Dave McGuire wrote:
>
> On April 6, Ben Franchuk wrote:
> > The PDP-11 is way too complex for SSI logic.
>
> DEC did it. :)
True -- but remember all but the first PDP-11's were microcoded logic.
Even then that is a lot of control logic. The PDP-11 was a big BOX. The
current CPU I am working has 46 states. Assuming a average of 4 gates
per state (like a 7400) that's 46 chips Just FOR STATE decoding not
counting other control logic assuming random logic is used for
control.Lets not forget the Alu section too, the PDP-11 had the full
range of alu ops not ADD,AND like the PDP-8 and the 11 has 8 registers
too that could be set via the front panel.
---
Ben Franchuk - Dawn * 12/24 bit cpu *
www.jetnet.ab.ca/users/bfranchuk/index.html
Received on Sat Apr 06 2002 - 13:03:37 BST