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#108450 - 01/14/17 08:30 PM Re: PC98 [Re: crazyc]  
Joined: May 2012
Posts: 445
shattered Offline
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Posts: 445
Originally Posted By crazyc
Looks like shattered PPI change at https://github.com/mamedev/mame/pull/1950 broke the 9821 detecting ram over 640K (more correctly it fails to read the dip that shows that there is more ram). It sets the mouse ppi control to 0x93 which is port c upper output and lower input. I don't really know enough about how it's supposed to work in that case to fix it.

Edit: If the above is changed to
Code:
		if (port_c_upper_mode() == MODE_OUTPUT)
		{
			// read data from output latch
			data |= m_output[PORT_C] & mask & 0xf0;
		}

the it works again. Don't know how that effects the Displaywriter though.


Reverting this change doesn't break Displaywriter, so let's do that and figure out what PPI is supposed to do later.

#113103 - 04/11/18 10:19 PM Re: PC98 [Re: EoceneMiacid]  
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crazyc Offline
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[Linked Image]
The last change seems to have fixed many of the issues with 8bit color mode noted in the softlist.

#113106 - 04/12/18 08:18 AM Re: PC98 [Re: EoceneMiacid]  
Joined: May 2010
Posts: 63
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Time to do another round of testing, then... I gues the biggest remaining issue now would be the lack of CDDA sound.

#113157 - 04/18/18 06:24 PM Re: PC98 [Re: EoceneMiacid]  
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Posts: 63
r09 Offline
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Posts: 63
Seeing that a lot has improved lately, I have recorded an uploaded a chunk of the intro for GuynaRock R (no NSFW stuff, of course smile ):

https://youtu.be/EqAXQhoi0q4

Anyone can feel free to post it "out there".

The game is pretty much a full showcase for emulation of later PC-9821 machines: it has 256-color graphics, CDDA for the music, and 86 PCM sound for the voices, and everything seems to be working quite well. It runs a bit slow on the Ce2, but since Pentium-class machines don't work yet, there's not much choice there.

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