On line 8981 the rom does a STA, where A is 02, to $4015. My emu writes 02 to this address (which should be APU status reg?), but according to the log it looks like it should be writing FF somehow? Up until that point everything matches to my emu.
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... C689 A9 02 LDA #$02 A:00 X:FF Y:15 P:27 SP:FB CYC: 80 SL:212 > C68B 8D 15 40 STA $4015 = FF A:02 X:FF Y:15 P:25 SP:FB CYC: 86 SL:212 C68E A9 3F LDA #$3F A:02 X:FF Y:15 P:25 SP:FB CYC: 98 SL:212 ...
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