Sega Dreamcast & NAOMI SCI-SPI Mod

[segatxdc]

Is the compatibility of this SD and HDD the same?

[megavolt85]

No, but this SD fasrer that SD serial

[aldair]

[aldair]

[SWAT]

(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.

[aldair]

(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!

[SWAT]

(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.

[aldair]

https://i.imgur.com/S4UMKuy.jpg


https://i.imgur.com/8Br0MpM.jpg


https://i.imgur.com/vhFZdgZ.jpg

[aldair]

[dimka112]

Вот и у меня руки дошли до этого мода. Так же поставил биос на LV640.

(07.06.2025 00:16)megavolt85 писал(а):  LV640 не поддерживается, нужна MX29L3211
даже если добавить поддержку LV640, то для записи будут доступны только три банка, потому что лишь только в трёх совпадают размеры секторов

Так и получилось, завелись только 3 банки, 1-я, 3-я, и 4-я, и то только перемычками на самой плате, стоит добавить провода и переключатель, начинаются танцы с бубнами. Буду что-то думать. Такое ощущение, что чип стартует раньше, чем определяет наличие сигналов L или H на А10 или А20. Я так понимаю во 2-ой банке находится

"В устройстве с ESN защищенный сектор кремния
защищён при поставке с завода. Этот сектор не может
быть изменен каким-либо образом. Устройство с
заводской блокировкой имеет случайный ESN из 8 слов
по адресу 3FFF70h-3FFF77h (для MX29LV640BT) или
000000h-000007h (для MX29LV640BB)."

[chuchox]

(13.05.2025 02:17)aldair писал(а):  

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(11.05.2025 23:28)megavolt85 писал(а):  [quote='aldair' pid='45859' dateline='1746984525']
Are the points correct for the Dreamcast VA2?

no



Thank you very much!

Hello, is this the schematic used for VA2 motherboards?

[megavolt85]

(26.09.2025 22:43)chuchox писал(а):  Hello, is this the schematic used for VA2 motherboards?

yep