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Multivalue Logic System 9-value support
https://en.wikipedia.org/wiki/IEEE_1164
| Character | Value |
|---|---|
| 'U' | uninitialized |
| 'X' | strong drive, unknown logic value |
| '0' | strong drive, logic zero |
| '1' | strong drive, logic one |
| 'Z' | high impedance |
| 'W' | weak drive, unknown logic value |
| 'L' | weak drive, logic zero |
| 'H' | weak drive, logic one |
| '-' | don't care |
https://github.com/wavedrom/vcd/issues/28

0 1 X L H W U Z - x l h w u z
A) Current status B) GTKwave