fix multiple driver and missing file in ISE project
add debug plumbing for CIA IRQ bug
remove vestigal comment
plumb ethernet interface lines through. begin work on implementing
ethernet packet RX
add missing plumbing for ethernet controller
begin adding registers to ethernet controller and setup io lines
on startup.
fix ethernet clock plumbing.
add 4KB memory to model.
plumb eth_rxer
implement CPU side of RX buffer access