Regression tests with issues

[dirkwhoffmann]

Here is a list of regression tests that need to be worked on:

• Agnus/Copper/Wait/waitblt3
  The test flickers, thus breaking automatic regression testing. TODO: Add CPU sync

• Mainboard/Ports/POT/pot1dat1
  Test flickers. Verify on real machine (screenshot is missing)

[dirkwhoffmann]

Update:

• waitblt3
  CPU sync has been added (vAmiga passes the test)
  

• pot1dat1
  Test also flickers on real machine. I've excluded it from automatic regression testing.