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Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79666
05/27/12 09:45 PM
05/27/12 09:45 PM
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crazyc Offline
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Fair enough, the 3c503 driver I wrote does ISA MMIO banking. Probably not the best way but it seems to work.

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79667
05/27/12 09:49 PM
05/27/12 09:49 PM
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Alegend45 Offline
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Alegend45  Offline
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Well, at least I came up with something. SVGA fixes for all, and for all, a VGA DAC mask fix! laugh

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79668
05/27/12 10:12 PM
05/27/12 10:12 PM
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Melbourne, Australia
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MikeAbson Offline
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Nice! What did you fix mate?

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79669
05/27/12 10:14 PM
05/27/12 10:14 PM
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Alegend45 Offline
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I added a little bit of hardware acceleration to the S3 emulation, and I fixed the non-usage of the VGA DAC mask register! laugh

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79670
05/28/12 01:57 AM
05/28/12 01:57 AM
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MikeAbson Offline
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I'm a reasonably tech-savy person, but understanding DAC's and register mask registers are way over my head haha, So what does it mean when you say you've fixed a non-usuage vga dac mask register? Are there any visual differences that will be noticed because of this / does this mean certain demos and or games now work whereas before they didn't? If I knew anything about programming I'd happily contribute to the project, but unfortunately I can't, all I can do is test it and be very curious smile

Last edited by MikeAbson; 05/28/12 02:26 AM.
Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79671
05/28/12 03:32 AM
05/28/12 03:32 AM
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Alegend45 Offline
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Well, the FIC 486 3.276GN1 BIOS for at486 has MAJOR graphical corruption, if one does nothing, with no HDDs or bootable media inserted. The VGA DAC mask register fix partially fixes it...



This is the before, and I'll leave the after to you.

Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79672
05/28/12 03:54 AM
05/28/12 03:54 AM
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Posts: 499
Melbourne, Australia
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MikeAbson Offline
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Fair enough, nice job there smile Did the S3 support hardware acceleration features in DOS or just Windows? I know that 3DFX was supported in DOS, and I think a few other cards support hardware acceleration in DOS to power games like Quake? but don't know about the S3 card that MESS uses, which I think is a Trio?

Re: PC/XT/AT (inside) WIP topic [Re: MikeAbson] #79673
05/28/12 04:06 AM
05/28/12 04:06 AM
Joined: Dec 2006
Posts: 524
New Zealand
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mahlemiut Online content
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The S3 card in MESS is a Number Nine 9FX Vision 330 (according to the BIOS), which is basically an S3 764. It's effectively VGA with 8514/A acceleration.


- Barry Rodewald
Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79675
05/28/12 04:55 AM
05/28/12 04:55 AM
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New Zealand
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mahlemiut Online content
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Again, not technically PC, but I thought it was cute that it is possible to install this on the FM Towns...



- Barry Rodewald
Re: PC/XT/AT (inside) WIP topic [Re: Kale] #79676
05/28/12 05:14 AM
05/28/12 05:14 AM
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Posts: 499
Melbourne, Australia
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MikeAbson Offline
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Gotcha. Just looked up the 8514/A and on Wikipedia it talks about accelerating 2D drawing operations. It also goes on to say that it was not first hardware accelerator card for the PC despite it coming out in 1987. From what I read here, the first, or at least one of the very first was the Intel iSBX 275, costing around $3500. It uses a Multibus slot as opposed to ISA if I have that right.

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