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Forums > C64 Productions > Most d020/d021 raster splits
2023-12-23 09:47
Monte Carlos

Registered: Jun 2004
Posts: 370
Most d020/d021 raster splits

I just recognized that the record list on codebase
contains no entry on the topic.

https://codebase.c64.org/doku.php?id=base:demo_world_records_an..

Any recommends?
I know this was a hot topic until the first fli splits came out.
 
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2023-12-23 22:45
ws

Registered: Apr 2012
Posts: 251
The Fight
this one claims 17 in d021, although it is a repeating pattern, which should be the max. add like another possible 6 in d020 and that should be it, albeit without looking too good or too much flexibility.
2023-12-23 22:56
Krill

Registered: Apr 2002
Posts: 3098
Quoting ws
The Fight
this one claims 17 in d021, although it is a repeating pattern, which should be the max. add like another possible 6 in d020 and that should be it, albeit without looking too good or too much flexibility.
What are you basing your math on?

Within the confines of 63 cycles, i see no more than 15 splits at 4 cycles each.
2023-12-23 23:13
ws

Registered: Apr 2012
Posts: 251
It is not my math. It is what they did. They just used a repeating pattern of STA STX STY. Thats why "without looking too good or too much flexibility". And for the rest i just guessed you could extend that to the border and then have one simple fetch. But true: 6 in the border is probably an illusory assumption.
2023-12-23 23:34
ws

Registered: Apr 2012
Posts: 251
Ah lol, now i took a screenshot and looked closer. It is offset by 2 cycles. Nice. Never trust your eyes. :-D making a fool of myself again.
2023-12-25 10:14
chatGPZ

Registered: Dec 2001
Posts: 11523
Quote:
Within the confines of 63 cycles, i see no more than 15 splits at 4 cycles each.

More with RMW instructions. Does that qualify? :)
2023-12-25 10:32
Krill

Registered: Apr 2002
Posts: 3098
Quoting chatGPZ
Quote:
Within the confines of 63 cycles, i see no more than 15 splits at 4 cycles each.
More with RMW instructions. Does that qualify? :)
Mmmhh, with adjacent splits of the same colour, visible only due to the greydot bug? :)
2023-12-26 10:17
chatGPZ

Registered: Dec 2001
Posts: 11523
A split is a split!
2023-12-26 23:10
Monte Carlos

Registered: Jun 2004
Posts: 370
This looks really raster prone. But contains sprites. Ko Opperation
2024-04-12 07:50
Martin Piper

Registered: Nov 2007
Posts: 739
Quote: This looks really raster prone. But contains sprites. Ko Opperation

I often wondered why that used X/Y for the d016 update instead of using X/Y for faster (more) screen colour stores and then use dec/inc for d016 instead.
2024-05-02 21:26
bOOZElEE

Registered: Dec 2002
Posts: 36
On a C64 with SuperCPU there are 63 splits per line possible, I'm talking about the full screen plasma part:
Popel Premiere
Popel Premiere [1571,1581,FD-2000/4000,CMD-HD]

But as this is not the stock configuration, well, it just does not count ;)
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