I've read in a couple of places - the C128 Wiki being one of them - that during development of the C128 it originally had a single character ROM, but some C64 programs used (?) the character ROM as data and would not work with the revised character set of the C128.
Does anyone have a list of such programs or exactly what they were doing with the character ROM data?
I can't imagine what they would be doing... code obfuscation perhaps??