Ok, SRAM replacement for the #C64 250407 built in two versions and under test!
Good news is it works!
Bad news, the damn glitch on the title screen of ZetaWing 2 persists! Doesn't matter the timing of the SRAM or the family of the ICs I use.
At this point I need to ask, does anyone here has a PAL C64 with a SRAM mod installed AND ZetaWing 2? I guess it'll be heavily dependant on the motherboard model.
I'd like to know how it behaves for you. My glitch is a flickering lines of pixels under a cloud in the title screen of the game.
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