21 Jun
2019
21 Jun
'19
2:01 a.m.
On 6/20/2019 6:20 PM, Paul Koning wrote:
Nope, the * PDP 11 * from 1971.
It used if I remember right a 16x1 RAM and a 1 bit ADDER was heart of
the ALU. 4 bit wide TTL came out in the next version of the 11.
Reading the development notes for the PDP 11 (bitsavers) makes
interesting reading on just what was planned back then.
XV6 is teaching unix (2006) I just found out about. We now
all can upgrade from PDP11's with 56K of core to PC with 128KB of memory
:) .
Ben.
Don't you
ALL wish the the 11 was 18 bits. Not looking at REAL
11 but the schematic, two bits would have not been too hard to add.
You mean like a PDP-7 (the first Unix machine)? paul