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Atari coding BBS
| Re: HBL on Falcon (follow up) |
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Posted by: evil
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Apr,15.2019-11:46
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There are two additional things that havn't been mentioned that limits rasters on Falcon in general and VGA in particular.
1. VGA have twice as fast horizontal frequency, the raster will be further into the screen when the colour is updated
2. Videl have a bug; when you update palette clut, it will generate noise on the screen (at the raster position when you update the colour). The noise can even be seen through bitmap data.
I think if this is going to work well at all, the raster code needs to be quick, eg set the colour first thing in the interrupt. Like wasting an address register for it.
tb:
move.w (a6)+,$ffff8240.w
rte
Or a little slower without register:
tb:
move.w $1c0.w,$ffff8240.w
addq.w #2,-4(pc)
rte
There should be 286 words available at $1c0. Perhaps someone else have a faster method :-)
--
Anders Eriksson
ae@dhs.nu
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Topic
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Posted by
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Date
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HBL on Falcon (follow up)
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Orion
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Apr,11.2019-18:59
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Re: HBL on Falcon (follow up)
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Orion
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Apr,12.2019-00:30
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Re: HBL on Falcon (follow up)
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mikro
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Apr,12.2019-09:08
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Re: HBL on Falcon (follow up)
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Orion
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Apr,12.2019-11:50
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Re: HBL on Falcon (follow up)
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Daniel
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Apr,15.2019-00:09
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Re: HBL on Falcon (follow up)
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mikro
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Apr,15.2019-11:46
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Re: HBL on Falcon (follow up)
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Orion
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Apr,15.2019-15:12
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Re: HBL on Falcon (follow up)
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evil
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Apr,15.2019-11:46
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Re: HBL on Falcon (follow up)
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Orion
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Apr,15.2019-14:39
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Re: HBL on Falcon (follow up)
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mikro
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Apr,16.2019-07:43
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Re: HBL on Falcon (follow up)
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Orion
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Apr,16.2019-12:20
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Re: HBL on Falcon (follow up)
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Daniel
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Apr,16.2019-23:45
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Re: HBL on Falcon (follow up)
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mikro
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Jun,16.2019-14:26
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Re: HBL on Falcon (follow up)
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mikro
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Aug,30.2019-08:32
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