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Sega Dreamcast & NAOMI SCI-SPI Mod - Версия для печати

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+--- Тема: Sega Dreamcast & NAOMI SCI-SPI Mod (/thread-4172.html)

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RE: Sega Dreamcast & NAOMI SCI-SPI Mod - segatxdc - 18.06.2025 12:36

Is the compatibility of this SD and HDD the same?

RE: Sega Dreamcast & NAOMI SCI-SPI Mod - megavolt85 - 18.06.2025 13:35

No, but this SD fasrer that SD serial

RE: Sega Dreamcast & NAOMI SCI-SPI Mod - aldair - 24.06.2025 05:19





RE: Sega Dreamcast & NAOMI SCI-SPI Mod - aldair - 25.06.2025 01:05




[Изображение: 7g7a74wh.jpg]

RE: Sega Dreamcast & NAOMI SCI-SPI Mod - SWAT - 25.06.2025 08:54

(25.06.2025 01:05)aldair писал(а):  


SoulCalibur and Dead or Alive 2 is unplayable without pure DMA unfortunately...
The speed is more than enough, there is not enough full-fledged asynchronous data transfer. The CPU is still blocked as in the case of Serial SD, just for x2+ shorter period of time.
An intermediate device (a more advanced adapter) is needed to help fix this problem. But so far, nothing like this has been developed.

RE: Sega Dreamcast & NAOMI SCI-SPI Mod - aldair - 26.06.2025 02:02

(25.06.2025 08:54)SWAT писал(а):  SoulCalibur and Dead or Alive 2 is unplayable without pure DMA unfortunately...
The speed is more than enough, there is not enough full-fledged asynchronous data transfer. The CPU is still blocked as in the case of Serial SD, just for x2+ shorter period of time.
An intermediate device (a more advanced adapter) is needed to help fix this problem. But so far, nothing like this has been developed.

But for DreamNeo and Neo4all it works the same as CD-R without slowness and without deformed sprites.
That's what I wanted most!

RE: Sega Dreamcast & NAOMI SCI-SPI Mod - SWAT - 26.06.2025 09:35

(26.06.2025 02:02)aldair писал(а):  
(25.06.2025 08:54)SWAT писал(а):  SoulCalibur and Dead or Alive 2 is unplayable without pure DMA unfortunately...
The speed is more than enough, there is not enough full-fledged asynchronous data transfer. The CPU is still blocked as in the case of Serial SD, just for x2+ shorter period of time.
An intermediate device (a more advanced adapter) is needed to help fix this problem. But so far, nothing like this has been developed.

But for DreamNeo and Neo4all it works the same as CD-R without slowness and without deformed sprites.
That's what I wanted most!

Apparently the CPU has some free time in DreamNeo and Neo4all, unlike DOA2 and SoulCalibur. Most of the CPU time in 3D games on Dreamcast is taken up by lighting and sending animated geometry to the GPU every frame.
The NEO has 2D graphics without complex geometry and lighting.