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Originally Posted By Mitch
For those two you mentioned you'll notice that they are listed as Alpine ROMs and not cart ROMs which is likely why the checksum is different.

Hmm, interesting. And why not to add Alpine ROMs into softlist marked as (Alpine)?

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why not to explain what an Alpine ROM is and where it comes from, instead of presuming everyone knows?
(and no, google is not my friend, since the only links I've found tell me where the data goes, not where the ROM come from)

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An alpine ROM means it doesn't have the encryption header. So it loads at a slightly different address. Standard carts start at address $800000, alpine is at $802000. The alpine board was Atari's development system for the Jaguar.

Mitch

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so those dumps come from real hw, even if a dev board, right?
then it would be interesting to handle them in emulation smile

thanks for the explaination!

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Those files were handled in emulation (.rom file) until recently, when someone broke the loading.

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Originally Posted By Robbbert
Those files were handled in emulation (.rom file) until recently, when someone broke the loading.


did it break with Ville's changes? earlier? later?
an approximate regression version might help to fix it...

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I'm not sure, but I think it came after the checksum checking was implemented.

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the previous code faked the entire startup, bypassing the checksum and forcing the expected string into shared RAM because the CPU cores were so buggy they couldn't even calculate a checksum properly.

I wouldn't say Ville broke the rom loading, he just made it work properly, and reject invalid / bad dumps like the system would.

The original dev units would have used a different bios.

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thanks for the explanations. for the moment we have included the .rom dumps converted to bin/j64, so things can be at least tested, but it would be good to obtain a dump of the dev units

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I actually have the roms for two of the dev units. They're in No-intro as the "Stubulator" roms. Before I forget, Mitch had also confirmed the bios rom for the M-series Jaguar, which was manufactured by JVC, rather than IBM (source).

ETA: Forcing MESS to load these roms in place of the standard Jaguar bios, loads them properly, but don't get further than the initial boot screen.

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