Separate makefile for test programs.
Factor out the test script command line processing.
Extract run time from test codes.
Fix makefile.
Add runtime checks to assembly.
New test cases
Fix parity of popped return address.
Ressurrect opdecode unittest.
Make AR/AS exact.
Uh, having univlight in version control might help...
Looks like we get cs/cr exact anyway.
Switch inc/dec.  Simplify carry-in logic.
Name some nets in the memory logic.
Put pullups on the sram bit lines.
Test for memory hazards due to address lines switching too quickly.
Slow down the noverlap.
Avoid glitches on MW due to switching parasitics.