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Topic: Core skills (Read 524 times) previous topic - next topic

AWOL

"Pete, it's a fool (who) looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.
I speak for myself, not Arduino.

larryd




The young ladies of asia lost their eyesight making these.


No technical PMs.
If you are asked a question, please respond with an answer.
If you are asked for more information, please supply it.
If you need clarification, ask for help.

Qdeathstar

What does the thing in the middle do? Shoot laser beam.
A creaking creeping shadow
stiff against the freezing fog
glares at a tickless watch.

Time has failed him -- all things shall pass.

TomGeorge

#3
May 03, 2019, 04:23 am Last Edit: May 03, 2019, 04:29 am by TomGeorge
Hi,
I have one of those, just finished knitting the core memory, haven't placed the other components yet.

NASA Apollo core memory, fascinating stuff.

https://www.tindie.com/products/kilpelaj/core-memory-shield-for-arduino/

https://en.wikipedia.org/wiki/Magnetic-core_memory

Its what got us to the moon and back.

Start of an interesting quest, to fire up an original LEM guidance computer.
https://www.youtube.com/watch?v=2KSahAoOLdU&t=18s


Tom... :)
Everything runs on smoke, let the smoke out, it stops running....

JMeller

https://en.wikipedia.org/wiki/Magnetic-core_memory:
"For example, the Space Shuttle IBM AP-101B flight computers initially used core memory, which preserved the contents of memory even through the Challenger's disintegration and subsequent plunge into the sea in 1986.[27]"

Just another reason to appreciate this forum - fascinating subjects.

GoForSmoke

I notice that Arduino pins even with drivers don't run that matrix and wonder why?

If selecting a core changes it, how do you read?
1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Your sketch can sense ongoing process events in time.
Your sketch can make events to control it over time.

TomGeorge

#6
Jul 03, 2019, 07:38 am Last Edit: Jul 03, 2019, 07:39 am by TomGeorge
Hi,
Lookup YouTube, some fascinating info.
https://www.youtube.com/watch?v=HPT7Wtp3yoo
Tom.. :)
Everything runs on smoke, let the smoke out, it stops running....

GoForSmoke

I lack bandwidth and have 2G/mo so no youtube please!
1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Your sketch can sense ongoing process events in time.
Your sketch can make events to control it over time.

TomGeorge

Hi,
This is some of the documentation with the shield;
http://www.corememoryshield.com/report.html

Tom.. :)
Everything runs on smoke, let the smoke out, it stops running....

GoForSmoke

Destructive read. Close timing. I like the part about using 1 wire to read 2 cores.
1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Your sketch can sense ongoing process events in time.
Your sketch can make events to control it over time.

TomGeorge

Destructive read. Close timing. I like the part about using 1 wire to read 2 cores.
Yes, its all down to hardware, electronic and programming efficiency to do a specific job.
Tom.. :)
Everything runs on smoke, let the smoke out, it stops running....

GoForSmoke

I wonder if a latch could catch the induced pulse of a changed state? Read with input shift register and BJT?

1) http://gammon.com.au/blink  <-- tasking Arduino 1-2-3
2) http://gammon.com.au/serial <-- techniques howto
3) http://gammon.com.au/interrupts
Your sketch can sense ongoing process events in time.
Your sketch can make events to control it over time.

TomGeorge

#12
Jul 04, 2019, 10:30 am Last Edit: Jul 04, 2019, 10:37 am by TomGeorge
I wonder if a latch could catch the induced pulse of a changed state? Read with input shift register and BJT?
This is from the documentation about reading sense current.


But if you are making ROM type rope core;
http://qrp.gr/coreROM/

Tom.. :)

Everything runs on smoke, let the smoke out, it stops running....

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