reverse a previous change to vertical position by one pixel so
that character map displays in correct position.
disable CIAs for now to avoid nasty bugs.
add registers to keep recent processor state machine transitions
to help debug ZP PC=PC+3 problem.
disable simulation settings erroneously committed.
fix mapping of recent processor fsm states so that it appears
in actual address space.
work on fixing glitches with character generation in first column
and when x scale < 3.