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by cjketle
Thu Dec 26, 2019 7:43 pm
Forum: Beginners
Topic: Can RP read punched paper tape from 1969 somehow?
Replies: 21
Views: 718

Re: Can RP read punched paper tape from 1969 somehow?

Cant really do that now. I'm in the UK anyway. What you do not have is a simple textual document on tape, it will require more context to understand it. What you appear to have is a small piece of Lab software from 1969 that runs on a minimal Series 16 system (4/8Kw?) probably connected to a special...
by cjketle
Tue Dec 24, 2019 5:17 pm
Forum: Beginners
Topic: Can RP read punched paper tape from 1969 somehow?
Replies: 21
Views: 718

Re: Can RP read punched paper tape from 1969 somehow?

OK, a bit more supposition. It looks like you have what was called a 'Self Loading System Tape' that loads a program into address '1000, the usual start address. 60 feet of tape will be about 30 x 12 x 10, about 3.5K words. In other words a 3K ish word program - ie not really enough to do very much....
by cjketle
Tue Dec 24, 2019 4:57 pm
Forum: Beginners
Topic: Can RP read punched paper tape from 1969 somehow?
Replies: 21
Views: 718

Re: Can RP read punched paper tape from 1969 somehow?

That looks very like Honeywell series 16 tapes (see https://en.wikipedia.org/wiki/Honeywell_316). IIRC (and it was a *long* time ago) medic was a debugger program and the tape illustration looks like the '5-5-6' binary format used to punch out on an ASR33 without printing anything. If you are lookin...
by cjketle
Sat Nov 09, 2019 2:38 pm
Forum: Other projects
Topic: Messure AC current
Replies: 5
Views: 782

Re: Messure AC current

Bear in mind that will only tell you the current, not the power as the power factor is likely to be somewhat less than unity. If you are happy with the process of re-flashing the firmware you might be better with a Sonoff POW (https://www.banggood.com/search/1279097.html or other places)) flashed wi...
by cjketle
Sun May 12, 2019 3:46 pm
Forum: Troubleshooting
Topic: Rasberry Pi Don't Starts After Abrupt Shutdown due to short between 3V3 and 5V
Replies: 9
Views: 477

Re: Rasberry Pi Don't Starts After Abrupt Shutdown due to short between 3V3 and 5V

If you have any of those two pin jumpers that are/were often used to configure devices they can usefully be used to reduce the risk of this sort of mishap when probing around. If you always keep one covering the two 5v pins where they would be otherwise exposed then it is more difficult to contact t...
by cjketle
Mon Jan 14, 2019 7:54 pm
Forum: Advanced users
Topic: Raspberry PI cold boot attack protected / Zero out RAM after boot?
Replies: 71
Views: 6217

Re: Raspberry PI cold boot attack protected / Zero out RAM after boot?

For interest, I’ve carried out a few rough and ready experimental measurements on an early Pi1B to get an idea of the scale of the problem. This is done by writing a pattern into a fixed area of memory, powering off and on and reading the memory back to get an idea of how much has changed. These res...

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