| JWallace |
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SCREEN_RAW_PARAMS and dynamic changes
#258220 - 06/24/11 03:58 PM
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So I'm looking into a fairly complicated CRTC chip (The Signetics SCN2674), and it looks like it can configure the sizes of the offscreen areas and visible areas pretty much at will - with at least one game exploiting that for raster timing.
I know it's the case that there's a call that lets visible area be changed within the driver, because PSX.c uses it, but what about the raw parameters - all I see in screen.c is the static versions for init time?
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| R. Belmont |
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Cuckoo for IGAvania
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Re: SCREEN_RAW_PARAMS and dynamic changes
[Re: JWallace]
#258222 - 06/24/11 04:15 PM
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> So I'm looking into a fairly complicated CRTC chip (The Signetics SCN2674), and it
> looks like it can configure the sizes of the offscreen areas and visible areas pretty
> much at will - with at least one game exploiting that for raster timing.
>
> I know it's the case that there's a call that lets visible area be changed within the
> driver, because PSX.c uses it, but what about the raw parameters - all I see in
> screen.c is the static versions for init time?
You can definitely change the screen parameters dynamically; look at the CRTC6845 emulation, for instance.
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| JWallace |
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Re: SCREEN_RAW_PARAMS and dynamic changes
[Re: R. Belmont]
#258313 - 06/25/11 03:25 PM
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OK, thanks - I'm just putting off writing a modern device I guess - although MESS may want this chip eventually, as it appears to be part of a Motorola family of terminal device hardware.
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