Looking at a Wonderswan cartridge with the label side and card edge side up, we count from right to left. The right-most pin is 0 and the left-most pin is 47. To make the project work, the following pins had to be connected:
Pin No. Connected to
0,47GND
9D13(HI SRAM D5)
10D12(HI SRAM D4)
11D11(HI SRAM D3)
12D10(HI SRAM D2)
13D9(HI SRAM D1)
14D8(HI SRAM D0)
19A2(BOTH SRAM)
20A1(BOTH SRAM)
21A0(BOTH SRAM)
25D0(LO SRAM D0)
26D1(LO SRAM D1)
27D2(LO SRAM D2)
28D3(LO SRAM D3)
29D4(LO SRAM D4)
30D5(LO SRAM D5)
31D6(LO SRAM D6)
32D7(LO SRAM D7)
33D14(HI SRAM D6)
34D15(HI SRAM D7)
35A3(BOTH SRAM)
36A4(BOTH SRAM)
37A5(BOTH SRAM)
38A6(BOTH SRAM)
39A11(BOTH SRAM)
40A13(BOTH SRAM)
41A12(BOTH SRAM)
42A7(BOTH SRAM)
43A8(BOTH SRAM)
44A10(BOTH SRAM)
45A9(BOTH SRAM)
46A14(BOTH SRAM)