3 Oct
2002
3 Oct
'02
10:23 a.m.
On Wednesday, October 2, 2002, Jerome H. Fine wrote:
When I first saw this line, I did not thing of a drum
system as having
indirect addressing. ... The last 4 decimal digits [of an instruction]
were the ADDRESS of the next instruction on the drum.
That's not indirect addressing. What I mean by 'indirect addressing' is
'accessing data at run-time-computed addresses'. You're talking about
accessing code at hardcoded addresses.
I was thinking of the first machine that supported indirect addressing in
its instruction set, but we should also count machines where you could
kludge indirect addressing by modifying the machine code before executing
it.
--
Jeffrey Sharp