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Shadow
Account closed
Registered: Apr 2002
Posts: 355 |
How to find a C64 capable of HW-scroll?
I have had my C64-C for more than 20 years, and I love the thing.
However, it always, ALWAYS locks up on hardware scrolling effects (VSP/AGSP or whatever it is called).
That meant that I could never watch for exaple the Horizon demos with large x/y scrolling pictures back in the day.
Then there was the 'pc-style' period from 1994 and the rest of the nineties where demos wasn't using such tricks much more, and all was good.
Lately though I have seen more and more demos use the hardware scrolling tricks again, which means lockups for me and not being able to watch the demo.
The fact that I am pissed of that people use code that is not compatible with all C64s will probably not make much difference, so I guess I am forced to track down another C64, but how do I make sure that it can cope with hardware scrolling?
I think it is a question the average eBay seller is unable to answer, but maybe there is something I should look for? Are old breadbox ones generally better? |
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HCL
Registered: Feb 2003
Posts: 717 |
I'd say the older the better, but still that's no guarantee. |
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JackAsser
Registered: Jun 2002
Posts: 1990 |
Quote: I have had my C64-C for more than 20 years, and I love the thing.
However, it always, ALWAYS locks up on hardware scrolling effects (VSP/AGSP or whatever it is called).
That meant that I could never watch for exaple the Horizon demos with large x/y scrolling pictures back in the day.
Then there was the 'pc-style' period from 1994 and the rest of the nineties where demos wasn't using such tricks much more, and all was good.
Lately though I have seen more and more demos use the hardware scrolling tricks again, which means lockups for me and not being able to watch the demo.
The fact that I am pissed of that people use code that is not compatible with all C64s will probably not make much difference, so I guess I am forced to track down another C64, but how do I make sure that it can cope with hardware scrolling?
I think it is a question the average eBay seller is unable to answer, but maybe there is something I should look for? Are old breadbox ones generally better?
Can I have your C64? Me and my boss Mogwai are currently investigating this so I need a crash-prone C64. |
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ready.
Registered: Feb 2003
Posts: 441 |
sometimes certain C64 behave strangely. I remeber a C64-c being able to run all demos I tried (quite many), without crashing, but crashing on Bomberman game for I don't know what reason. |
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chatGPZ
Registered: Dec 2001
Posts: 11137 |
Quote:
Can I have your C64? Me and my boss Mogwai are currently investigating this so I need a crash-prone C64.
peter wendrich (the guy behind fpga64) is looking for such a c64 too ... :)
and yeah, this is one of the few unsolved mysteries...you cant really say what kind of c64s have this problem and which dont, there seems to be no relation to the board revision, or vic, or whatever. |
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Devia
Registered: Oct 2004
Posts: 401 |
are there any demos that are sure to trigger this bug on the machines prone to it?
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Shadow
Account closed
Registered: Apr 2002
Posts: 355 |
So it is a bit of a gamble, all right, guess I will have to roll the dice and buy one (or two...) C64s and see what happens.
I would really like to help in solving this issue by donating a machine with the problem, however my C64C has too much sentimental value, I will keep that machine with me forever!
But if I buy another machine and it turns out to have the bug as well, I will donate that to suffer some crazy Frankenstein-like experiments at the hands of Mogwai! :)
I will try to find a couple demo that produces the lockups, but as I said I think it is just about any hardware scrolling demo, they usually run for about two to ten seconds before hardlocking. |
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JackAsser
Registered: Jun 2002
Posts: 1990 |
Quote: So it is a bit of a gamble, all right, guess I will have to roll the dice and buy one (or two...) C64s and see what happens.
I would really like to help in solving this issue by donating a machine with the problem, however my C64C has too much sentimental value, I will keep that machine with me forever!
But if I buy another machine and it turns out to have the bug as well, I will donate that to suffer some crazy Frankenstein-like experiments at the hands of Mogwai! :)
I will try to find a couple demo that produces the lockups, but as I said I think it is just about any hardware scrolling demo, they usually run for about two to ten seconds before hardlocking.
Maybe we can use it to measure on, I mean... we're all Lunders so... =) U'll get it back. And we won't destroy it, remeber Mogwai is TEH Data doctor. :D |
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Clarence
Registered: Mar 2004
Posts: 119 |
c128dcr (metal case) is stable against HW scroll. |
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chatGPZ
Registered: Dec 2001
Posts: 11137 |
you cant really say that for sure either :) |
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Danzig
Registered: Jun 2002
Posts: 429 |
a little raster to test against
(based on my experiences in the early 90ies):
- original breadcase c64 can handle vsp
- c64-c / c64-II can not handle vsp
- aldi breadcase can not handle vsp or anything :D
- standard c128 can not handle vsp
- c128 (not metal) can not handle vsp
but: old vic can and new vic can't seems not
to be the solution. a rather old rumour sez
it depends on the cheaper memorychips used. |
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