Simple AGC - Revision history

Thymo: Simple AGC is dead

2022-01-17T20:09:41Z

Simple AGC is dead

← Older revision		Revision as of 20:09, 17 January 2022
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	'''Project Apollo''' ~~has~~ its own implementation of the Apollo Guidance Computer (AGC) software in C++. Some of the real programs ~~are~~ simulated along with a number of programs which did not exist in the real AGC, but are useful in Orbiter.		'''Project Apollo''' used to have its own implementation of the Apollo Guidance Computer (AGC) software in C++. Some of the real programs were simulated along with a number of programs which did not exist in the real AGC, but are useful in Orbiter. Simple AGC was removed along with difficulty settings in NASSP 7.

	==Pre-Launch==		==Pre-Launch==

imported>Tschachim: Changed P16

2007-06-13T22:38:03Z

Changed P16

← Older revision		Revision as of 22:38, 13 June 2007
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	==Lunar Orbit Insertion==		==Lunar Orbit Insertion==

	To enter lunar orbit, simply enter VERB 37 NOUN 16 ENTER on the DSKY. This will display NOUN 19, showing the status of the burn required to enter Lunar orbit.		To enter lunar orbit, aim for a periapsis altitude of about 115 km and simply enter VERB 37 NOUN 16 ENTER on the DSKY about half an hour before periapsis. This will display NOUN 19, showing the status of the burn required to enter Lunar orbit.

	R1 will show the time to ignition, then the time to cutoff after ignition. R2 shows altitude in tenths of a kilometer, and R3 shows offplane distance in tenths of a kilometer.		R1 will show the time to ignition, then the time to cutoff after ignition. R2 shows altitude in tenths of a kilometer, and R3 shows offplane distance in tenths of a kilometer.

			The resulting orbit will be about 115 x 315 km. Apollo 11 and 12 then did a LOI2 burn to achieve a roughly circular orbit. To do that execute P16 again at about half an hour before next periapsis, the resulting orbit will be about 110 x 120 km. Apollo 14 and later didn't do a LOI2 burn but the DOI burn directly with the complete CSM/LM stack, the Descent Orbit Insertion (DOI) program P17 is used for that.

	==Descent Orbit Insertion==		==Descent Orbit Insertion==

	To enter a suitable orbit for the LEM to land at the programmed landing site, run Program 17 on either on the LM or CSM computer, for the LM, CSM, or docked pair. To start the program, use VERB 37 NOUN 17 ENTER.		To enter a suitable orbit for the LEM to land at the programmed landing site, run the Descent Orbit Insertion (DOI) Program 17 on either on the LM or CSM computer, for the LM, CSM, or docked pair. To start the program, use VERB 37 NOUN 17 ENTER.

	The DSKY will display NOUN 23, which shows the number of passes before landing in R1, the time to the plane change or secondary burn in R2, and the delta-V in R3, in units of 0.1m/s. The program will pick a burn time on the next possible orbit, if you want to delay it then use VERB 21 ENTER to update the number of passes in R1, then press PRO. To get a countdown to the burn, use VERB 16 ENTER.		The DSKY will display NOUN 23, which shows the number of passes before landing in R1, the time to the plane change or secondary burn in R2, and the delta-V in R3, in units of 0.1m/s. The program will pick a burn time on the next possible orbit, if you want to delay it then use VERB 21 ENTER to update the number of passes in R1, then press PRO. To get a countdown to the burn, use VERB 16 ENTER.

imported>Mark Grant: Lunar Orbit Insertion

2007-05-03T00:15:31Z

Lunar Orbit Insertion

← Older revision		Revision as of 00:15, 3 May 2007
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	While docked, the CSM may be able to draw power from the docked vessel. Run Prog 59 again and enter +00002 in R1 to run the power display program. This displays the power flow from the docked vessel to the CSM, and the power left in the docked vessel's batteries, if appropriate.		While docked, the CSM may be able to draw power from the docked vessel. Run Prog 59 again and enter +00002 in R1 to run the power display program. This displays the power flow from the docked vessel to the CSM, and the power left in the docked vessel's batteries, if appropriate.

			==Lunar Orbit Insertion==

			To enter lunar orbit, simply enter VERB 37 NOUN 16 ENTER on the DSKY. This will display NOUN 19, showing the status of the burn required to enter Lunar orbit.

			R1 will show the time to ignition, then the time to cutoff after ignition. R2 shows altitude in tenths of a kilometer, and R3 shows offplane distance in tenths of a kilometer.

	==Descent Orbit Insertion==		==Descent Orbit Insertion==

imported>Mark Grant: Descent Orbit Insertion from LazyD's docs.

2007-05-03T00:09:31Z

Descent Orbit Insertion from LazyD's docs.

← Older revision		Revision as of 00:09, 3 May 2007
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	While docked, the CSM may be able to draw power from the docked vessel. Run Prog 59 again and enter +00002 in R1 to run the power display program. This displays the power flow from the docked vessel to the CSM, and the power left in the docked vessel's batteries, if appropriate.		While docked, the CSM may be able to draw power from the docked vessel. Run Prog 59 again and enter +00002 in R1 to run the power display program. This displays the power flow from the docked vessel to the CSM, and the power left in the docked vessel's batteries, if appropriate.

			==Descent Orbit Insertion==

			To enter a suitable orbit for the LEM to land at the programmed landing site, run Program 17 on either on the LM or CSM computer, for the LM, CSM, or docked pair. To start the program, use VERB 37 NOUN 17 ENTER.

			The DSKY will display NOUN 23, which shows the number of passes before landing in R1, the time to the plane change or secondary burn in R2, and the delta-V in R3, in units of 0.1m/s. The program will pick a burn time on the next possible orbit, if you want to delay it then use VERB 21 ENTER to update the number of passes in R1, then press PRO. To get a countdown to the burn, use VERB 16 ENTER.

			The program doesn't attempt to get the apoapsis to be 110 km. It simply does a burn 195 degrees away from where the landing site will be after the number of passes entered, so as to make the flight path angle zero and have the proper periapsis 15 degrees before the landing site. Since we're going to land, the apoapsis doesn't matter too much.

			After the burn, you can run Program 18 to correct offplane errors.

	==Lunar Landing==		==Lunar Landing==

imported>Mark Grant: /* Verb, Noun and Program Summary */ - added more.

2007-05-03T00:04:23Z

Verb, Noun and Program Summary: - added more.

@@ Line 226: / Line 226: @@
 |14
 ||Desired delta-v
 |-
 |25
@@ Line 253: / Line 259: @@
 |50
 ||Apoapsis, periapsis, fuel percentage
 |-
 |62
-||Velocity information during launch
+||Velocity information during launch and landing
 |-
 |73
 ||Flight trajectory
 |-
 |94

imported>Mark Grant: Copied over some of the information on the landing program.

2007-05-02T23:14:42Z

Copied over some of the information on the landing program.

← Older revision		Revision as of 23:14, 2 May 2007
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	While docked, the CSM may be able to draw power from the docked vessel. Run Prog 59 again and enter +00002 in R1 to run the power display program. This displays the power flow from the docked vessel to the CSM, and the power left in the docked vessel's batteries, if appropriate.		While docked, the CSM may be able to draw power from the docked vessel. Run Prog 59 again and enter +00002 in R1 to run the power display program. This displays the power flow from the docked vessel to the CSM, and the power left in the docked vessel's batteries, if appropriate.

			==Lunar Landing==

			Prior to initiating a descent to the moon, the orbit plane needs to come fairly close (<24 km) to the landing site (see P18), and have a periapsis altitude of between 10 and 20 km which is roughly above the landing site (see P17). This translates to radius from moon center of 1748 to 1758 km. When your orbit is correct and the LM is approaching the base about 1000 km away, you can start P63.

			On the DSKY, enter VERB 37 NOUN 63 ENTER. If [[REALISM]] is set to zero, the rest of the landing will be automatic. Otherwise follow the instructions below.

			The DSKY will display NOUN 89, showing the landing latitude in R1 and longitude / 2 in R2. Press PRO and the DSKY will show NOUN 61 with the time to go in R1, time from ignition in R2, and crossrange in tenths of kilometers in R3. If the cross-range is too high, you can thrust to improve it before the landing. Press PRO when you're happy.

			This will display NOUN 33, showing the time to ignition; hours in R1, minutes in R2 and seconds and hundredths of seconds in R3. Press PRO to continue.

			The DSKY will now display VERB 50 NOUN 18, showing the pitch, roll and yaw angles required for the burn. Press PRO to confirm the orientation.

			At Ignition-35 seconds the DSKY blanks, then at Ignition-30 seconds switches to NOUN 62, which displays velocity in R1, time from ignition (in seconds) in R2, and required delta-V in R3.

			At Ignition-5 seconds VERB 99 NOUN 62 flashes, requesting the astronaut to confirm the burn. Press PRO to confirm, and ensure you do it before the count reaches zero.

			At ignition, NOUN 63 is displayed, with R1 showing the delta altitude from the landing site, R2 the altitude rate, and R3 the altitude.

	==Generic programs and data==		==Generic programs and data==

imported>Mark Grant: /* Verb, Noun and Program Summary */ - added new programs from LazyD's documentation. Not sure which of these are LEM-only other than the obvious ones.

2007-05-02T23:06:11Z

Verb, Noun and Program Summary: - added new programs from LazyD's documentation. Not sure which of these are LEM-only other than the obvious ones.

@@ Line 266: / Line 266: @@
 |11
 ||Launch control
 |-
 |15
 ||TLI burn
 |-
 |33
-||Orbit altitude control
+||CDH: Constant Delta Height
 |-
 |63
-||LEM: descent autopilot setup
+||LEM: LM PDI Braking
 |-
 |68
-||LEM: landing confirmation
+||LEM: Landing confirmation
 |}
 [[Category:Apollo Guidance Computer]]

imported>Mark Grant: /* TLI Burn */ - basic info on docked vessel control

2006-11-26T16:21:51Z

TLI Burn: - basic info on docked vessel control

← Older revision		Revision as of 16:21, 26 November 2006
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	The countdown on the DSKY will stop at zero, so press PRO. That will give you a flashing VERB 37 to remind you to change programs, at this point you might as well enter NOUN 00 ENTER to switch the AGC to idle, or NOUN 06 ENTER and then PRO to put it in standby mode.		The countdown on the DSKY will stop at zero, so press PRO. That will give you a flashing VERB 37 to remind you to change programs, at this point you might as well enter NOUN 00 ENTER to switch the AGC to idle, or NOUN 06 ENTER and then PRO to put it in standby mode.

			==Docked Vessel Control==

			The fictional Prog 59 is a generic 'docked vessel control' program which allows the Command Module AGC to perform various functions with docked vessels that support remote control; note that this is restricted to future fictional vessels and these programs do not work with the LEM.

			Program 59 has a number of sub-programs, which perform the various functions. They are selected by entering a value into the R1 regsiter and pressing PRO.

			Enter +00001 then press PRO to start and stop fuel venting... the AGC will display the amount of fuel left in the docked vessel as it's vented.

			While docked, the CSM may be able to draw power from the docked vessel. Run Prog 59 again and enter +00002 in R1 to run the power display program. This displays the power flow from the docked vessel to the CSM, and the power left in the docked vessel's batteries, if appropriate.

	==Generic programs and data==		==Generic programs and data==

imported>Mark Grant: PROG -> PRO

2006-11-26T16:17:08Z

PROG -> PRO

imported>Mark Grant: /* Program Checksums */ - bit more info.

2006-11-25T18:41:44Z

Program Checksums: - bit more info.

← Older revision		Revision as of 18:41, 25 November 2006
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	In Orbiter this is absolutely useless in this version of the AGC (they're actually the checksums of one version of the Colossus software), but in a real Apollo this was an important tool for verifying that the correct programs were loaded into the AGC core memory. In the [[Virtual AGC]] this could also be useful to determine which version of the AGC software is loaded by examining the checksums.		In Orbiter this is absolutely useless in this version of the AGC (they're actually the checksums of one version of the Colossus software), but in a real Apollo this was an important tool for verifying that the correct programs were loaded into the AGC core memory. In the [[Virtual AGC]] this could also be useful to determine which version of the AGC software is loaded by examining the checksums.

	In the DSKY display, the first line is the checksum, the second line is the bank number and the third is more checksum: to be valid, the first checksum must be equal to the bank number or negative bank number (in octal), and the second checksum gives more information.		In the DSKY display, the first line is the checksum, the second line is the bank number and the third is more checksum: to be valid, the first checksum must be equal to the bank number or negative bank number (in octal), and the second checksum gives more information; technically, it's the contents of the extra word of data which is appended to the memory bank in order to make the checksum valid.

	To display more banks, use VERB 33 ENTER to cycle through them. When you reach the end of the memory banks the program will cycle back to bank zero again.		To display more banks, use VERB 33 ENTER to cycle through them. When you reach the end of the memory banks the program will cycle back to bank zero again.

← Older revision		Revision as of 16:17, 26 November 2006
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	If you get bored, just hit 10x time acceleration briefly. Once the lights have turned off, the computer goes into standby mode with displays blanked and just the STDBY light lit. If you start the engines it will automatically start up as they ignite.		If you get bored, just hit 10x time acceleration briefly. Once the lights have turned off, the computer goes into standby mode with displays blanked and just the STDBY light lit. If you start the engines it will automatically start up as they ignite.

	However, if you prefer to do things the 'proper' way, press the ~~PROG~~ key on the DSKY to start the computer. VERB 37 will flash on the display: this is the 'change program' verb: the computer is currently idling in program 00, but suggesting that you enter a new program to run.		However, if you prefer to do things the 'proper' way, press the PRO key on the DSKY to start the computer. VERB 37 will flash on the display: this is the 'change program' verb: the computer is currently idling in program 00, but suggesting that you enter a new program to run.
	So press 'NOUN', then 0, then 1, then ENTER.		So press 'NOUN', then 0, then 1, then ENTER.

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	The program will start with a flashing VERB 06 NOUN 29. This shows the launch azimuth in hundredths of a degree on the top line of the display, and allows you to change it from the historically correct value if you choose.		The program will start with a flashing VERB 06 NOUN 29. This shows the launch azimuth in hundredths of a degree on the top line of the display, and allows you to change it from the historically correct value if you choose.

	To update the information on these lines you need to change the displayed values, then press ~~PROG~~ to enter them into the AGC. To update the first line, use VERB 21 ENTER, for the second VERB 22 ENTER , for the third VERB 23 ENTER. To update the first and second in sequence use VERB 24 ENTER, for all three use VERB 25 ENTER.		To update the information on these lines you need to change the displayed values, then press PRO to enter them into the AGC. To update the first line, use VERB 21 ENTER, for the second VERB 22 ENTER , for the third VERB 23 ENTER. To update the first and second in sequence use VERB 24 ENTER, for all three use VERB 25 ENTER.

	When you enter data the DSKY will blank the appropriate line. Press '+' or '-' to begin data entry (octal entry is not yet supported), then type in the digits, with preceding zeros when required. Once you type in all five digits, the value will be saved ready to be passed to the AGC. Note that if you make a mistake while entering the number, you can press CLR to clear the entry and try again.		When you enter data the DSKY will blank the appropriate line. Press '+' or '-' to begin data entry (octal entry is not yet supported), then type in the digits, with preceding zeros when required. Once you type in all five digits, the value will be saved ready to be passed to the AGC. Note that if you make a mistake while entering the number, you can press CLR to clear the entry and try again.
	So, you can use VERB 21 ENTER to change the azimuth value, then press ~~PROG~~ to accept the value being displayed. Alternatively, if you're happy with the value, use VERB 33 ENTER to 'proceed without data': the computer will then use the displayed azimuth value for the launch.		So, you can use VERB 21 ENTER to change the azimuth value, then press PRO to accept the value being displayed. Alternatively, if you're happy with the value, use VERB 33 ENTER to 'proceed without data': the computer will then use the displayed azimuth value for the launch.

	Either way, the computer will respond with a flashing VERB 06 NOUN 44, displaying the desired apogee and perigee in tens of meters. Again, update them if desired, or use VERB 33 ENTER to continue.		Either way, the computer will respond with a flashing VERB 06 NOUN 44, displaying the desired apogee and perigee in tens of meters. Again, update them if desired, or use VERB 33 ENTER to continue.
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	The computer will respond with a flashing VERB 06 NOUN 33, displaying the time to liftoff: hours on the first line, minutes on the second line, and hundredths of a second on the third line.		The computer will respond with a flashing VERB 06 NOUN 33, displaying the time to liftoff: hours on the first line, minutes on the second line, and hundredths of a second on the third line.

	If you wish to change your launch time, update the values on the display, then press ~~PROG~~ to load them into the computer. If you want to monitor the launch time, enter VERB 16 ENTER, which will switch to updating the countdown time roughly twice per second.		If you wish to change your launch time, update the values on the display, then press PRO to load them into the computer. If you want to monitor the launch time, enter VERB 16 ENTER, which will switch to updating the countdown time roughly twice per second.

	==Launch==		==Launch==
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	The computer will respond with a flashing VERB 06 NOUN 33. This displays the time to ejection in hours (top line), minutes (middle line) and hundredths of seconds (bottom line).		The computer will respond with a flashing VERB 06 NOUN 33. This displays the time to ejection in hours (top line), minutes (middle line) and hundredths of seconds (bottom line).
	Skip time until the time to ejection in the MFD display is around 1300 seconds. Now enter VERB 22 ENTER to change the value of the minutes field. Press '+00020' to indicate twenty minutes, and wait. Watch the time to ejection count down and when it hits 1200 seconds, press ~~PROG~~ to update the time for the computer.		Skip time until the time to ejection in the MFD display is around 1300 seconds. Now enter VERB 22 ENTER to change the value of the minutes field. Press '+00020' to indicate twenty minutes, and wait. Watch the time to ejection count down and when it hits 1200 seconds, press PRO to update the time for the computer.
	You've now told the program when to make the TLI burn. The display will switch to VERB 06 NOUN 14. This is one line, the delta-V for the burn.		You've now told the program when to make the TLI burn. The display will switch to VERB 06 NOUN 14. This is one line, the delta-V for the burn.

	Press VERB 21 ENTER to update the delta V. Now press '+' and enter the value with appropriate leading zeros. For example, if your burn delta-V is going to be 3183 m/s, enter '+03183'. When you're done, press ~~PROG~~.		Press VERB 21 ENTER to update the delta V. Now press '+' and enter the value with appropriate leading zeros. For example, if your burn delta-V is going to be 3183 m/s, enter '+03183'. When you're done, press PRO.

	The computer will perform some calculations and respond with a flashing VERB 06 NOUN 95. This shows the burn details. The top line is the time to engine ignition, the middle line the delta-V, and the bottom line the velocity for engine cutoff. The time to ignition will not be the value you just entered, as it allows for the burn duration and engine startup.		The computer will perform some calculations and respond with a flashing VERB 06 NOUN 95. This shows the burn details. The top line is the time to engine ignition, the middle line the delta-V, and the bottom line the velocity for engine cutoff. The time to ignition will not be the value you just entered, as it allows for the burn duration and engine startup.
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	When the engine cuts off, you should be within about 1 m/s of the correct velocity. If you're further out you can probably fine-tune with the SM RCS once you've seperated the LM from the SIVB.		When the engine cuts off, you should be within about 1 m/s of the correct velocity. If you're further out you can probably fine-tune with the SM RCS once you've seperated the LM from the SIVB.

	The countdown on the DSKY will stop at zero, so press ~~PROG~~. That will give you a flashing VERB 37 to remind you to change programs, at this point you might as well enter NOUN 00 ENTER to switch the AGC to idle, or NOUN 06 ENTER and then ~~PROG~~ to put it in standby mode.		The countdown on the DSKY will stop at zero, so press PRO. That will give you a flashing VERB 37 to remind you to change programs, at this point you might as well enter NOUN 00 ENTER to switch the AGC to idle, or NOUN 06 ENTER and then PRO to put it in standby mode.

	==Generic programs and data==		==Generic programs and data==

	Program 06 is the AGC standby program. Enter VERB 37 NOUN 06 ENTER to switch to program 06. It will then flash VERB 50 NOUN 25: this is a generic message from the computer telling you to perform a checklist action... the appropriate action will be displayed on the first line. In this case it is '00062', which means 'press the ~~PROG~~ key to put the AGC into standby'. Press that key and the displays will be blanked and the STDBY light come on. Press the ~~PROG~~ key again to bring the AGC out of standby.		Program 06 is the AGC standby program. Enter VERB 37 NOUN 06 ENTER to switch to program 06. It will then flash VERB 50 NOUN 25: this is a generic message from the computer telling you to perform a checklist action... the appropriate action will be displayed on the first line. In this case it is '00062', which means 'press the PRO key to put the AGC into standby'. Press that key and the displays will be blanked and the STDBY light come on. Press the PRO key again to bring the AGC out of standby.

	Noun 38 shows the time since the AGC was booted. Noun 73 shows the altitude, velocity and angle of attack, the latter in hundredths of a degree.		Noun 38 shows the time since the AGC was booted. Noun 73 shows the altitude, velocity and angle of attack, the latter in hundredths of a degree.
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	'Erasable Memory' was the AGC equivalent of modern RAM. The program was stored in fixed core memory, while data which might change (e.g. Current time, landing site location) was stored in erasable memory. Of course this meant that the astronauts needed a way to examine and change the memory.		'Erasable Memory' was the AGC equivalent of modern RAM. The program was stored in fixed core memory, while data which might change (e.g. Current time, landing site location) was stored in erasable memory. Of course this meant that the astronauts needed a way to examine and change the memory.

	To examine memory locations, use VERB 01 NOUN 02 ENTER. This will switch the R2 display to octal (base-8) and blank the R1 display, while flashing the verb and noun display to remind you that you need to do something. Enter a memory location in R1, and press ~~PROG~~. The value of the erasable memory location will be displayed in R2, and the program will blank R1 again so you can enter a new memory location.		To examine memory locations, use VERB 01 NOUN 02 ENTER. This will switch the R2 display to octal (base-8) and blank the R1 display, while flashing the verb and noun display to remind you that you need to do something. Enter a memory location in R1, and press PRO. The value of the erasable memory location will be displayed in R2, and the program will blank R1 again so you can enter a new memory location.

	If, instead, you want to monitor a memory location as the data changes, use VERB 11 NOUN 02. As above, enter a memory address in R1 and press ~~PROG~~. Rather than give you the option of entering another location, the verb and noun display will stop flashing and R2 will be continually updated with the contents of the memory location. Location (octal) 00025 is a good one to use, as it simulates the 10 millisecond timer on the real AGC.		If, instead, you want to monitor a memory location as the data changes, use VERB 11 NOUN 02. As above, enter a memory address in R1 and press PRO. Rather than give you the option of entering another location, the verb and noun display will stop flashing and R2 will be continually updated with the contents of the memory location. Location (octal) 00025 is a good one to use, as it simulates the 10 millisecond timer on the real AGC.

	Of course, since the memory is just simulated, this doesn't really help a huge amount. However, you can view various variables that control the AGC operation if you know how the program works, and will be able to change the program's operation by changing those variables.		Of course, since the memory is just simulated, this doesn't really help a huge amount. However, you can view various variables that control the AGC operation if you know how the program works, and will be able to change the program's operation by changing those variables.