 org $80 adr .ds 2 ;Y = y, X = <x, C = >x plot: lda lnadl,y sta adr lda lnadh,y sta adr+1 bcs ?1xx ?0xx: ldy byteoff,x lda (adr),y and bytemask,x ora bytepxl,x sta (adr),y rts ?1xx: ldy byteoff+$100,x lda (adr),y and bytemask,x ora bytepxl,x sta (adr),y rts lnadl: :192 .byte <(screen+40*#) lnadh: :192 .byte >(screen+40*#) byteoff: :320 .byte #/8 bytemask: :256 .byte ~(1 << (7 - (# & %111))) bytepxl: :256 .byte COLOR << (7 - (# & %111))