The university of Florida still owned, that's right owned, an IBM 709 when I
was there 1960 through 1968. I took a tour of it and punched a few cards to
program it.
IBM didn't sell computers to anybody not even the feds but they sold this
one. That should have made the purchasing department at U of F suspicious.
I think they ran it until 1970 when it was replaced by a 360.
Regards.
Max. K 4 O DS.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
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http://www.angelfire.com/electronic/funwithtubes/Woodworking/wwindex.html
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----- Original Message -----
From: "Hal Murray" <hmur...@megapathdsl.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Saturday, June 22, 2013 4:10 PM
Subject: Re: [time-nuts] Oscillator temperature compensation
mag...@rubidium.dyndns.org said:
On 06/22/2013 05:27 PM, Didier Juges wrote:
A real treat would be to do the GPS receiver with tubes ;)
The the correlation channel(s) would be possible to do in tubes. The rest
of
the processing is "problematic".
The IBM 709 was tubes. (Well, mostly, they used transistors on the front
end
of the memory.) Memory was 32K 36 bit words. Call it 128K bytes. That
might be enough.
It had a cycle time of 12 microseconds. 12 ns would be 1000x as fast.
That's 80 MHz, a reasonable speed for an ARM. So the CPU in today's GPS
systems is 300x to 1000x faster than the 709.
Anybody know what fraction of an ARM it takes to do the GPS calculations?
Do you have to keep up, or can you do the calculations for every N-th
second?
--
These are my opinions. I hate spam.
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