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What'd I say? What did I say?

Turns out I was clearing CY when I was clearing OV, S and Z at the start of the handler for ADD/ADC/ADDI/ADCI and SUB/SBC/SUBI/SBCI. As a result, ADC/ADCI/SBC/SBCI were behaving the same as their carry-free equivalents. That's bad.

Images, part 1/2:

Star Fox, fixes planet coloration and late culling of mothership components as it flies on-screen in the intro:




Doom, fixes everything except the massive flickering: