| Acronym | Meaning |
 | MTO | Master Timing Oscillator |
| MCIU | Manipulator Controller Interface Unit |
| HSS | High Speed Reader |
| TB | Toggle Buffer |
| SHS | Simulation Hardware System |
| CE | Change Evaluation |
| CHCS | Cabin Humidity Control Subsystem |
| SOA | RShuttle Orbital Applications And Requirements |
| CICU | Computer Interface Control Unit |
| NSI-I | NASA Standard Initiator-Type I (was SMSI) |
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