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| 15KHZ on a 31KHZ Monitor |
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| CheffoJeffo:
When I referred to the ArcadeVGA as a CGA card I was talking about its capability to output a 15KHz signal to drive a CGA monitor, as opposed to using it to generate lower resolutions (e.g. those used by CGA monitors) with a 31KHz signal on a VGA monitor. |
| ahofle:
--- Quote from: genesim on May 12, 2009, 10:47:15 am ---Hence a conversion is taking place because it starts with the 15khz signal from MAME? Isn't this actually the exact opposite of a CGA card that output 15khz signal? --- End quote --- MAME doesn't produce any video signals. It 'draws' the screen buffer in memory similar to how the original game would have. This buffer is then 'applied' or copied to the selected resolution. If you are using Direct3D or DirectDraw with hardware stretch, the screen is scaled to the selected resolution. If DirectDraw and no hardware stretch, it is copied directly (plus any necessary borders to fit into the selected resolution are added). That's my understanding anyway. |
| genesim:
Cheffo, I am not talking about that function of the ArcadeVGA. I am talking about the scaling function as Ahofle has said. Ahofle, Yes I guess my confusion is emulated signal vs hardware induced signal. All that matters to me is a proper emulation of the chipset. That is what the ArcadeVGA is doing and I guess that is where we separate. I understand your point. |
| CheffoJeffo:
--- Quote from: genesim on May 12, 2009, 11:43:50 am ---I am not talking about that function of the ArcadeVGA. I am talking about the scaling function as Ahofle has said. --- End quote --- I know, but *I* was when I was talking about the only think that I can think of that put out a 15KHz signal are CGA cards (or cards acting as CGA cards) and std res arcade PCBs, which you questioned. |
| genesim:
My mistake. I didn't understand the hardware. If you anyone knows differently please post. So in closing the 15khz that Andy is quoting being scaled from MAME is like an emulated 15khz signal and not a true one? |
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