29 Oct
2010
29 Oct
'10
2:16 p.m.
I have not seen anyone comment any of the other things
I listed as
possible firsts on the PDP-11.
Can anyone come up with an earlier machine that used condition codes?
How about general registers with addressing modes, which is totally
orthogonal? How about having the PC as a general register?
The Philips P800 series has the PC as a general register (register 0).
There are 16 registers, some instructions can only use the first 8, others
can use all 16. Addressing modes (simpler than the PDP11, I admit) are
pretty much orthogonal.
I am not sure wheterh the PDP11 or P800 was first,m they both appeared in
1970 I beleive.
What do you mean by condition codes here?
-tony