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Atari coding BBS
| Re: 4 pixel rasters |
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Posted by: Creature XL
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Jun,09.2006-09:31
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hi Ultra,
using the information from your link:
http://pasti.fxatari.com/68kdocs/68kPrefetch.html
and the instruction timings found here:
http://oldwww.nvg.ntnu.no/amiga/MC680x0_Sections/mc68000timing.HTML
it looks like the following:
Note all instructions in evl's example code are single-word instructions, therefore the only memory/ bus accesses are the instruction/ data reads and the write-out. The operation of the instructions ( the addition the ADD performs) are hidden in the prefetch. So the only think what counts is the number of bus accesses. Lets write it down:
0 nop - prefetch [ add.w d0,(a0) ]
1 add - read data from (a0)
2 add - prefetch [ move.w d1,(a0) ]
3 add - write-out
4 move - write-out
5 move - prefetch [ add.w d2,(a0) ]
6 add - read
7 add - prefetch [ move.w d3,(a0) ]
8 add - write-out
9 move - write-out
10 move - prefetch...
What interests us now, is WHEN will memory a0 is pointing to be written:
12 - 4 - 16 - 4 - ...
I dont know how the effect is working ( what is a0 pointing to?, why add d0 to and then move d0 into the same location?)
salut,
creature
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Topic
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Posted by
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Date
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4 pixel rasters
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ultra
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Jun,08.2006-00:40
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Re: 4 pixel rasters
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ultra
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Jun,08.2006-00:43
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Re: 4 pixel rasters
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evil
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Jun,08.2006-08:20
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Re: 4 pixel rasters
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ultra
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Jun,08.2006-08:45
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Re: 4 pixel rasters
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earx
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Jun,08.2006-08:55
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Re: 4 pixel rasters
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earx
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Jun,08.2006-08:56
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Re: 4 pixel rasters
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utlra
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Jun,08.2006-09:00
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Re: 4 pixel rasters
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ultra
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Jun,08.2006-10:17
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Re: 4 pixel rasters
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ultra
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Jun,08.2006-11:02
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Re: 4 pixel rasters
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earx
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Jun,08.2006-11:20
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Re: 4 pixel rasters
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ultra
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Jun,08.2006-11:37
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Re: 4 pixel rasters
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earx
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Jun,08.2006-16:35
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Re: 4 pixel rasters
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Creature XL
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Jun,09.2006-09:31
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Re: 4 pixel rasters
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ultra
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Jun,09.2006-10:17
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Re: 4 pixel rasters
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ultra
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Jun,09.2006-10:36
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Re: 4 pixel rasters
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Leonard
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Jun,13.2006-10:27
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Re: 4 pixel rasters
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alien st/cnx
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Jun,15.2006-18:34
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Re: 4 pixel rasters
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Leonard
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Jun,19.2006-11:12
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Re: 4 pixel rasters
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alien st/cnx
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Jun,21.2006-03:08
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Re: 4 pixel rasters
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Leonard
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Jun,21.2006-17:26
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Re: 4 pixel rasters
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evil
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Jun,21.2006-18:30
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Re: 4 pixel rasters
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ggn/KUA
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Jun,22.2006-08:48
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What's the anti-troll code?
That's your personal code to be able to add comments and messages on the dhs.nu site.
Don't have a code or forgot it? Fix it here.
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