| Command | Meaning |
|---|---|
| INV | Inverts every bit in the source WORD and stores the result. |
| NEG | Reverses the sign of the source value and stores the result. |
| H2D | Interprets a source WORD containing four BCD digits as a decimal integer and stores the result. |
| D2H | Converts a decimal integer from 0 to 9999 into four-digit BCD and stores it in a WORD. |