[nSLUG] Cleaning out my desk...
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Mon Nov 12 22:46:53 AST 2007
Ha ha! That's a crude way to run a program. Not boring at all, very
Jack Warkentin wrote:
> Well, you shouldn't be feeling old. The first program I wrote, using
> punched cards, of course, was in either January or February 1959 for an
> IBM 650 computer. This machine had a rotating magnetic drum memory.
> Every instruction had two addresses, the second of which was a "jump"
> address - instead of having an Instruction Counter, the address of the
> next instruction to be executed was this "jump" address. There was an
> Assembler program whose major job was to calculate the jump addresses
> based on the opcode of the instruction - depending on the opcode, its
> execution time could vary. The idea was to make sure that the drum
> memory had rotated just enough so that the next instruction to be
> executed was just under the drum's read/write head when it was needed.
> I could go on of course but won't bore you any more.
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