| Fireworks Demo [message #373791] |
Thu, 20 September 2018 10:29  |
Vince Weaver
Messages: 136
Registered: April 2013
Karma: 0
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Senior Member |
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Hello,
so I made another cycle-counting demo. This one displays some fireworks
at sunset.
You can see a video/get the disk image here:
http://www.deater.net/weave/vmwprod/fireworks/
This has new vapor-lock code that tries to be cycle-exact, so I can
consistently do mid-screen mode switches. This works fine on my
IIe-platinum and AppleWin but I am still getting some issues on my
actual II+.
First I had to figure out a IIe/II+ issue that turned out to be due to
the II+ adding $1000 to addresses during GR/TEXT HBLANK.
Still, even with that, things *usually* work on the II+, but there's a
glitch at the mid-screen mode switch which you can see in picture on the
website. Don Lancaster in his Vapor Lock article mentions in passing that
the II+ can glitch in this case, and also mentions it switches modes a cycle
earlier than the IIe? But doesn't give any info on why. Any experts out
there who know more about this?
Vince
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| Re: Fireworks Demo [message #373793 is a reply to message #373791] |
Thu, 20 September 2018 11:08  |
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Originally posted by: frank_o_rama
Pretty cool! Like the text scrolling. Never seen that before.
I suppose it's theoretically possible to do another monochrome graphics mode using text only mode at 280 wide x 192 tall (7*40,8*24)? no more purple/green fringing due to the colorburst being off.
f
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| Re: Fireworks Demo [message #373918 is a reply to message #373793] |
Sat, 22 September 2018 18:30 |
Vince Weaver
Messages: 136
Registered: April 2013
Karma: 0
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Senior Member |
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On 2018-09-20, frank_o_rama@hotmail.com <frank_o_rama@hotmail.com> wrote:
>
> I suppose it's theoretically possible to do another monochrome
> graphics mode using text only mode at 280 wide x 192 tall (7*40,8*24)?
> no more purple/green fringing due to the colorburst being off.
I'm not sure what you mean exactly. Something where you draw line 1/8 of the
line of text on one horizotal line, then swap to page 2 for the next 1/8
then maybe manage to change the text by the time you get to the first line?
It'd be interesting to try that, but you'd be limited by the patterns you
can make and I don't think you can replace a full line of text in the 120 or
so cycles you'd have. Hmmm.
I have been looking into using something like this to fake lowercase on
a stock Apple II+ by switching between the text pages, like using the
bottom half of an "8" for a lower-case o and such. You can do some
fun stuff with that.
Vince
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| Re: Fireworks Demo [message #373919 is a reply to message #373793] |
Sat, 22 September 2018 18:33 |
Vince Weaver
Messages: 136
Registered: April 2013
Karma: 0
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Senior Member |
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On 2018-09-20, frank_o_rama@hotmail.com <frank_o_rama@hotmail.com> wrote:
>
> I suppose it's theoretically possible to do another monochrome
> graphics mode using text only mode at 280 wide x 192 tall (7*40,8*24)?
> no more purple/green fringing due to the colorburst being off.
I'm not sure what you mean exactly. Something where you draw line 1/8 of the
line of text on one horizotal line, then swap to page 2 for the next 1/8
then maybe manage to change the text by the time you get to the first line?
It'd be interesting to try that, but you'd be limited by the patterns you
can make and I don't think you can replace a full line of text in the 120 or
so cycles you'd have. Hmmm.
I have been looking into using something like this to fake lowercase on
a stock Apple II+ by switching between the text pages, like using the
bottom half of an "8" for a lower-case o and such. You can do some
fun stuff with that.
Vince
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