mednafenPceDev
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Bug: Chris Covell's CPUTest shows with vertical line at wrong position
CPUTest here: https://www.chrismcovell.com/CPUTest/index.html
Shows the vertical line under the left edge of the "D" on real hardware, but 3 BAT blocks (~24 pix) later on Mednafen. Need to check the code to determine whether this means that RCR triggers/raised too late, or whether it's a fixed number of opcodes after VBLANK... meaning that VBLANKS is raised too late.