@OffseT: Yes I hope I already tested some of these limit cases but if there are some I missed please tell me about them and I will add a test.
I can tell you if the limit case is already tested and the name of the program to run to see it.
I have tested a lot of things but I have probably missed something.
All the tests I made and published have been run on the following setups: GX4000, 464Plus, 6128Plus, 464 (type 0, tall keys), 464 (type 4), 6128 type 0, 6128 type 1, 6128 type 2, KC Compact.
+ I also tested some hardware devices I have: X-MASS, X-MEM, PlayCity, Symbiface 2, Amram 2, Dobbertin ROM board.
Ace has always been the emulator which people say is the best because of it's higher accuracy and compatibility. I can't run it myself but I have asked Craig to run some tests
The name "acid" tests comes from the html acid test. e.g.
http://acid3.acidtests.org/It means to thoroughly test features. In our case to thoroughly test the hardware of cpc and plus so that the accuracy of emulators can be confirmed and to highlight and show limits and features of our machines so that they can be used (or worked around) in demos and games