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Jaguar SD Cart Speed

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Did anyone test the 5-clock clock timing for ROM access with the SD Card?
I think if someone manages to run Battlesphere Gold, then it certainly means that the SD card accepts 5 cycles because Battlesphere Gold changes the access speed to 5 from the very beginning.

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No, it doesn't. It doesn't change the access speed nor the bus width from the BIOS setting. :)

 

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Hmm... digging a bit deeper, seems like I may have misremembered there. Now I need to figure out what the hell I was looking at. Disregard! ;)

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I quickly looked at the ROM a while ago, and it seems to me that they were changing the ROM speed access.

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Here -> 82F25E: 0079 0018 00F0 0000      OR.W #$18, MEMCON1

 

Bit 3&4 of MEMCOM1, value 3 = 5 cycles


And this is right after the Joystick test subroutine at the beginning.

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Yeah, I was wrong. It turns out what surprised me was that it doesn't change bus width - at the time I just assumed anyone who bothered to set one would set both. I dug into it myself last night too, since posting wrong information on the internet is a dangerous thing! ;)

 

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Battlesphere Gold boots to a red Jag screen.

I have not tried the ROM on an emulator to check it is ok though.

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With the latest firmware Battlesphere Gold is now running.

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