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.

Serial connector pinout
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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