The SAxxx self test procedure has changed.  In the old days we would
send S_STAT (7) and follow with a S_YTST, etc.  Now you must wait for the
clear to send (55) that is returned from the 6502 before writing to the 6502
port (S_YTST, etc.).

	Check your self test and see if it still works.  This code was added
when the latest DVC code was added.