I expect some here may find this interesting, the original source code for the Apollo guidance computer (AGC) as used in the command module and lunar lander:
And people have built replicas.
where are the assembler mnemonics described ?.
Probably also worth mentioning not all the code was in assembler - they included an interpreter as well, so that they could get more functionality out of the limited available storage, at the cost of reduced execution speed.
They don't make it easy to see the actual code. In the end, I gave up.
So what processors were around in 1969? I think Texas did one as I recall, most of the others mwere more like microcontrollers. Brian
Brian Gaff snipped-for-privacy@blueyonder.co.uk> posted
Wasn't the Intel 4040 the first single-chip CPU, sometime around 1973? Followed by the 8080 in 1975 IIRC?
If you're thinking about microprocessors then the answer is none, for Intel's 4004 did not surface until 1971 / 72
4004 in 1971...
The actual code is red, and not commented out with a hash.
That's what I always thought. I'm sure I read somewhere that the
4004 was derived from the Apollo AGC microprocessor.
Its pretty easy... look at (for example)
Now click on any of the .agc files. For example the ALARM_AND_ABORT.agc and you will get (in theory) the source code listing in AGC assembly language.
(I say in theory, since I was getting errors from the site on some access attempts)
As in what we think of today as a processor - none. The Apollo hardware was a custom built processor *board* (not an IC - they were too new and expensive!).
There is a good description of it here:
That works, thanks.
I couldn't find my my way to those AGC files. The code in my navigation module must be faulty!
The first processor I worked on was about twenty boards with no really big ICs on them. Mostly TTL 74xxx series.
A lot of the stuff was line drivers as there were links to multiple CPUs and multiple memory modules that were shared.
Then there was the IO to the switch and other stuff.
The whole thing was several racks.
It was about the same era or a couple of years later.
1201 or 1202 ??
There's a series of Youtube videos documenting the restoration of an AGC, starting here:
No, 500 server errors
Was that a whoosh??
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