SMD133 (AA6023) pinout
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SMD133 (AA6023B): LQFP-48 0.5mm pitch (canonically NES 2.0 Mapper 268 submapper 2/3)
PPU A11 -> / 1 48 \ <- PPU A12
PPU A10 -> / 2 47 \ <- CPU A12
VCC -- / 3 46 \ -> CHR A10
GND -- / 4 45 \ -> CHR A16
CPU A1 -> / 5 44 \ -> CHR A11
(PRG A22, may vary) "PX0" $5001.1 <- / 6 43 \ -> $5000.5 (CHR A19 in submappers 2/3, varies in others)
CHR A13 <- / 7 42 \ -> $5000.4 (CHR A18, varies)
CHR A14 <- / 8 41 \ <- CPU D3
CHR A12 <- / 9 SMD133 40 \ <- CPU D2
(CIRAM A10?) "HV" <- / 10 (AA6023) 39 \ <- CPU D4
CHR A15 <- / 11 38 \ <- CPU D1
CHR A17 <- / 12 37 \ <- CPU D5
PRG A20 <- \ 13 36 / <- CPU D0
/IRQ <- \ 14 35 / -> $5001.2 "PX1" (PRG A21, may vary)
CPU /ROMSEL -> \ 15 34 / <- CPU D6
CPU R/W -> \ 16 33 / <- CPU A0
PRG A15 <- \ 17 32 / <- CPU D7
PRG A13 <- \ 18 31 / -> PRG RAM /CE ("EXT CSB")
CPU A14 -> \ 19 30 / <- M2 ("CK18")
K5K7 or K5K6 -> \ 20 29 / -> VFL
PRG A16 <- \ 21 28 / -- VDD
PRG A14 <- \ 22 27 / -> PRG A19
PRG A18 <- \ 23 26 / -> PRG /CE ("POEB")
CPU A13 -> \ 24 25 / -> PRG A17
"VFL" is reportedly a diode from VDD, originally intended for powering 3V flash. (Don't do that, it's not a good enough voltage regulator).
Source: [1]
