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First post, by vorob

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Take a look: https://youtu.be/fxD89sRMA48

I'm on Compaq Evo n400c with ATI Mobility M1 which is Ati Rage Pro actually.

Tried pure dos and windows 98, no luck

Reply 1 of 10, by root42

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Maybe it's simply bad VGA compatibility in the Ati. Keen uses some sophisticated EGA and VGA features.

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Reply 2 of 10, by ynari

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root42 wrote on 2020-02-27, 09:35:

Maybe it's simply bad VGA compatibility in the Ati. Keen uses some sophisticated EGA and VGA features.

Yep, see https://gona.mactar.hu/DOS_TESTS/.

Try a different card, or use DOSBox, Keen 4-6 under it is indistinguishable from real hardware.

Reply 3 of 10, by root42

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ynari wrote on 2020-02-27, 09:45:
root42 wrote on 2020-02-27, 09:35:

Maybe it's simply bad VGA compatibility in the Ati. Keen uses some sophisticated EGA and VGA features.

Yep, see https://gona.mactar.hu/DOS_TESTS/.

Try a different card, or use DOSBox, Keen 4-6 under it is indistinguishable from real hardware.

Wow. That is one extensive matrix! Nice link!

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Reply 4 of 10, by keenmaster486

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There is a patch to fix ATI compatibility problems in Keen 4, 5, 6:

Re: Keen 4-5-6 choppy scrolling on EGA card

I flermmed the plootash just like you asked.

Reply 5 of 10, by K1n9_Duk3

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Here's a more up-to-date version of my Keen 4-6 fixes. https://pckf.com/viewtopic.php?f=4&t=6192

I think you'll get better results with these updated patches. But the new code does introduce a slight delay after updating the screen, which may be noticeable on rather slow systems (286 and below). Just use whatever seems to work best on your system.

Reply 8 of 10, by ynari

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leileilol wrote on 2020-02-28, 03:11:
ynari wrote on 2020-02-27, 09:45:

use DOSBox, Keen 4-6 under it is indistinguishable from real hardware.

losing that border is pretty distinguishable

Oddly, I don't remember a cyan border, so either I was being blind when doing a comparison (I did a Dosbox vs Real DOS Keen 6 A/B comparison), or it doesn't appear on my system. I'll have a look again tonight..

Reply 9 of 10, by K1n9_Duk3

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That border is the "overscan" area. As far as I can tell, it's only visible on real hardware when connecting the monitor via a VGA cable, not DVI or HDMI or whatever. It's also possible that more modern CRT and/or LCD monitors adjust the position of the display so that the overscan area is not visible. But it's definitely visible on old CRTs.