Sega Dreamcast & NAOMI SCI-SPI Mod

[SWAT]

This guide explains how to access the SH-4 SCI port on Sega Dreamcast and NAOMI systems for both UART/SPI communication modes.
This is can be used for alternative SD card modding or debugging.
In SPI-like mode, SCI can reach transfer speeds of up to 1.5 MB/s, which is x2 faster than mod using the SCIF port for bit-bang SPI.

http://www.dc-swat.ru/blog/hardware/1143.html

[aldair]

(Вчера 10:13)SWAT писал(а):  This guide explains how to access the SH-4 SCI port on Sega Dreamcast and NAOMI systems for both UART/SPI communication modes.
This is can be used for alternative SD card modding or debugging.
In SPI-like mode, SCI can reach transfer speeds of up to 1.5 MB/s, which is x2 faster than mod using the SCIF port for bit-bang SPI.

http://www.dc-swat.ru/blog/hardware/1143.html

Will games that require DMA work on the SCI-SPI Mod?
Will it only support all Serial Port games at double the speed?
Awesome news!

[megavolt85]

(Вчера 23:15)aldair писал(а):  Will games that require DMA work on the SCI-SPI Mod?

no, WINCE and all with MMU don't supported

(Вчера 23:15)aldair писал(а):  Will it only support all Serial Port games at double the speed?

yep, GDI without downsample video/audio/CDDA

[aldair]

(Вчера 23:31)megavolt85 писал(а):  

(Вчера 23:15)aldair писал(а):  Will games that require DMA work on the SCI-SPI Mod?

no, WINCE and all with MMU don't supported

(Вчера 23:15)aldair писал(а):  Will it only support all Serial Port games at double the speed?

yep, GDI without downsample video/audio/CDDA

Very good!