You are not logged in. Your edit will be placed in a queue until it is peer reviewed.
We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.
-
So the answer is that the wire would (unless the problem was transient) still be broken and the memory location thus unusable. What happens next would depend on where the break was. But I don't really see a practical way to proceed. Could the crew, during a mission, locate the fault and avoid it? Can a single address be avoided, or would whole banks of memory need to be taken out pro commission?– oromeCommented Aug 1, 2019 at 14:18
-
2I have a paper on transient errors of the AGC, which I did not quote because the question was on broken core-rope. It and other sources indicate that parity errors were expected to be either mis-reads of a memory location, or a flipped bit of the erasable memory. Either is temporary and recoverable. Damage to the fixed memory would be permanent, and although the AGC was in the cabin, attempting to repair it would likely cause more damage. The alternative was to use something else that does not use the affected memory.– DrSheldonCommented Aug 1, 2019 at 15:17
-
Patching the code was not an option. The fixed memory was physically permanent. Even if you could write code to the erasable memory, there was no mechanism to execute code at an arbitrary address. There was no power-on-self-test, because you need to be able to reboot the computer and try something else, without the computer getting in the way of that.– DrSheldonCommented Aug 1, 2019 at 15:24
-
Could you ad something to the effect that "Damage to the fixed memory would be permanent, and although the AGC was in the cabin, attempting to repair it would likely cause more damage" to the answer?– oromeCommented Aug 1, 2019 at 15:27
-
Would there have been any particular difficulty with having certain parts of the code check whether a certain word holds a particular "magic value" and--if so--branching to a small otherwise-unused section of RAM? That would create some failure modes, but would seem like it would increase the range of problems that could be fixed "on the fly".– supercatCommented Aug 1, 2019 at 16:22
|
Show 2 more comments
How to Edit
- Correct minor typos or mistakes
- Clarify meaning without changing it
- Add related resources or links
- Always respect the author’s intent
- Don’t use edits to reply to the author
How to Format
-
create code fences with backticks ` or tildes ~
```
like so
``` -
add language identifier to highlight code
```python
def function(foo):
print(foo)
``` - put returns between paragraphs
- for linebreak add 2 spaces at end
- _italic_ or **bold**
- quote by placing > at start of line
- to make links (use https whenever possible)
<https://example.com>
[example](https://example.com)
<a href="https://example.com">example</a>
How to Tag
A tag is a keyword or label that categorizes your question with other, similar questions. Choose one or more (up to 5) tags that will help answerers to find and interpret your question.
- complete the sentence: my question is about...
- use tags that describe things or concepts that are essential, not incidental to your question
- favor using existing popular tags
- read the descriptions that appear below the tag
If your question is primarily about a topic for which you can't find a tag:
- combine multiple words into single-words with hyphens (e.g. ms-dos), up to a maximum of 35 characters
- creating new tags is a privilege; if you can't yet create a tag you need, then post this question without it, then ask the community to create it for you