First Nintendo DS cartridge information by DarkFader Pinout ------ pin x name name description --- - --------- ---------- ---------------- 1 > GND 2 CLK CLKB-MC Clock. High when idle. Data must be stable on rising edge. 3 N NC 4 i ROM CS CSB-MC Selects ROM when low. 8 byte command is expected after pulling low. After that, direction is reversed and optional data is transferred. 5 n RESET RESB-MC 6 t EEPROM CS CSB-MC2 Selects EEPROM when low. 1 byte command is expected after pulling low. After that, optional data is transferred. 7 e IRQ IREQ-MC Grounded in cartridge. Used to detect removal. 8 n +3V3 9 d I/O0 10 o I/O1 11 I/O2 12 C I/O3 13 0 I/O4 14 1 I/O5 15 - I/O6 Also is a serial signal coming from the EEPROM. 16 0 I/O7 Also is a serial signal goes to the EEPROM. 17 1 GND ROM --- U1 custom mask ROM partnr: Macronix MX23L12808-15D (128 Mb = 16 MB) package: 44SOP NTR-AMFE-0 .--------------------. GND | 1 44 | RES VCC | 2 43 | GND GND | 3 42 | IRQ GND | 4 41 | GND CLK | 5 40 | GND GND | 6 39 | GND GND | 7 38 | GND GND | 8 37 | GND GND | 9 36 | GND GND | 10 35 | GND GND | 11 34 | GND GND | 12 33 | GND GND | 13 32 | GND GND | 14 31 | GND GND | 15 30 | GND GND | 16 29 | GND CS | 17 28 | GND IO0 | 18 27 | IO7 IO1 | 19 26 | IO6 IO2 | 20 25 | IO5 IO3 | 21 24 | IO4 GND | 22 23 | VCC '--------------------' Savegame storage ---------------- U2 EEPROM partnr: ST 5044P 9440 SPI interface Dimensions ---------- outer dimensions contact pitch DS: 32mm x 34mm 1.5mm GBA: 57mm x 34.5mm 1.5mm (you can use a GB connector and cut both sides and then add a thin tape to make better contact)