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Hi Keith,
 
<snip>
It's my understanding that the first system to implement single level
storage was not the S/38 (AS/400, system i5, ...) but the MULTICS operating
system from the 60's.
</snip>
 
Dr Frank did not invent the single-level store - which he freely states, but
he named the S/38 virtual memory storage system after the work done on the
Atlas computer in Manchester, England in 1961.
 
The pioneering paper was published by T. D. Kilburn, B. G. Edwards, M. J.
Lnighan and F. H. Summer. It was titled "One-level Storage System" IRE
Transactions on Electronic Computers. The paper was published in April 1962.
 
The design was used to make computer programs and data occupying many
magnetic drums or disks appear to the programmer as a "single-level store".
Thus, programmers did not need to code for paging-in and paging-out
different parts of a program (overlays) as it processed. The virtual memory
management system would allow the programmer to think that there is always
enough memory, and would perform all the overlay management automatically.
 
Of course, it was Dr Frank's implementation of the single-level store,
together with the 128-bit pointer, page protection, persistent virtual
memory, and pointer security tags which made the AS/400 soooooooo SLIC. ;-)
 
Cheers
 
Larry Ducie
 
 

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