DreamShell 100% Compatibility - Possible?

[fafadou]

I'll meet some informaticians next week for job, I'll try to ask them if they have an idea for an issue... I don't know where you can find some ide bus master ^^

I try to find some informations of ATA bus... I'try to understand how it works.

Which king of ATA bus the dreamcast use ? ATA-1 or ATA-2 ?

I found that :

Standard Trasnfert rate (Mo/s)
ATA-1 PIO 0,1,2: 3.3, 5.2, 8.3
Single-word DMA 0,1,2: 2.1, 4.2, 8.3
Multi-word DMA 0: 4.2

ATA-2 PIO 3,4: 11.1, 16.6
Multi-word DMA 1,2: 13.3, 16,6

Probably the dreamcast have a ATA-1 so maybe you have to use a multi word dma bus for separate sound and game data and avoid the additional memory in sound buffer problem ?...

In a serial port you have only one Rx Tx for bus data but in IDE you have 40 pins, it's not possible to use one pin for sending the cdda directly to the sound chip and separate data and sound ? Perhaps a chip is necessary ?
Do you know how have done the usb-gdrom and gdemu builder for that ? They must have the same problem...

What have you change for running shenmue in the isoloader 0.6.x beta version ? Maybe the issue is there.

Sorry to bother you with my obvious questions.