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Software Support => GroovyMAME => Topic started by: sofakng on March 20, 2015, 10:49:28 pm

Title: ATOM-15: Works, but boot is still distorted?
Post by: sofakng on March 20, 2015, 10:49:28 pm

I have an ATI 4890 connected to a Crescendo TC1600 transcoder connected to a regular CRT TV.

I've used ATOM-15 to create a modified BIOS, and the BIOS flashes fine, but the Windows 7 boot process is still very distorted.  I think I can see a diagonal retrace and the screen flickers extremely bad.

Is it possible that my card is not compatible, or that I need modified 15.7 kHz settings?

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: zebidia on March 21, 2015, 09:12:27 pm

I also have trouble with Atom-15 with my TV. The bios for my 4650 modified and flashed fine, but I get vertical roll on the TV at boot. Once Windows 7 takes over, all is good.

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: cools on March 22, 2015, 09:19:08 am

You might just need to adjust the vertical sync on the TV slightly.

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: Calamity on March 24, 2015, 07:45:21 am

Quote from: sofakng on March 20, 2015, 10:49:28 pm

I have an ATI 4890 connected to a Crescendo TC1600 transcoder connected to a regular CRT TV.

I've used ATOM-15 to create a modified BIOS, and the BIOS flashes fine, but the Windows 7 boot process is still very distorted.  I think I can see a diagonal retrace and the screen flickers extremely bad.

Is it possible that my card is not compatible, or that I need modified 15.7 kHz settings?

The 15 kHz settings applied by ATOM-15 are quite standard. I'm assuming you only checked the 15 kHz box. What output are you using? Have you tried the other one?

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: sofakng on March 24, 2015, 08:12:04 am

Yeah, my card has 2x DVI and 1x S-VIDEO outputs (it's an ATI 4890 PCIe card).  I'm using a DVI-to-VGA adapter (passive) which then connects to the Crescendo TC1600 and finally outputs component video to the TV.

I've tried both DVI outputs with ATOM-15 and both produce the same result. :(

Also, you are correct that I only checked the 15 kHz checkbox (and I double-checked and reflashed the BIOS, etc, just to make sure)

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: Calamity on March 24, 2015, 08:21:13 am

It'd be good to test with another monitor to discard a problem with the video card/atom-15. It could be just that the timings generated by ATOM-15 are not accepted by either the transcoder or the TV. Maybe the transcoder is not able to produce a working composite sync signal out of the separate sync signals. I remind I had to force all bios sync polarities to negative otherwise it wouldn't work on some arcade monitors.

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: sofakng on March 24, 2015, 08:32:09 am

Unfortunately, I literally don't have any other CRTs in the house.

Could I use ArcadeOSD to test the resolution/signal that ATOM-15 is sending?

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: Calamity on March 24, 2015, 08:37:08 am

Quote from: sofakng on March 24, 2015, 08:32:09 am

Could I use ArcadeOSD to test the resolution/signal that ATOM-15 is sending?

No, that's not possible.

Also, I'm assuming the Windows 7 boot screen you're seeing is the old Vista style boot screen that gets activated automatically when the bios is flashed, not the usual Windows 7 boot screen, isn't it?

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: sofakng on March 24, 2015, 08:46:38 am

Do you mean I should be seeing something like this:  http://www.vistax64.com/attachments/tutorials/7236d1223969110-boot-screen-change-default_boot_screen-jpg (http://www.vistax64.com/attachments/tutorials/7236d1223969110-boot-screen-change-default_boot_screen-jpg)
?

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: Calamity on March 24, 2015, 08:49:35 am

This: http://www.petri.com/images/vista_boot_screen_1.gif (http://www.petri.com/images/vista_boot_screen_1.gif)

Title: Re: ATOM-15: Works, but boot is still distorted?
Post by: Calamity on March 24, 2015, 08:51:12 am

Anyway a picture/video might help.