Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns --- Bug Reports --- Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news


Author Topic: dual display 15khz and 31khz posible?  (Read 738 times)

0 Members and 1 Guest are viewing this topic.


  • Trade Count: (0)
  • Jr. Member
  • **
  • Offline Offline
  • Posts: 1
  • Last login:April 08, 2018, 10:33:17 am
  • I want to build my own arcade controls!
dual display 15khz and 31khz posible?
« on: April 08, 2018, 10:32:24 am »

 i want to buy a second display lcd 9" with vga input to my new astro city and i want to display marquee there.

my primary display is already conected to Ms9 15kzh Monitor and i want to connect the second vga cart to a lcd 9" lcd panel (a suppose is 31khz).

Do you think is posible?

Many thanks


  • Trade Count: (+1)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 792
  • Last login:March 20, 2019, 01:18:37 am
  • Is running at 15kHz
Re: dual display 15khz and 31khz posible?
« Reply #1 on: April 08, 2018, 07:33:54 pm »
It's possible, yes. As long as the LCD has it's own EDID (identification data). Ideally it should be done with a 5000 series card or newer, and you enable EDID emulation for the GPU port driving the 15kHz Nanao. You set up your system as needed to serve and protect that monitor, as it were, and once that's done just plug the LCD into the other port. If the LCD is 31kHz or higher and has it's own EDID, it simply tells the video driver what it can handle and the driver will comply.

I'd mess around with things a bit to make sure you can't wrong-foot the setup, make sure you can't accidentally trigger 31- or 45kHz modes on the 15kHz Nanao, etc. It shouldn't happen, but with frontends targeting different displays and switching resolution, it might. Make sure to check the "hide modes this monitor cannot display" box in the monitor properties in windows, and if you're on Win 10, you can stop and disable the AMD External Events Utility service. Those might help.


  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 101
  • Last login:June 21, 2018, 02:25:23 pm
  • 8 bits generation
Re: dual display 15khz and 31khz posible?
« Reply #2 on: April 09, 2018, 02:13:27 am »
We had a similar discussion on this subject,
putting light on a issue that is now fixed :,156351.0.html

With the same Hd5450, I got mame running on the main screen, on my cabinet,
and a second lcd screen showing the relevant marquee.
but I experienced noticeable fps drop not present without the second screen.