| Acronym | Meaning |
| DCSU | Digital Computer Switching Unit |
| SC | Statement Of Compatibility |
| IVE | Interface Verification EquiPr-nent |
| OPTB | Operational Program Time Base |
| SPIF | Standard Payload Interface Facility |
| INTERPRETIV | Interpretive Co ' |
| DAB | Data Acquisition Bus |
| GSA | General Services Administration |
| RVCF | Remote Vehicle Checkout Facility |
| M | PTSMultipurpose Tool Set |