165 lines
2.1 KiB
ArmAsm
165 lines
2.1 KiB
ArmAsm
;=============================
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; show VMW splash screen
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;=============================
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opening:
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jsr normal_text
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lda #100
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sta MATCH
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jsr draw_logo
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jsr page_flip
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;clc
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;infinity:
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;bcc infinity
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; Draw the shining band
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lda #0
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sta MATCH
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shine_loop:
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jsr draw_logo
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jsr page_flip
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inc MATCH
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lda MATCH
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cmp #30
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bne shine_loop
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; Done, print string
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lda #<(vmwsw_string)
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sta OUTL
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lda #>(vmwsw_string)
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sta OUTH
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jsr move_and_print ; print("A VMW SOFTWARE PRODUCTION");
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jsr page_flip
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jsr wait_until_keypressed
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rts
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;=====================
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; display part of logo
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;=====================
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;
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draw_segment:
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lda #0
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sta LOGO_LOOP
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segment_loop:
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lda YADD
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clc
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adc YY
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sta YY ; yy=yy+yadd
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lda COLOR1
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sta COLOR ; color=COLOR1
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lda MATCH ; if (ram[XX]==ram[MATCH])
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cmp XX
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bne nocolmatch1
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lda COLOR ; color_equals(ram[COLOR1]*3);
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clc
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adc COLOR1
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adc COLOR1
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sta COLOR
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nocolmatch1:
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lda YY
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sta V2
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lda XX
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clc
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adc #9
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tay
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lda #10
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tax
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jsr vlin ; X,V2 at Y vlin(10,ram[YY],9+ram[XX]);
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lda COLOR2
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sta COLOR ; color=COLOR2
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lda MATCH ; if (ram[XX]==ram[MATCH])
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cmp XX
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bne nocolmatch2
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lda COLOR ; color_equals(ram[COLOR2]*3);
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clc
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adc COLOR2
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adc COLOR2
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sta COLOR
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nocolmatch2:
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lda #34
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sta V2
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lda XX
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clc
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adc #9
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tay
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lda YY
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cmp #34
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beq skip_bottom ; if (ram[YY]==34) skip
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tax
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jsr vlin ; X,V2 at Y vlin(ram[YY],34,9+ram[XX]);
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skip_bottom:
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inc XX ; ram[XX]++;
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inc LOGO_LOOP
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lda LOGO_LOOP
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cmp #4
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bne segment_loop
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lda YADD ; ram[YADD]=-ram[YADD];
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eor #$ff
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clc
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adc #1
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sta YADD
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rts
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;=================
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; display VMW logo
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;=================
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;
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draw_logo:
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lda #0
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sta XX ; start of logo
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lda #10
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sta YY ; draw at Y=10
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lda #6
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sta YADD ; step of 6
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lda #$00
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sta COLOR2
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lda #$11
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sta COLOR1 ; first colors are red/black
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jsr draw_segment
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lda #$44
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sta COLOR2 ; now red/green
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jsr draw_segment
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lda #$22
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sta COLOR1 ; now green/blue
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jsr draw_segment
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jsr draw_segment
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jsr draw_segment
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lda #$00
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sta COLOR2 ; now blue/black
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jsr draw_segment
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rts
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vmwsw_string:
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.byte 8,20,"A VMW SOFTWARE PRODUCTION",0
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