Register R1Īt this time, only the first register is to be altered, in this case to "11103". This table explains the meaning of each digit in two of them. The crew can configure the DAP's status by changing digits within registers in the computer's memory. Control of which thruster to fire when comes from the DAP, a software routine running in the computer. The physical forces that turn the spacecraft to the correct attitude are provided by the firing of thrusters mounted around the Service Module. Throughout most of the mission, the attitude of the spacecraft is controlled so that the crew can properly carry out their various tasks, like sighting stars, photographing the lunar surface or protecting the spacecraft from extremes of temperature. At 3 hours and 5 minutes into the flight, this seems to be a convenient stopping point for the action right now. We are now seeing our first midcourse charts, early estimates of what we will be working with, numbers at midcourse, and like so many of our data displays, by the time we get locked up on it with our own eye balls it moves to another channel. That spacecraft right now, in relation to the Earth, is just south of the Goldstone station which has it in solid lock. Now 934, 961, and every 10 seconds it seems to be adding about 30 to 40 miles. It's now 32,418 feet per second, and we'll continue to see that slight lowering in the velocity reading and a constant elevation of the apogee. At the same time we are already beginning to see the velocity begin to recede slightly.
Our present ground elapsed time into the flight is 3 hours, 3 minutes. Now it's a good solid trace coming to us through Goldstone.
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