7 posts • joined 27 Jun 2007
Re: Oh dear, oh dear - you don't remember your history do you
D'oh - should have said 1948, not 1946.
Re: Re: Re: Oh dear, oh dear - you don't remember your history do you
Given the right conditions, painting memory can last 30,000 years, a rather better MTBF than magnetic media.
Re: Re: Oh dear, oh dear - you don't remember your history do you
Well, then, neither was the Mellon optical memory linked to by the author:
"To form a complete memory the system was arranged to be regenerative, with the output of the photocells being amplified and sent back into the CRT to refresh the cells periodically."
The difference is simply that the decay on the Mellon system was longer than the decay on the Williams CRT, so the refresh rate was lower.
My favorite highly impractical early computer memory was http://en.wikipedia.org/wiki/Delay_line_memory#Mercury_delay_lines
Oh dear, oh dear - you don't remember your history do you
The world's second computer - the Manchester Mark 1 (disclosure, I went to Cambridge, and so would argue vociferously that Cambridge beat Manchester in the race) - had the "William's tube" CRT memory in 1946:
And here is another photograph of CRT memory:
There seem to be different "official" images...
A Korean source has a subtly different version of the same image:
The shadow is slanted in this picture, but is obviously a straight line rather than the more complex ones of the soldiers standing next to him. The line on the white step is missing in this picture as well.
Shurely both can't be right?
Mile high club
The SQ 380 has first class suites - with doors - containing a private double bed. If you flash the cash for first, you don't have to attempt vigorous interpersonal integration in a the vertical orientation in a tiny smelly cubicle. I'm saving my air miles for a truly memorable flight of fantasy.
Here's the pictures...
... and boy is it a big switch
- Just TWO climate committee MPs contradict IPCC: The two with SCIENCE degrees
- 14 antivirus apps found to have security problems
- Feature Scotland's BIG question: Will independence cost me my broadband?
- Apple winks at parents: C'mon, get your kid a tweaked Macbook Pro
- FTC to mobile carriers: If you could stop text scammers being jerks that'd be just great