| Acronym | Meaning |
| NMCM | Not Mission Capable Maintenance |
| ACS | Access |
| EMSP | Enhanced Mod Signal Processor (an/uys-2 [xn-1](v)) |
| HP | Hewlett Packard |
| HC | Hazardous Code |
| VDD | Version Description Document |
| XMIT | Transmit |
| PCA | Physical Configuration Audit |
| MP/M | Multiprogramming Control Program For Microprocessors |
| MTM | Multi-task Monitor |