64'er 1994 April

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;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC ; genloc parallaxing / parallaxdemo ; ; program by michael strelecki ; ;copyright by michael strelecki in 1994 ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC *= $0900 jmp start fce2 lda #$81 sta $dc0d lda #$2f sta $00 lda #$37 sta $01 jsr $fda3 ldx #$1f fce4 lda $fd30,x sta $0314,x dex bpl fce4 jmp $ff5b ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC bcolour = $8f00 hin = $f6 vor = $f8 ready .byte 0 limove .byte 0 remove .byte 0 d16 .byte 0 d18 .byte 0 coltakt .byte 0 bank .byte 0 scr2 .byte 0 scr .byte 0 pseu .byte 0 scrflag .byte 0 colflag .byte 0 d18tab .byte 8,$1c screentab .byte $40,$44 ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC start jsr fce2 ;init lda #$00 sta $d011 sta $d020 tax a0 lda #$00 ;beide bildschirme a1 sta $4000,x ;loeschen inx bne a1 inc a1+2 lda a1+2 cmp #$48 bcc a0 sei ;set irq lda #$36 sta $01 lda #$01 sta $d01a sta $dc0d lda #<irq sta $0314 lda #>irq sta $0315 lda #$fc sta $d012 lda #$00 sta $d011 lda #$96 ;bank 1 sta $dd00 jsr parainit cli ;direktmodus ;berechnung von colourram und screen (!) wait lda colflag ;colourram blitt beq x jsr coblit x lda scrflag ;screen blitten? beq wait jsr scblit jmp wait ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC parainit lda #$08 ;registerinit sta pseu lda #$00 sta d16 sta remove sta limove lda #$40 sta scr2 lda #$44 sta scr lda #<$8078 ;startposition sta hin lda #>$8078 sta hin+1 lda #<$91f0 sta vor lda #>$91f0 sta vor+1 ldy #$00 ;screeninit jsr sinit jsr scblit lda #$44 sta scr2 lda #$40 sta scr ldy #$00 jsr sinit jsr scblit jsr coblit lda #$00 sta ready lda #$07 sta $05 sch jsr redo lda scrflag beq sch1 jsr scblit sch1 lda colflag beq sch2 jsr coblit sch2 dec $05 bpl sch lda #$40 sta scr2 lda #$44 sta scr lda #$00 ;mainflag init sta scrflag sta colflag sta ready rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC scblit ldx #17 ;screen blitten sch7 ldy #39 vorne lda $1111,y bne screen hinten lda $1111,y screen sta $1111,y dey bpl vorne lda vorne+1 ;naechste zeilen clc adc #$68 sta vorne+1 lda vorne+2 adc #$01 sta vorne+2 lda hinten+1 clc adc #$c8 sta hinten+1 bcc ueb inc hinten+2 ueb lda screen+1 clc adc #$28 sta screen+1 bcc ueb1 inc screen+2 ueb1 dex ;alle zeilen? bpl sch7 lda ready ora #$01 sta ready inx stx scrflag outi2 rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC bankswap lda colflag ;screenwechsel ora scrflag bne outi2 lda bank tay eor #$01 sta bank tax lda screentab,y sta scr lda d18tab,x sta pseu lda screentab,x sta scr2 lda #$01 ;impuls colourram sta colflag rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC coblit lda scr2 ;colourram blitten sta mix+2 ora #$02 sta block2+2 lda #$d8 sta cram+2 ldx #$01 stx $02 dex stx coltakt mix ldy $4000,x lda bcolour,y cram sta $d800,x inx bne mix inc mix+2 inc cram+2 dec $02 bpl mix ;$0200 bytes? block2 ldy $4200,x ;restliche $d0 lda bcolour,y sta $da00,x inx cpx #$d0 bne block2 lda #$00 sta colflag rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC sinit lda vor ;blitroutinen init sta vorne+1 lda vor+1 sta vorne+2 lda hin sta hinten+1 lda hin+1 sta hinten+2 lda #$00 sta screen+1 lda scr sta screen+2 rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC ;irqmodus ;impulsgeber(!) irq lda #$0f ;obere farben sta $d021 lda #$0b sta $d022 lda #$0c sta $d023 jsr moving lda coltakt cmp #$04 bcc doff lda #$01 ;impuls colourram sta colflag doff lda d16 ;d16 softscroll-> and #$04 ;d18 softscroll lsr a ora pseu sta d18 lda d18 sta $d018 lda d16 ora #$10 sta $d016 lda #$1b sta $d011 lda #<irq1 sta $0314 lda #>irq1 sta $0315 lda #$aa sta $d012 inc $d019 jmp $ea81 ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC irq1 ldx #$03 x1 dex bpl x1 lda #$0d ;untere farben sta $d021 lda #$09 sta $d022 lda #$0c sta $d023 lda #<irq sta $0314 lda #>irq sta $0315 lda #$fc sta $d012 inc $d019 jmp $ea81 ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC moving lda remove ora limove bne abfrage lda coltakt cmp #$02 bcc abfrage inc coltakt rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC joystick ldx #$00 ;joystickabfrage stx limove stx remove inc coltakt inx lda #$ff sta $dc00 lda $dc00 lsr a lsr a lsr a bcs clix stx limove ldy #$00 clix lsr a bcs nojoy stx remove ldy #$01 nojoy rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC abfrage jsr joystick lda remove ;joystick-aktion? bne redo lda limove bne lido0 rts lido0 jmp lido ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC redo lda ready ;rechts scrollen bmi onni lda #$80 sta ready lda bank beq outi inc hin bne outi inc hin+1 outi rts onni tay lda scrflag ora colflag bne links tya and #$01 bne links lda #$01 ;impuls screen sta scrflag jsr sinit links lda vor ;rechtes ende? cmp #$42 bne dolinks lda vor+1 cmp #$92 bne dolinks lda #$00 sta remove rts dolinks lda d16 ;softscroll bne dool tay lda scrflag ora colflag bne outi tya dool sec sbc #$02 and #$07 sta d16 cmp #$06 beq rhard rts rhard lda ready ;hardscroll? and #$01 beq bk3 lda scrflag ora colflag bne bk3 inc vor bne bk1 inc vor+1 bk1 lda bank bne bk2 inc hin bne bk2 inc hin+1 bk2 lda #$80 sta ready jmp bankswap bk3 lda #$00 sta d16 rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC lido lda ready ;links scrollen bpl bum1 lda bank beq bum lda hin sec sbc #$01 sta hin bcs bum dec hin+1 bum lda #$00 sta ready rts bum1 ldy scrflag bne rechts and #$01 bne rechts ldy #$01 ;impuls screen sty scrflag jsr sinit jsr setl rechts lda vor ;linkes ende? bne dorechts lda vor+1 cmp #$91 bne dorechts lda #$00 sta limove outi1 rts dorechts lda d16 ;softscroll cmp #$06 bne sch8 tay lda scrflag ora colflag bne outi1 tya sch8 clc adc #$02 and #$07 sta d16 beq lhard rts lhard lda ready ;hardscroll? and #$01 beq tuffy lda scrflag ora colflag bne tuffy lda vor sec sbc #$01 sta vor bcs xeni dec vor+1 xeni lda bank bne scini lda hin sec sbc #$01 sta hin bcs scini dec hin+1 scini lda #$00 sta ready jmp bankswap tuffy lda #$06 sta d16 rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC setl lda vorne+1 sec sbc #$02 sta vorne+1 bcs popl dec vorne+2 popl lda bank bne posty lda hinten+1 sec sbc #$01 sta hinten+1 bcs posty dec hinten+2 posty rts ;CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC