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70's computer from CEFAS of Lowestoft
70's computer from CEFAS of Lowestoft
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Description: A picture of a very old PC from the early 70's where my Dad used to work (was called 'Ministry of Fisheries' back then). I know so little about this machine or even it's name for that matter! All I know it is took HUGE 16k RAM slices the size of ATX computers.

Enjoy!

P.s. Just edited the title, could be a bit latter then 'early 70's' so just put '70's' to be safe.
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Posted by: tokyoracer at December 05, 2009, 09:40:20 PM

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Comments (6)

ferix
Posts:136
December 14, 2009, 05:27:05 PM
@560SL:

The two tapes weren't a cache. They worked like a swap file or partition on a modern computer. They were used to dump the memory area of the current program when It switched between aplications.
tokyoracer
Posts:1590
December 01, 2009, 05:31:37 PM
Wow thanks guys for that info! :D

I really have no idea about these sorts of machines. All I know is they were the "Difference Engines" of the future, just a digital version of (even though it was 100 years after). It did exacly the same sort of job working out huge sums and others like organising codes etc.
560SL
Posts:197
December 01, 2009, 11:59:51 AM
Sure is an old PDP-11, made by Digital Equipment Corporation. They can still be found here and there doing actual work, some of it presumably critical work so no one dares to touch them. :o). If I remember correctly those four reels are some kind of tape- based cache memory.
ferix
Posts:136
December 01, 2009, 10:53:32 AM
Well, now I'm sure It's a PDP-11.
Take a look to this picture: http://upload.wikimedia.org/wikipedi.../Pdp-11-40.jpg
It has the same modules, mounted on a different arrangement, in a single cabinet.
Just a curiosity, the 68000 design was based on those machines

From wikipedia:

"The 68000 grew out of the MACSS (Motorola Advanced Computer System on Silicon) project [..]"
"The MACSS team drew heavily on the influence of minicomputer processor design, such as the PDP-11 and VAX systems, which were similarly microcoded."

Reference: http://en.wikipedia.org/wiki/68000
tokyoracer
Posts:1590
November 30, 2009, 02:32:43 PM
You may be right, more likely to be a giant calculator although a calculator is little more then a simplified computer if you ask me.

I belive it's job was to work out big sums of bills and basically keeping order of everything (a job that's now done by terribly unreliable Windoze servers).
ferix
Posts:136
November 29, 2009, 01:56:43 PM
Hmmm... I'm pretty sure It wasn't a PC.
It looks to have been a PDP minicomputer, or something like.
Just, take a look at http://en.wikipedia.org/wiki/Programmed_Data_Processor


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