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Re: The Sega Satan WIP/screenshot thread [Re: R. Belmont] #97186 12/01/14 04:05 AM
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rorirub Offline
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Originally Posted By R. Belmont
Doesn't matter. We intend to run the real SH-1 code as soon as we can get our hands on it, because that's what MAME/MESS does. We run the real code from the 8051 inside the PC/XT keyboard and the 8048 on the XT motherboard that it talks to, even though those are two of the most well-documented chips in the history of computing.

Also, how many games fail due to "more or less accurate"? We'd rather have "guaranteed correct".


In that case the SH1 boot rom might not help at all because you'll still be simulating the OCU.

Re: The Sega Satan WIP/screenshot thread [Re: Kale] #97187 12/01/14 04:25 AM
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Based on the experience of no$psx, optical disc simulation is a lot easier to get right once than simulation of the CD microcontroller (it'll work 100% or not at all). And the PSX's CD microcontroller is orders of magnitude simpler than Saturn's, so the compatibility gain from going low-level on Saturn is potentially much greater.

Re: The Sega Satan WIP/screenshot thread [Re: rorirub] #97193 12/01/14 02:18 PM
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Kale Offline OP
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Originally Posted By rorirub
Originally Posted By R. Belmont
Once again I'll ask if anyone's contacted CGFM about the SH-1 BIOS decap method that was posted on assemblergames. I emailed him several months ago and never got a response, but I don't normally talk to him so that's not unexpected. I know Kale/Haze/others speak to him semi-regularly.


It wasn't decapped, it was interfaced with.


Originally Posted By Kale
first one once that somebody let me understand wtf is going on with the decap (hint: 2017?).


The dump was analysed and, from what I remember, it was found that the yabause wiki already has all the CD block tasks more or less accurately documented.


From who, if I may ask?
The Wiki data looks incomplete, and certainly info doesn't seem from a decap.

Re: The Sega Satan WIP/screenshot thread [Re: Kale] #97194 12/01/14 02:35 PM
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The dude hoarding the dump to make the CD drive replacement has made that claim intermittently. But of course it's in his $$$ interests to cripple emulators.

Re: The Sega Satan WIP/screenshot thread [Re: F1ReB4LL] #97195 12/01/14 03:01 PM
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Originally Posted By F1ReB4LL
We preserve the subchannels when possible (proper and verifiable ones, not like trurip)
For the record, is there any guide on how this can be done properly?


LCD artwork scans and cleanups: https://mega.nz/#F!uFYSzK7S!U-lJon9jsqyoCX_3y7_KLA
Re: The Sega Satan WIP/screenshot thread [Re: Kale] #97196 12/01/14 04:05 PM
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If you don't know, you can't do it. (Not being elitist or anything, *I* can't do it either).

Re: The Sega Satan WIP/screenshot thread [Re: Kale] #97199 12/01/14 06:59 PM
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In theory you might dump it via Sega Saturn cd block commands, in practice that would be very time consuming without HW aid.

Re: The Sega Satan WIP/screenshot thread [Re: ICEknight] #97200 12/01/14 08:32 PM
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Originally Posted By R. Belmont
But of course it's in his $$$ interests to cripple emulators.


The truth is far less dramatic, but I'd rather not drag on a topic that has clearly devolved into throwing rude accusations around.

Originally Posted By ICEknight
For the record, is there any guide on how this can be done properly?


Subcodes have no concept of data integrity, so you cannot do "proper and verifiable" dumps of them. Fireball is just blowing hot air - I've used their method, all they do is run multiple passes on the disc, and average the results together.

I'm not saying that it is completely impossible to do proper dump of subcodes, but you will not do it with unmodified commercial hardware.

Originally Posted By Kale
From who, if I may ask?
The Wiki data looks incomplete, and certainly info doesn't seem from a decap.


Jhl did an analysis on the CDB rom and then compared it to the yabause wiki. According to him, only three commands were not documented there.

Re: The Sega Satan WIP/screenshot thread [Re: Kale] #97201 12/01/14 08:43 PM
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The truth is far less dramatic, but I'd rather not drag on a topic that has clearly devolved into throwing rude accusations around.

If the truth is less dramatic, then when can we expect a PM with a copy of the SH-1 binary? :-)

Re: The Sega Satan WIP/screenshot thread [Re: Kale] #97204 12/01/14 09:13 PM
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Great to see some work done on Saturn, Any chance of adding widescreen support in the video option. As its needed in Bomberman. Ive been using a artwork file see below.

<!-- saturn.lay -->

<mamelayout version="2">
<view name="Widescreen (10:9)">
<screen index="0">
<bounds left="0" top="0" right="1920" bottom="1080" />
</screen>
</view>
</mamelayout>

Keep up the great work.
Retro.



Retro
Play the Past.

http://www.freewebs.com/retro27/
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