Serial interface
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The Dreamcast has a serial interface on the back of the console used for several peripherals and for console debugging.
| Pin | Description |
|---|---|
| 1 | +5V |
| 2 | SCK |
| 3 | Ground |
| 4 | RX2 |
| 5 | TX2 |
| 6 | RTS |
| 7 | CTS |
| 8 | Ground |
| 9 | Reset |
| 10 | +3.3V |
A SCIF loopback connection can be created to allow a Dreamcast to conduct and pass the SCIF test on the official Sega DC Checker diagnostics software by connecting pin 4 (RX2) to pin 5 (TXD) and connecting pin 6 (RTS) to pin 7 (CTS).
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