Appiah's comprehensive 15KHz monitors list of caveat emptor - Page 4

Lord Aga · 21 August 2017, 10:43

What does that do really?
It fiddles a bit with frequencies and moves the image. Any invisible benefits?

Jope · 21 August 2017, 11:20

It boosts the frequencies to be a bit closer to what SVGA monitors expect. You might be able to use dblntsc on a monitor that didn't quite sync if you add it.

Megamix · 11 September 2017, 15:11

Just be careful when using this list I bought a RGB Adaptor and looking at the list I bought a "NEC 1770NX" to use on my Amiga as it`s on the list a working, comes up out of range

Great monitor just does now work on the Amiga with a Adaptor.

demolition · 11 September 2017, 15:30

Was that a purely passive adapter or one with buffer circuits inside? The passive ones does not work well with all monitors.

appiah4 · 20 September 2017, 15:12

Quote:

Originally Posted by Megamix

Just be careful when using this list I bought a RGB Adaptor and looking at the list I bought a "NEC 1770NX" to use on my Amiga as it`s on the list a working, comes up out of range

Great monitor just does now work on the Amiga with a Adaptor.

Is your adaptor one of the newer passive ones or a Commodore original with components inside?

Cirion · 29 January 2018, 14:16

I have recently found out that a monitor I had also works great for 15hz...

ASUS 24" LED FreeSync VG245Q
Asus 27" LED FreeSync VG275Q (should work as well)

The great thing with VG245Q is that it has both VGA and 2xHDMI and built in speakers. Sound works on both HDMI and minijack. So if you use a DVI->HDMI adapter and minijack sound that works fine too.

Only thing I have found negative, is that to switch from 4:3 to 16:9 streched and back on VGA requiers certain resolutions, so connect something with 800x600 and set 4:3 or 16:9 as you like, and the VGA port will stay that way til you change it. Works great with DblPal on my Amiga, and it can view all resolutions I have thrown at it from the Amiga, including interlaced.

demolition · 29 January 2018, 14:46

Quote:

Originally Posted by Cirion

it can view all resolutions I have thrown at it from the Amiga, including interlaced.

Good to know about this monitor - does it show interlaced modes as flickering or will it perform scan doubling?

appiah4 · 29 January 2018, 15:07

Freesync + 15KHz is a killer combination!

LoneWolf · 02 February 2018, 22:07

Hey everybody. Just to inform that my ACER K202HQL woks 15Khz also

grelbfarlk · 03 February 2018, 03:15

Quote:

Originally Posted by Cirion

I have recently found out that a monitor I had also works great for 15hz...

ASUS 24" LED FreeSync VG245Q
Asus 27" LED FreeSync VG275Q (should work as well)

The great thing with VG245Q is that it has both VGA and 2xHDMI and built in speakers. Sound works on both HDMI and minijack. So if you use a DVI->HDMI adapter and minijack sound that works fine too.

Only thing I have found negative, is that to switch from 4:3 to 16:9 streched and back on VGA requiers certain resolutions, so connect something with 800x600 and set 4:3 or 16:9 as you like, and the VGA port will stay that way til you change it. Works great with DblPal on my Amiga, and it can view all resolutions I have thrown at it from the Amiga, including interlaced.

Cirion can I trouble you for some photos at say 640x200 and 640x512 (or or 640x400). Just curious if there's banding/squashed pixels/stuff.

16 March 2018, 11:10

Some inputs from me:

I got hold of a HP 2335 monitor, a beast from 2004. This is not on Appiah`s list, but I have seen it in another one, as well as mentions in forums.

It did not work perfectly. On VGA, it did sync to 15,25khz with a reported resolution of 560x384. However the picture was very distorted. It changed every time the screen tried to auto-adjust, but it remained distorted and not usable.

Then I tried on composite, as the monitor has that input. This worked very well! Strange thing; on composite the resolution was 664x273.. but picture was nice for composite.

I tried on an Amiga 600, and only in games. No workbench resolutions tested.

amigoun · 16 March 2018, 13:41

Thats normal if it works fine thru composite. But if it worked well on vga you would get better picture quality.

appiah4 · 26 March 2018, 13:45

I will update the table with the recent reports soon. Cheers.

26 March 2018, 18:47

The Samsung 910MP did not seem to work for me with a Commodore RGB -> VGA adapter plugged into my A2000 or A500. Just shows an error that it is "not optimum mode."

Doesn't even work on the Kickstart "insert disk" screen.

It might be on the list because it has a SCART port, where I am guessing it may work better?

(Composite, of course, works OK - but not really what I was hoping for here)

Cloudane · 29 June 2018, 01:56

Updated the wiki with info on good settings for the Dell U2311H - to remove the vertical banding (I found this had some pronounced effects on the Lemmings title animation) you want a pixel clock of 90 and phase of 30, and you can optionally shift the horizontal position left to 20 to compensate. At least those are the settings for my A500, I don't know how variable it is from one unit to another. I'm using the ~£10 adapter from Amigakit.

So glad I splashed out on this monitor now! It was a while ago now but cost a fortune at the time and my only objective was a good quality IPS display for the PC. Never would have imagined it'd work with an Amiga. I also have an A1200 with an Indivision and the latter seems almost redundant now...

japandrej · 15 July 2018, 21:44

The list states that Samsung SyncMaster 713N 17" should work, yet all I'm getting is the "Non Optimum Mode" floating around, when used with the RGB>VGA adapter :/
It shows the message on boot, then goes black for a sec while workbench loads and then the message comes up again. Changing WB resolutions made no difference.

Anyone had better luck? Don't know now if should be trying with the 710N as I've read different opinions on that one too.

zipper · 15 July 2018, 23:09

Doesn't look too good -
Horizontal: 30-81 kHz, Vertical: 56-75 Hz

https://www.manualslib.com/manual/14...page=46#manual

demolition · 15 July 2018, 23:36

Quote:

Originally Posted by zipper

Doesn't look too good -
Horizontal: 30-81 kHz, Vertical: 56-75 Hz

It is irrelevant what the manual states since they never specify being able to sync down to 15.6 kHz/50 Hz even if they can.
Perhaps the 713N comes in different flavors where some will work and some will not. Since it is out of spec, you can never count 100% on it to work.

japandrej · 16 July 2018, 00:03

Quote:

Originally Posted by demolition

It is irrelevant what the manual states since they never specify being able to sync down to 15.6 kHz/50 Hz even if they can.
Perhaps the 713N comes in different flavors where some will work and some will not. Since it is out of spec, you can never count 100% on it to work.

Yeah, I saw the specs too but I hoped that 15khz is just too non-standard to be written down officially. Anyways, my 713N model is manufacture date July 2005, made in Slovakia.

Not sure now if I should gamble more with 710N (I could find those here for not much $), or go straight to benq BL702A...

zipper · 16 July 2018, 12:33

You never know - my older BenQ starts at 44 Hz which is really uncommon. But unfortunately it needs at least 24 kHz to sync. It's specced 30 - 82 kHz Multi- frequency monitor 56 - 76 Hz modes.

11 September 2017, 15:11	#63
Megamix Registered User Join Date: Aug 2009 Location: St.Helens, Merseyside UK Age: 63 Posts: 184	List not right Just be careful when using this list I bought a RGB Adaptor and looking at the list I bought a "NEC 1770NX" to use on my Amiga as it`s on the list a working, comes up out of range Great monitor just does now work on the Amiga with a Adaptor.

02 February 2018, 22:07	#69
LoneWolf Registered User Join Date: Sep 2016 Location: San German,PR Posts: 33	Hey everybody. Just to inform that my ACER K202HQL woks 15Khz also Attached Thumbnails

16 March 2018, 11:10	#71
Reb Posts: n/a	Some inputs from me: I got hold of a HP 2335 monitor, a beast from 2004. This is not on Appiah`s list, but I have seen it in another one, as well as mentions in forums. It did not work perfectly. On VGA, it did sync to 15,25khz with a reported resolution of 560x384. However the picture was very distorted. It changed every time the screen tried to auto-adjust, but it remained distorted and not usable. Then I tried on composite, as the monitor has that input. This worked very well! Strange thing; on composite the resolution was 664x273.. but picture was nice for composite. I tried on an Amiga 600, and only in games. No workbench resolutions tested. Attached Thumbnails

16 July 2018, 12:33	#80
zipper Registered User Join Date: Mar 2004 Location: finland Posts: 1,837	You never know - my older BenQ starts at 44 Hz which is really uncommon. But unfortunately it needs at least 24 kHz to sync. It's specced 30 - 82 kHz Multi- frequency monitor 56 - 76 Hz modes. Last edited by zipper; 16 July 2018 at 12:40.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
List of Amiga compatible LCD TVs/Monitors?	ReadOnlyCat	support.Hardware	32	24 March 2017 01:18
2 X Aver v193W LCD monitors VGA Monitors	kurtisebear	MarketPlace	0	08 November 2013 12:48
Comprehensive list of supported joysticks?	rams	support.Hardware	6	05 November 2013 08:04
Videocard for 15Khz Arcade Monitors!!!	MazinKaesar	Retrogaming General Discussion	5	14 April 2010 22:00
Caveat emptor (buyer beware)	Mikey_C	MarketPlace	6	01 November 2007 20:36

21 August 2017, 10:43	#61
Lord Aga MI clan prevails Join Date: Jul 2010 Location: Belgrade, Serbia Posts: 1,443	What does that do really? It fiddles a bit with frequencies and moves the image. Any invisible benefits?

21 August 2017, 11:20	#62
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,861	It boosts the frequencies to be a bit closer to what SVGA monitors expect. You might be able to use dblntsc on a monitor that didn't quite sync if you add it.

11 September 2017, 15:30	#64
demolition Unregistered User Join Date: Sep 2012 Location: Copenhagen / DK Age: 43 Posts: 4,190	Was that a purely passive adapter or one with buffer circuits inside? The passive ones does not work well with all monitors.

29 January 2018, 14:16	#66
Cirion Registered User Join Date: Nov 2017 Location: Oslo/Norway Posts: 10	I have recently found out that a monitor I had also works great for 15hz... ASUS 24" LED FreeSync VG245Q Asus 27" LED FreeSync VG275Q (should work as well) The great thing with VG245Q is that it has both VGA and 2xHDMI and built in speakers. Sound works on both HDMI and minijack. So if you use a DVI->HDMI adapter and minijack sound that works fine too. Only thing I have found negative, is that to switch from 4:3 to 16:9 streched and back on VGA requiers certain resolutions, so connect something with 800x600 and set 4:3 or 16:9 as you like, and the VGA port will stay that way til you change it. Works great with DblPal on my Amiga, and it can view all resolutions I have thrown at it from the Amiga, including interlaced.

29 January 2018, 15:07	#68
appiah4 Registered User Join Date: May 2015 Location: Somewhere in Time Posts: 490	Freesync + 15KHz is a killer combination!

16 March 2018, 13:41	#72
amigoun Registered User Join Date: May 2010 Location: Czech Rep Posts: 599	Thats normal if it works fine thru composite. But if it worked well on vga you would get better picture quality.

26 March 2018, 13:45	#73
appiah4 Registered User Join Date: May 2015 Location: Somewhere in Time Posts: 490	I will update the table with the recent reports soon. Cheers.

26 March 2018, 18:47	#74
barbeque Posts: n/a	The Samsung 910MP did not seem to work for me with a Commodore RGB -> VGA adapter plugged into my A2000 or A500. Just shows an error that it is "not optimum mode." Doesn't even work on the Kickstart "insert disk" screen. It might be on the list because it has a SCART port, where I am guessing it may work better? (Composite, of course, works OK - but not really what I was hoping for here)

29 June 2018, 01:56	#75
Cloudane Registered User Join Date: Jul 2010 Location: Cumbria Posts: 103	Updated the wiki with info on good settings for the Dell U2311H - to remove the vertical banding (I found this had some pronounced effects on the Lemmings title animation) you want a pixel clock of 90 and phase of 30, and you can optionally shift the horizontal position left to 20 to compensate. At least those are the settings for my A500, I don't know how variable it is from one unit to another. I'm using the ~£10 adapter from Amigakit. So glad I splashed out on this monitor now! It was a while ago now but cost a fortune at the time and my only objective was a good quality IPS display for the PC. Never would have imagined it'd work with an Amiga. I also have an A1200 with an Indivision and the latter seems almost redundant now...

15 July 2018, 21:44	#76
japandrej Registered User Join Date: Jun 2016 Location: Belgrade, Serbia Posts: 12	The list states that Samsung SyncMaster 713N 17" should work, yet all I'm getting is the "Non Optimum Mode" floating around, when used with the RGB>VGA adapter :/ It shows the message on boot, then goes black for a sec while workbench loads and then the message comes up again. Changing WB resolutions made no difference. Anyone had better luck? Don't know now if should be trying with the 710N as I've read different opinions on that one too.

15 July 2018, 23:09	#77
zipper Registered User Join Date: Mar 2004 Location: finland Posts: 1,837	Doesn't look too good - Horizontal: 30-81 kHz, Vertical: 56-75 Hz https://www.manualslib.com/manual/14...page=46#manual

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)