Hitachi CRT CM1585M-M

Discussion about displays and related hardware including MiSTer filters and video settings.
Rooki3
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Hitachi CRT CM1585M-M

Unread post by Rooki3 »

Well I think I wasted 300 bucks on a new monitor. After reading manual it's a sync on green at 0.3 Vpp. synchronization Horizontal 46-64khz,
Vertical 50-100hz Automatically synchronize. Resolution 1240 by 1024 Manufactured 1996 has bnc inputs RGB only
I can't get mister to display on screen :evil:
Anyone have any suggestions how to make it work? if not, is it any good for something else? Thanks
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mapf
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Re: Hitachi CRT CM1585M-M

Unread post by mapf »

You can try to find a mode that works for your monitor. This is 1240x1024@60

Code: Select all

video_mode=1240,72,136,208,1024,1,3,32,105320
This would require a hsync of 63.60 kHz which would fit your monitor specs.
FoxbatStargazer
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Re: Hitachi CRT CM1585M-M

Unread post by FoxbatStargazer »

Try that mode connected to the Mister I/O's VGA port, with vga_scaler=1 and the SoG switch flipped to on/auto.

If you are using HDMI-> some converter, check that it is outputting SoG.

Bit odd if this can't handle 31khz (i.e. scandoubler=1) but them's not in the manual specs.
Rooki3
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Re: Hitachi CRT CM1585M-M

Unread post by Rooki3 »

FoxbatStargazer wrote: Wed Jul 21, 2021 7:26 pm Try that mode connected to the Mister I/O's VGA port, with vga_scaler=1 and the SoG switch flipped to on/auto.

If you are using HDMI-> some converter, check that it is outputting SoG.

Bit odd if this can't handle 31khz (i.e. scandoubler=1) but them's not in the manual specs.
Tried it and no go, thanks
Rooki3
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Re: Hitachi CRT CM1585M-M

Unread post by Rooki3 »

mapf wrote: Wed Jul 21, 2021 5:46 pm You can try to find a mode that works for your monitor. This is 1240x1024@60

Code: Select all

video_mode=1240,72,136,208,1024,1,3,32,105320
This would require a hsync of 63.60 kHz which would fit your monitor specs.
I'm still new to MiSTer settings. That being said, every time I load up alt 2 and go to ini settings (I think,not sure) it says MiSTer ini settings at top of menu, not alt 2. So how can I change it to apply your mode?
Thanks
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FoxbatStargazer
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Re: Hitachi CRT CM1585M-M

Unread post by FoxbatStargazer »

The ini_settings program only edits mister.ini, no matter which config you are using. If you want to edit the alts, you need to either use different program, or copy/rename mister.ini after use.

By the way when I say "use that mode" I mean the one mapf provided. My recommendations probably won't work without it. You can also try selecting video mode 4 instead of typing that out.
Rooki3
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Re: Hitachi CRT CM1585M-M

Unread post by Rooki3 »

Tried settings from mapf and can see image but now I'm getting this (see pics). When screen changes it goes out of sync. Tried composite sync on and off. Any ideas?
Thanks
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FoxbatStargazer
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Re: Hitachi CRT CM1585M-M

Unread post by FoxbatStargazer »

Composite sync will not help, the manual says Sync on Green and that is what you need. If are using the VGA port on the Analog I/O board be sure that the SoG switch is in the on or auto position (can flip it while running to be sure, it should sync the moment things work.) If you are using HDMI then it's on your adapter to push out SoG somehow.

Of course you could be sending the correct SoG signal and things still aren't lining up right.

As mentioned you can also try the built-in video_mode=4 which might be a more "standard" timing for 1280x1024.
Rooki3
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Re: Hitachi CRT CM1585M-M

Unread post by Rooki3 »

FoxbatStargazer wrote: Mon Jul 26, 2021 3:53 am Composite sync will not help, the manual says Sync on Green and that is what you need. If are using the VGA port on the Analog I/O board be sure that the SoG switch is in the on or auto position (can flip it while running to be sure, it should sync the moment things work.) If you are using HDMI then it's on your adapter to push out SoG somehow.

Of course you could be sending the correct SoG signal and things still aren't lining up right.

As mentioned you can also try the built-in video_mode=4 which might be a more "standard" timing for 1280x1024.
Mode 4 didn't work, the way it's set up at the moment it shows as you can see in picture. It's that every time image changes it goes out of sync. Not sure if it's cause of going over 100mhz . The monitor has a max resolution of 1240x1024.
Thanks for your help
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FoxbatStargazer
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Re: Hitachi CRT CM1585M-M

Unread post by FoxbatStargazer »

Wow sorry, can't read apparently. That's really specific that it can't do 1280....

I guess the next question is when exactly are things in sync or not. Does it just lose sync on a resolution change for a moment, and then come back? Because that is mostly normal, and can be reduced with vsync_adjust=1 or 0, at the price of a bit of lag. If its staying out of sync, then you have to identify what is different about in vs out of sync.

I have had trouble whenever a 1 shows up in a video mode line. If the core sends a refresh rate below what you used to generate the line mode, it might lose sync. You could try this alternate mode line I generate from here: https://v1cdn.destructoid.com/fight%2520copy-620x.jpg

video_mode=1240,80,128,208,1024,3,10,26,105500
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