Boatman on the River of Suck wrote:
> I wanted to do it old because I actually own a first-revision PDP-11/70
> which my father bought brand new back in the mid-70's when it first came
> out before I was born. It's a really really neat machine with gobs of I/O
> bandwidth. It's fast too. So it made me think what I might be able to do
> with modern components and still make it compatible with my 11/70. (FYI,
> my 11/70 is still working and is still original, down to its fuses and
> fascia).
Building my 'prehistoric' CPU, I have discovered I am about 5 years
too late to find TTL. 16 x4 RAM and ALU's are very scarce and never
produced in the newer families. You may still find stuff in 74Fxx but
you still are only about 1/2 the power. I am assuming the 11/70 used
74Sxx. You can do a lot with FPGA's today but I don't expect a full
grown PDP-11 will fit in a fpga that is not in a 144 pin TQFP package.
Funny how the logic is now 'super large' FPGA's and single gate 'glue'
chips.
--
Ben Franchuk --- Pre-historic Cpu's --
www.jetnet.ab.ca/users/bfranchuk/index.html
Received on Mon Dec 10 2001 - 01:25:21 GMT