| Abbreviation | Definition |
|---|---|
| DEC | DECimal |
| DEC | Decrement |
| DECA | Digital Electronic Control Assembly |
| DEI | Disk Eject Immediate |
| DERB | Dis-assemble Resource Bundle command |
| DF | Direction Flag |
| DF | Don't Fragment |
| DH | Data High |
| DHAM | Detroit-Hamtramck AsseMbly plant |
| DI | Deletion and Insertion |
| DI | Direct Instruction |
| DIAC | Delft Intelligent Assembly Cell |
| DIDO | Digital In, Digital Out |
| DIM | Declare In Memory |
| DIM | Declare Into Memory |
| DIV | Divide, Unsigned |
| DJNZ | Decrease Jump Not Zero |
| DJNZ | Decrement Jump if Not Zero |
| DKP | Disavow Knowledge of Programmer |
| DL | Data Left |