65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
#include <c64/vic.h>
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#include <c64/rasterirq.h>
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#include <string.h>
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const char Text[] =
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S"LABORUM RERUM QUO. QUASI IN, SEQUI, TENETUR VOLUPTATEM RERUM "
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S"PORRO NON ET MAIORES ALIAS ODIO EST EOS. MAGNAM APERIAM CUM ET "
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S"ESSE TEMPORE ITAQUE TEMPORA VOLUPTAS ET IPSAM IPSAM EARUM. ID "
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S"SUSCIPIT QUIA RERUM REPREHENDERIT ERROR ET UT. DOLOR ID "
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S"CORPORIS, EOS? UNDE VERO ISTE QUIA? EAQUE EAQUE. IN. AUT ID "
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S"EXPEDITA ILLUM MOLESTIAS, ";
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// Raster interrupt command structure for change to scrolled and back
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RIRQCode scroll, restore;
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int x;
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// Loop through text
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__interrupt void doscroll(void)
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{
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vic.color_border++;
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// Update raster IRQ for scroll line with new horizontal scroll offset
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rirq_data(&scroll, 1, 7 - (x & 7));
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// Copy scrolled version of text when switching over char border
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if ((x & 7) == 0)
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memcpy((char *)0x0400 + 40 * 24, Text + ((x >> 3) & 255), 40);
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x++;
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vic.color_border--;
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}
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int main(void)
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{
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// initialize raster IRQ
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rirq_init(true);
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// Build switch to scroll line IRQ
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rirq_build(&scroll, 2);
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// Delay for one line to get to right border
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rirq_delay(&scroll, 11);
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// Change control register two with this IRQ
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rirq_write(&scroll, 1, &vic.ctrl2, 0);
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// Put it onto the scroll line
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rirq_set(0, 49 + 24 * 8, &scroll);
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// Build the switch to normal IRQ
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rirq_build(&restore, 2);
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// re-enable left and right column and reset horizontal scroll
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rirq_write(&restore, 0, &vic.ctrl2, VIC_CTRL2_CSEL);
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// call scroll copy code
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rirq_call(&restore, 1, doscroll);
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// place this at the top of the screen before the display starts
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rirq_set(1, 250, &restore);
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// sort the raster IRQs
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rirq_sort();
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// start raster IRQ processing
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rirq_start();
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return 0;
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}
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