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    /* Initialize the software structure. */   
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    /* Initialize the software structure. */   
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    ega_base = base;
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    ega_base = base;
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    backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
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    backbuf = (uint8_t *) malloc(SCREEN * 2, 0);
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    if (!backbuf)
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    if (!backbuf)
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        panic("Unable to allocate backbuffer.\n");
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        panic("Unable to allocate backbuffer.");
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    videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
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    videoram = (uint8_t *) hw_map(videoram_phys, SCREEN * 2);
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    /* Clear the screen and set the cursor position. */
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    /* Clear the screen and set the cursor position. */
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    memsetw(videoram, SCREEN, 0x0720);
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    memsetw(videoram, SCREEN, 0x0720);