VGA_SEQUENCER_INDEX
gISA->write_io_16(VGA_SEQUENCER_INDEX, (1 << (plane + 8)) | 0x02);
out16((15 << 8) | 0x02, VGA_SEQUENCER_INDEX);
out16((1 << 8) | 0x02, VGA_SEQUENCER_INDEX);
out16((2 << 8) | 0x02, VGA_SEQUENCER_INDEX);
out16((4 << 8) | 0x02, VGA_SEQUENCER_INDEX);
out16((8 << 8) | 0x02, VGA_SEQUENCER_INDEX);
out16((15 << 8) | 0x02, VGA_SEQUENCER_INDEX);