On 7/15/2015 3:54 PM, Chuck Guzis wrote:
On 07/15/2015 01:30 PM, ben wrote:
Quick look on the web ... ARG! Max segment length 64K something.
Well, even in the late 70s, 64KB was still a goodly chunk of memory in
the microprocessor world. Which reminds me...
To bore you with another STAR tale--the machine had two page sizes--the
"small" page, which was 512K 64-bit words and the "large page", which
was 64K words. What some smart-alec discovered was that in a 512Kw
system, it was possible (easily) to write an instruction that could
never get started. You could have up to 6 addresses in a vector
instruction (3 operands+3 control vectors). Storage was managed in 512
bit "super words". Start your large-page job, put two of the operands
near the end of a page and bingo--you get 8 page references just to get
the instruction started. Of course, the solution was to sell the
customer more memory...
--Chuck
Good idea 512KW is Dim Complex Foo(512,512)
a small matrix I guess for many things.
