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Old 05-20-2014, 06:22 PM   #1
petercli
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Default 1084s monitor is flickering with Classic W.bench

Hi,

I installed Classic Workbench on my NTSC A1200 following these instructions (https://www.youtube.com/watch?v=Zd42...Y&noredirect=1)

I have a 1084s monitor.

I am seeing a lot of flicker . Before, with regular Amiga W.bench 3.1 I don't recalling having so much flicker. Any idea how to fix this ?
Should I move to a LCD monitor ?

Thanks, Peter
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Old 05-20-2014, 06:44 PM   #2
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Default Re: 1084s monitor is flickering with Classic W.bench

Check to see if you are using an Interlace screen mode.
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Old 05-20-2014, 09:15 PM   #3
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Default Re: 1084s monitor is flickering with Classic W.bench

Quote:
Originally Posted by petercli View Post
Hi,

I installed Classic Workbench on my NTSC A1200 following these instructions (https://www.youtube.com/watch?v=Zd42...Y&noredirect=1)

I have a 1084s monitor.

I am seeing a lot of flicker . Before, with regular Amiga W.bench 3.1 I don't recalling having so much flicker. Any idea how to fix this ?
Should I move to a LCD monitor ?

Thanks, Peter
Watched the video and he seems to be working with what he calls, an "Ami-ger.". Second his Ami-ger has an AGA MKII flicker fixer, so it will appear his Ami-ger has no flicker in the interlaced modes with 400 - 512 vertical resolution. If you have flicker on your 1080 monitor, you can not de-flicker either an Amiga nor one of those Ami-gers with a 15.7 kHz monitors. You need a monitor that accepts 31 kHz input. Then with an AGA MKII flicker fixer, you can have a high resolution screen without flicker. Actually there are other devices to achieve this, but in summary an A1080/1084 shows a standard screen with no higher resolution than an old TV (200 TO 256 lines of resolution); when the resolution is doubled, the lines alternate in being displayed and flicker. This would happen on a LED/LCD/plasma flat-screen if the input is 15.7 kHz. So you need a monitor that accepts at least 31 kHz input and a way of getting said output from an A1200 (which normally only outputs 15.7 kHz. It also helps to pronounce "Amiga" the way is is spelled, even if you are dyslexic -- it is like the dyslexic Satan worshiper who sold his soul to Santa.

Last edited by danbeaver; 05-21-2014 at 08:25 AM.. Reason: To edit is human, to typeset is define!
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Old 05-21-2014, 09:13 AM   #4
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Default Re: 1084s monitor is flickering with Classic W.bench

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Originally Posted by Steady View Post
Check to see if you are using an Interlace screen mode.
Agreed. Petercli: change your resolution to a non interlaced mode. As Danbeaver has pointed out, the guy in the video uses an additional bit of hardware (Indivision AGA MkII) to de-interlace the display and convert to a format suitable for modern monitors. As you don't have this, don't select interlaced modes unless you want a headache!
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Old 05-21-2014, 10:58 AM   #5
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Default Re: 1084s monitor is flickering with Classic W.bench

In addition to the already mentioned options (don't use an interlaced screenmode, buy an Indivision), there are some palette color choices designed to reduce flicker. The "Rebel" palette is a good one. Good combination of colors designed to reduce eye strain. More info here:

http://www.mfilos.com/2012/01/guide-...ier-using.html
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Old 05-23-2014, 04:59 AM   #6
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Default Re: 1084s monitor is flickering with Classic W.bench

I switched from 'PAL HI Res Laced' to 'NTSC HI res' , and it looks a lot better.

The Indivision 1200 AGA MK2cr (which replaces the Indivision AGA MkII) looks interesting.

Thanks for the tips.
Peter
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Old 05-23-2014, 06:43 AM   #7
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Default Re: 1084s monitor is flickering with Classic W.bench

Quote:
Originally Posted by petercli View Post
I switched from 'PAL HI Res Laced' to 'NTSC HI res' , and it looks a lot better.

The Indivision 1200 AGA MK2cr (which replaces the Indivision AGA MkII) looks interesting.

Thanks for the tips.
Peter
ntsc flicker less than pal

also you can use euro36 monitor, it works fine on the 1084s yet less flicker than ntsc
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