2018-01-21 20:55:01 +00:00
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const pointer screen = $400
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const byte row = 15
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byte letter_index
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void main () {
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2018-12-17 10:13:01 +00:00
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#if CBM_64_CRT
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vic_bg_color0 = blue
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vic_border = light_blue
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vic_cr1 = $9b
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vic_mem = $15
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vic_cr2 = $c8
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#endif
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2018-01-21 20:55:01 +00:00
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letter_index = 0
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disable_irq()
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init_screen()
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main_loop()
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}
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void init_screen() {
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byte i
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for i,0,paralleluntil,250 {
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screen[i+000] = logo[i-000]
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screen[i+250] = logo[i+250]
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screen[i+500] = logo[i+500]
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screen[i+750] = logo[i+750]
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c64_color_ram[i+000] = logo_colours[i+000]
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c64_color_ram[i+250] = logo_colours[i+250]
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c64_color_ram[i+500] = logo_colours[i+500]
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c64_color_ram[i+750] = logo_colours[i+750]
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}
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}
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void main_loop() {
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static byte scroll
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scroll = 7
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while true {
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while vic_raster != row * 8 - 1 + 50 {}
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stabilize(8)
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vic_38_columns()
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vic_set_scroll(scroll, 3)
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while vic_raster != row * 8 + 7 + 50 {}
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stabilize(20)
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vic_40_columns()
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vic_set_scroll(0,3)
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if scroll == 0 {
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scroll = 7
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hardscroll()
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} else {
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scroll -= 1
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}
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}
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}
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asm void stabilize(byte x){
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burn:
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DEX
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BNE burn
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RTS
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}
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void hardscroll() {
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byte i
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for i,0,until,39 {
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screen[40 * row + i] = screen[40 * row + i + 1]
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}
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screen[40 * row + 39] = scroll_text[letter_index]
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letter_index += 1
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if letter_index == scroll_text.length {
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letter_index = 0
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}
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}
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array scroll_text = [
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"this is a simple scroller demo written in millfork. " scr,
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"as you can see, you don't need assembly to do simple effects. " scr,
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" " scr
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]
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array logo = [
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,
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32,32,32,32,32,108,123,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,108,224,224,123,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,225,97,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,225,97,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,108,32,32,32,225,97,32,225,252,108,224,32,251,236,32,225,97,32,32,225,97,32,32,225,236,226,126,108,236,251,123,225,236,251,123,225,97,254,126,
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108,224,98,98,98,254,97,32,225,236,236,224,32,225,97,32,225,97,32,32,225,97,32,32,225,252,123,32,225,97,225,97,225,252,254,126,225,224,126,32,
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124,224,226,226,226,226,126,32,225,97,32,224,32,225,97,32,225,97,32,32,225,97,32,32,225,97,32,32,225,97,225,97,225,236,252,32,225,236,252,32,
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32,124,32,32,32,32,32,32,124,126,32,226,32,226,226,32,124,226,226,126,124,226,226,126,124,126,32,32,32,226,226,32,124,126,124,126,124,126,124,126,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,82,70,64,68,69,68,64,70,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,
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32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32,32
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]
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array logo_colours = [
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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14,14,14,14,14,5,5,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,5,5,5,5,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,5,5,5,14,14,14,0,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,5,5,14,0,14,0,0,14,0,14,0,0,0,14,0,0,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,5,14,14,14,5,5,14,0,0,0,0,14,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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5,5,5,5,5,5,5,14,0,0,0,0,14,0,0,14,0,0,14,14,0,0,14,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,14,
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5,5,5,5,5,5,5,14,0,0,0,0,14,0,0,14,0,0,0,0,0,0,14,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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14,5,5,14,14,14,14,14,0,0,14,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,0,14,14,14,0,0,0,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,
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14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14
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]
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