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__asm__("movb _attr,%%ah\n\t"
        "movw %%ax,%1\n\t"
          ::"a" (c),"m" (*(short *)pos)
          :"ax");
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outb_p(14, video_port_reg);
outb_p(0xff&((pos-video_mem_base)>>9), video_port_val);
outb_p(15, video_port_reg);
outb_p(0xff&((pos-video_mem_base)>>1), video_port_val);
sti();
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