2003 Mapper pinout

                        _____
                       /     \
               Gnd -- / 1  48 \ <- CLK
            GPO 3 <? / 2  O 47 \ <- /SEL
           GPO 2 <? / 3      46 \ <- /WR
          GPO 1 <? / 4        45 \ <- /RD
         GPO 0 <? / 5          44 \ <- M/IO
          Gnd -- / 6            43 \ -> /MBC
     RTC SIO <> / 7              42 \ <- /Reset
    RTC SCK <- / 8                41 \ <- CPU A16
    RTC CS <- / 9                  40 \ <- CPU A17
  ROM A25 <- / 10                   39 \ <- CPU A18
 ROM A24 <- / 11                     38 \ <- CPU A19      Orientation:
ROM A23 <- / 12                       37 \ <- A3          ----------------
          /          BANDAI 2003          \                  36      25
          \        Package TQFP-48        /                   |      |
ROM A22 <- \ 13      0.5mm pitch      36 / <- A2             .--------.
 ROM A17 <- \ 14                     35 / <- A1           37-|BANDAI O|-24
  ROM A16 <- \ 15                   34 / <- A0               |2003    |
       Gnd -- \ 16                 33 / <> D0             48-|O  039XR|-13
    ROM A20 <- \ 17               32 / <> D1                 \--------'
     ROM A21 <- \ 18             31 / <> D2                   |      |
      ROM A19 <- \ 19           30 / -- Vcc                  01      12
       ROM A18 <- \ 20         29 / <> D3
       SRAM /CS <- \ 21       28 / <> D4            Legend:
         ROM /CS <- \ 22     27 / <> D5             -------------------------------------------
        ROM /BYTE <- \ 23 O 26 / <> D6              --[2003]-- Power
         D15 (A-1) <Z \ 24 25 / <> D7               ->[2003]<- 2003 input
                       \     /                      <-[2003]-> 2003 output
                        \   /                       <>[2003]<> Bidirectional
                         \ /                        <Z[2003]Z> Output or high impedance
                          V                         <?[2003]?> Output, unknown if bidirectional

(Note that the corner indicator for pin 1 is subtle
 compared to the other corners as well as other QFPs.)