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To disable blinking:

1. read from 0x3DA to reset the register index latch
2. write 0x30 to 0x3C0 to set the register index
3. read from 0x3C1
4. AND the read byte from step 3 with 0xF7 to clear the blink bit flag
5. write new value to 0x3C0 to set the new value