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Project Apollo - NASSP 6.4.3 released!
http://nassp.sf.net
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Author Topic: LM status...  (Read 160616 times)
vrouleau
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« Reply #390 on: March 14, 2012, 07:26:55 PM »

WOW !! awesome Sherlock. I spent so much time look at the agc source code to understand why but could find it. I did the commit for the PAMFD  other SV upload.

I still need to improve the RR to set the porper operation angle based on RR operation mode. For e rolling tape, I firged I could do a simple Bitmap that can be offset with a scale and 000 digits representing thousand feet range and that just use superimpose single digits on it reprensing tousand unit, 10 thousand and 100 thousands units.
.
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barry
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« Reply #391 on: March 14, 2012, 08:13:59 PM »

Slightly off-topic, but if you are working on the RR - perhaps you can also emulate the hardware interrupt bug that caused the "1201"s and "1202"s that actually happened during Apollo 11.

see: http://www.doneyles.com/LM/Tales.html

Look around for the following:
Quote
The CDU interface counters in the LGC were incremented or decremented by means of external commands that were processed inside the computer as increment or decrement operations with names like PINC and MINC. Like the LGC's programmable operations, these took time, in this case one memory cycle of 11.7 microseconds, each. Moving at their maximum rate, the RR CDU counters consumed approximately 15% of the available computation time. At the time, conservatively, we assumed the time drain (called TLOSS) was about 13%, which was consistent with the behavior that was observed.

As I understand it, the RR CDU hardware chewed up too much real-time, and caused the system to recursively handle events, which ate up the free VACs..
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dseagrav
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« Reply #392 on: March 14, 2012, 08:50:54 PM »

The problem with that is that the exact loading is not strictly deterministic - Even if I faked up the time loss, it would be really difficult to get the alarms at the exact time it happened.
Maybe after everything works properly we can look into simulating faults, but I'm not interested in it right now.

Edit: Solved the LR issue, it was a typo on my part that caused it to intermittently fail.
The LR works exactly the same way the RR does.
I mapped out the radar range unit channels, here's the list:

Code:
ABC WHAT
000 unused/not observed
100 LR VELOCITY X
010 RR RANGE RATE
110 LR VELOCITY Z
001 RR RANGE
101 LR VELOCITY Y
011 unused/not observed
111 LR RANGE
« Last Edit: March 14, 2012, 11:17:04 PM by dseagrav » Logged
dseagrav
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« Reply #393 on: March 18, 2012, 08:16:18 PM »

There are some inconsistencies in driving activity that I am investigating; Antenna drive commands don't seem to work as expected.
I'm picking it apart and will post more when I figure it out.

Edit: Whatever happened to the LM ECS bitmaps that were being worked on?
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NoName
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« Reply #394 on: March 19, 2012, 09:22:14 PM »

Whatever happened to the LM ECS bitmaps that were being worked on?

I am drawing the Water Control Module right now. Looks nice so far. I expect to complete my work on the LM panel graphics this week.

I'll post a preview soon...
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vrouleau
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« Reply #395 on: March 20, 2012, 06:15:13 AM »

I had the moving Tapemeter for the radar range implemented.  Does anybody know what the portion below 0 feet looked like on the tape? Was it just black. Tried to find images on the internet...
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dseagrav
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« Reply #396 on: March 20, 2012, 11:05:11 AM »

Looks like it's just black. See http://www.hq.nasa.gov/office/pao/History/alsj/a11/AS11-36-5389HR.jpg
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NoName
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« Reply #397 on: March 20, 2012, 11:15:45 AM »

The tapemeter already exists. It's just not yet committed Tongue

I could commit it. But I don't know if the bitmap is correct. It goes from -700 fps to +700 fps and from 0 up to 60,000 feet. Is this correct?
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dseagrav
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« Reply #398 on: March 20, 2012, 11:18:08 AM »

No, it's supposed to turn to nautical miles at 120,000 feet and go out to 400 nautical miles.
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NoName
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« Reply #399 on: March 20, 2012, 11:20:04 AM »

No, it's supposed to turn to nautical miles at 120,000 feet and go out to 400 nautical miles.
I'm at work so I don't have all my notes.


Ah yes. It was just too long ago we were talking about. I didn't have time during the last month. But I am fully back.

I'll finish it. "Only" another 60k feet and then up to 400 nm ROTFL
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vrouleau
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« Reply #400 on: March 20, 2012, 12:09:13 PM »

Ok, I stop working on it then.
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retro
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« Reply #401 on: March 20, 2012, 01:27:40 PM »

yes those figures are correct
0 to 120,000 then changes to NM to 400
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NoName
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« Reply #402 on: March 20, 2012, 01:41:12 PM »

Ok, I stop working on it then.

Do you need the bitmap urgently? I could put it on top of my list and commit it before I commit all the other new LM bitmaps.
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NoName
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« Reply #403 on: March 20, 2012, 01:41:35 PM »

yes those figures are correct
0 to 120,000 then changes to NM to 400

Thanks.
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vrouleau
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« Reply #404 on: March 20, 2012, 01:49:41 PM »

Ok, I stop working on it then.

Do you need the bitmap urgently? I could put it on top of my list and commit it before I commit all the other new LM bitmaps.
Well no, as I was about ready to commit myself the range tape meter. I had done the tapemeter (in feet only , I did not implement the transittion to NM) and the digits to print out the range in ,000 increments.  Can you confirm that you worked on a fully moving tapemeter that responds to RR radar values? or just the bitmaps? I've got the whole thing working but did not commit. I you just worked on the bitmap, then I'll keep the display logic code.
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