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#112412 - 01/31/18 03:51 PM Re: SVN builds - new driver flood [Re: Anna Wu]  
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Stiletto Offline
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Quarterly reminder that I'd love to repost the stuff here on the MAME Facebook page, but I want something to link readers to, and we're biased against forums due to the sheer number of competitors - forum posts don't generally "count". YouTube it, Facebook it, blog about it, whatever.

#112414 - 01/31/18 05:10 PM Re: SVN builds - new driver flood [Re: crazyc]  
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r09 Offline
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Originally Posted by crazyc
Originally Posted by r09
Speaking of that, there is something that's been bugging me for a while: a lot of floppy-based games (mainly Alice Soft ones) don't boot because the floppy drives always fail to read the disk the first time they are accessed (and only the first time).

I've found that if I add "m_fdc->set_force_ready(true)" to machine_start it seems to solve that issue, but I haven't submitted that because I don't really understand the floppy system all that well, and I don't know if it's the "right" solution (as in, more or less accurate to real hardware).

Added a workaround for this. Brandish is weird, it tries to read sector 14 on an 8 sector per side image. I've seen copy protection like that before but the same image works on UNZ, maybe they watch for that and fake it?


It's a Falcom game, so I'm 99,99% sure the original disk is protected (and the same goes for Dinosaur). UNZ must be faking it.

BTW, this reminds me that I *really* should add my MFM images of the PC-98 Renewal version to the softlist before something happens to them, or the original disks...

Last edited by r09; 01/31/18 05:22 PM.
#112465 - 02/02/18 09:23 PM Re: SVN builds - new driver flood [Re: Anna Wu]  
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crazyc Offline
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[Linked Image]
Recreated the protection by hand. It checks for the existence and validity of 5 sectors on track 4 side 1. It doesn't check for the size or contents so just making then 128 bytes each in the gaps is enough. If these had been dumped with IMD or teledisk they probably would have been complete (as long as they are readable with a upd765 as the wd197x is more lenient with the disk structure). If UNZ just returns success from all reads even if they fail, it's enough to pass this.

Last edited by crazyc; 02/02/18 09:27 PM.
#112466 - 02/02/18 09:56 PM Re: SVN builds - new driver flood [Re: Anna Wu]  
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crazyc Offline
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Columns ...

[Linked Image]

Not very original are they.

Edit: Seems I've given them too little credit here, this might be a bit more clever.

Last edited by crazyc; 02/03/18 01:11 AM.
#112470 - 02/03/18 04:55 AM Re: SVN builds - new driver flood [Re: Anna Wu]  
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crazyc Offline
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[Linked Image]
This was caused by a cpu bug where we wern't setting the correct default descriptor flags in real mode and resetting them on return from pmode (only on the 386 and 486 according to bochs which means it would break on a pentium towns?).

#112482 - 02/04/18 02:47 AM Re: SVN builds - new driver flood [Re: Anna Wu]  
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R. Belmont Online content
R. Belmont  Online Content

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USA
This is "Pittanko Zaurus" ("ピッタンコ ザウルス") because Konami made a *lot* of medal games.

It wins a special prize for having the K055555 System GX priority mixer and then apparently not using any of its functions except layer on/off.

[Linked Image]

ETA: here's a better shot after some additional work. The art style on this I think has to be Parodius Team.

[Linked Image]

ETA2 And even better...

[Linked Image]

Last edited by R. Belmont; 02/04/18 03:21 PM. Reason: improved shot, take 2
#112493 - 02/05/18 04:41 AM Re: SVN builds - new driver flood [Re: Anna Wu]  
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crazyc Offline
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[Linked Image]
This abuses some framebuffer layout quirks.

#112576 - 02/11/18 03:15 PM Re: SVN builds - new driver flood [Re: Anna Wu]  
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r09 Offline
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I just want to say thanks for getting Cameltry to work, Carl. I spent a lot of money to preserve that stupid game, so I'm super happy to see that the dump is ok and that the "convert everything non-standard to HxC MFM" approach works.

(also good to find something that uses sprite rotation and isn't made by CRI, btw)

[Linked Image]

#112577 - 02/11/18 04:06 PM Re: SVN builds - new driver flood [Re: Anna Wu]  
Joined: Mar 2001
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R. Belmont Online content
R. Belmont  Online Content

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Protip: -snapsize 640x480 (or something appropriate that's 4:3) to get more legible screenshots of games running in weird resolutions like that.

#112582 - 02/11/18 06:46 PM Re: SVN builds - new driver flood [Re: Anna Wu]  
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r09 Offline
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Good to know, although in this case you can also enable the hi-res mode and it looks pretty good...

[Linked Image]

It seems the DMA controller fix has broken something else, though. TownsOS now hangs on boot, but only if it's running from the HDD, booting from CD is fine. It either starts beeping like crazy or just hangs here.

[Linked Image]

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