Getting back on point with what you are trying to do...
Why not just add a simple SPI interface to a CPLD and use one of those SPI to Ethernet
bridge chips from Microchip? They run at 10Mbps which is surely fast enough for a PDP8 or
just about any vintage machine prior to the mid 90s. A couple 8 bit shift registers,
simple state machine, and parallel bus mapping would only take a couple dozen macro cells
and a hundred lines of Verilog - if that.
For version 0.1, KISS - Keep It Stupid Simple.
-Alan
Sent from my iPad
On Jan 2, 2014, at 12:50 PM, "Peterson, Roe (LAI)" <roe at
liveblockauctions.com> wrote:
Why do
you need an MMU?
Full-fat Linux requires a MMU so it can firewall processes off from each other.
Heck, even V7 unix required a memory management unit, and not just for extended
addressing on pdp11 systems... Without it you can't protect one process from another.