I tested the difference.
Though I am not well informed about the change of the ppu I/O. :P
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OldPPU
$2010 and $2011 are read next to $200F.
Though it seems to change whenever memory is read.
But,It is the same as the value of $200F.
D943:B1 06 LDA ($06),Y @ $200F = #$07
D947:C8 INY
D948:B1 06 LDA ($06),Y @ $2010 = #$07
D94C:C8 INY
D94D:B1 06 LDA ($06),Y @ $2011 = #$07
D94F:C8 INY
Memory of HexEditor
D943:
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
2000 91 1E 07 00 F8 07 62 07 91 1E 07 00 F8 07 62 07
2010 91 1E 07 00 F8 07 62 07 91 1E 07 00 F8 07 62 07
2020 91 1E 07 00 F8 07 62 07 91 1E 07 00 F8 07 62 07
D948,D94D:
other value
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NewPPU
#$10 is read with $D948 and $D94D.
It is different from the value of the memory.
D943:B1 06 LDA ($06),Y @ $200F = #$06
D947:C8 INY
D948:B1 06 LDA ($06),Y @ $2010 = #$10
D94C:C8 INY
D94D:B1 06 LDA ($06),Y @ $2011 = #$10
D94F:C8 INY
Memory of HexEditor
D943:
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
2000 90 1E 10 00 F8 02 6A 06 90 1E 10 00 F8 02 6A 06
2010 90 1E 10 00 F8 02 6A 06 90 1E 10 00 F8 02 6A 06
2020 90 1E 10 00 F8 02 6A 06 90 1E 10 00 F8 02 6A 06
D948:
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
2000 90 1E 10 00 F8 02 4A 04 90 1E 10 00 F8 02 4A 04
2010 90 1E 10 00 F8 02 4A 04 90 1E 10 00 F8 02 4A 04
2020 90 1E 10 00 F8 02 4A 04 90 1E 10 00 F8 02 4A 04
D94D:
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
2000 90 1E 10 00 F8 02 42 04 90 1E 10 00 F8 02 42 04
2010 90 1E 10 00 F8 02 42 04 90 1E 10 00 F8 02 42 04
2020 90 1E 10 00 F8 02 42 04 90 1E 10 00 F8 02 42 04
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Nintendulator
CPUMem of $2000-$7FF0 is always FF
D943:B1 06 LDA ($06),Y @ $200F = #$FF
D947:C8 INY
D948:B1 06 LDA ($06),Y @ $2010 = #$FF
D94C:C8 INY
D94D:B1 06 LDA ($06),Y @ $2011 = #$FF
D94F:C8 INY
Memory of disasemmbly
Always:
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
2000 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
2010 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
2020 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
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