mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-05-28 17:41:29 +00:00
198 lines
2.4 KiB
ArmAsm
198 lines
2.4 KiB
ArmAsm
; flames -- Apple II Hires
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; D0+ used by HGR routines
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HGR_COLOR = $E4
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HGR_PAGE = $E6
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GBASL = $26
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GBASH = $27
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HGR_X = $E0
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GBASL_SAVED = $FF
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; soft-switches
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PAGE1 = $C054
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; ROM routines
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HGR2 = $F3D8 ; set hires page2 and clear $4000-$5fff
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HPOSN = $F411 ; (Y,X),(A) (values stores in HGRX,XH,Y)
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WAIT = $FCA8 ; delay 1/2(26+27A+5A^2) us
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flamees:
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jsr HGR2
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bit PAGE1
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;==================
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; setup
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ldx #39
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lda #$f
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white_line_loop:
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sta $5FD0,X
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dex
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bpl white_line_loop
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fire_loop:
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;====================
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; move fire
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jsr move_fire
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;====================
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; copy to visible
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jsr copy_to_page1
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;====================
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; loop forever
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jmp fire_loop
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move_fire:
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ldx #191
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burn_loop:
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txa
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jsr HPOSN ; puts addr of line in A into GBASL:GBASH
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lda GBASL
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sta GBASL_SAVED
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lda GBASH
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sta burn_in_smc+2
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ldx HGR_X
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dex
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txa
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jsr HPOSN
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lda GBASL
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sta burn_out_smc+1
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lda GBASH
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sta burn_out_smc+2
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ldy #39
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burn_inner:
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random_smc:
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lda $D000 ; RANDOM?
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pha
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; and #$3
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; sbc #$2
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; adc GBASL_SAVED
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; sta burn_in_smc+1
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lda GBASL_SAVED
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sta burn_in_smc+1
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pla
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no_wind:
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and #$1
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bne dont_invert_dex
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lda dex_smc
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eor #$20
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sta dex_smc
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dont_invert_dex:
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burn_in_smc:
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ldx $4000,Y
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beq skip_if_zero
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dex_smc: ; DEX = $CA, NOP = $EA
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dex
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skip_if_zero:
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txa
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burn_out_smc:
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sta $4000,Y
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inc random_smc+1
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dey
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bpl burn_inner
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ldx HGR_X
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bne burn_loop
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rts
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;=====================
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copy_to_page1:
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ldx #0
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copy_loop:
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txa
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jsr HPOSN ; puts addr of line in A into GBASL:GBASH
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; ldx HGR_X
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lda GBASL
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sta copy_inner_smc+1
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lda GBASH
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eor #$60
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sta copy_inner_smc+2
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ldy #39
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copy_inner:
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lda (GBASL),Y
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tax
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lda color_lookup,X
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; sec ; or ora $80?
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ror_smc:
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; ror ; ROR = $6A 0110 1010
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; NOP = $EA 1110 1010
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copy_inner_smc:
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sta $2000,Y
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; lda ror_smc
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; eor $80
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; sta ror_smc
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dey
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bpl copy_inner
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ldx HGR_X
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inx
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cpx #192
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bne copy_loop
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rts
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color_lookup:
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.byte $00 ; 1 0 00 00 00 BBBB 0
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.byte $84 ; 1 0 00 01 00 BB0B 1
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.byte $90 ; 1 0 01 00 00 BOBB 2
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.byte $81 ; 1 0 00 00 01 BBBO 3
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.byte $91 ; 1 0 01 00 01 BOBO 4
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.byte $C4 ; 1 1 00 01 00 OBOB 5
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.byte $D1 ; 1 1 01 00 01 OOBO 6
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.byte $DA ; 1 1 01 01 01 OOOO 7
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.byte $F5 ; 1 1 11 01 01 OWOO 8
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.byte $DD ; 1 1 01 11 01 WOWO 9
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.byte $FE ; 1 1 11 01 11 OWOW 10
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.byte $DF ; 1 1 01 11 11 OOWW 11
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.byte $F5 ; 1 1 11 01 01 WWOO 12
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.byte $FD ; 1 1 11 11 01 WWWO 13
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.byte $DF ; 1 1 01 11 11 WOWW 14
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.byte $ff ; 1 1 11 11 11 WWWW 15
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