Main > Monitor/Video Forum
Soft-15KHz - slim new tool for 15KHz on normal vga cards
SailorSat:
--- Quote from: Joystick Jerk on May 15, 2007, 09:56:47 pm ---I'm a little confused by resolution selection, and making sure that a game picks the right resolution. What I mean is, several resolutions are duplicated in the different Khz modes, i.e. 640x480 can be selected in either 15khz mode or 31khz mode. When setting resolutions via mame ini's or the Quickres taskbar, all it lists is the resolution though, not the khz mode. So how do I make sure a game is selecting the 15khz-mode resolution and not the 31khz-mode resolution?
--- End quote ---
Ah... now I got it :)
The "lowres" (less than 350 lines) Modes (say 384x240) are not doubled and only available in 15KHz.
The "medres" (between 350 and 440 lines) resolutions are only available in 25KHz.
The "highres" (more than 440 lines), can either be 15KHz or 31KHz, however, If you choose 15+31KHz the same time, the 15KHz modes will be REMOVED and only the 31KHz will be added.
So there is be only 1 Frequency (either 15/25 or 31 KHz) per resolution.
There is a simple rule.
15KHz is basic.
25KHz overwrites 15KHz.
31KHz overwrites 25KHz.
So if you got a 640x480 definition for every Frequency, the 31KHz one will be the one selectable in Windows, and the otheres will be droped and cannot be selected.
--
IF you find ALL your resolutions beings doubled to 31KHz (or more) you most likely got an NVidia card and have more than 32 resolutions defined. This is due to a Bug in the ForceWare and can only be corrected by using less resolutions, most likely by disabling some unusual 15KHz resolutions.
(remove xx,yy in customZZkhz.txt)
resolutions that I would "remove":
remove 240,240
(custom15KHz.txt, games will use 256,240)
remove 448,384
(custom25KHz.txt, games will use 512,384)
Joystick Jerk:
I actually have an ATI. I haven't been having any problems, I was just curious as to how it worked. I didn't forsee problems either, as I understand most arcade games don't even use the higher resolutions. Thanks for the info though, clears it all up!
Speaking of that though, is there any sort of info out there about what range of resolutions most games fall under, and what few particular games have used the higher resolutions, or the oft unused 25khz mode?
SailorSat:
hm...
yeah
export mames data to mame.xml and use some simple code to read it in.
i used something like that for an "tripple 15khz project", however did not finish it right now.
i only have a list of all resolutions used by mame, but not how many games use it.
SailorSat:
I've attached the list, however I don't know how usefull it will be :)
2600:
If you are using 15kHz, 25kHz, and 31kHz then most likely you have some sort of Multi-sync monitor. Don't most of them have an OSD(on screen display). The D9200 does and if you bring up the OSD, it will tell you the refresh rate the monitor is running at.
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