Main > Monitor/Video Forum
Soft-15KHz - slim new tool for 15KHz on normal vga cards
Joystick Jerk:
Aren't refresh rate and the khz mode the monitor is running in two different things?
shorthair:
Just for informational purposes: I tried out my PIII with an old 64mb Radeon 7000 using .69. I had some bad flicker in Windows, and a little bit in game - both of which I'm sure could've been fixed but I didn't bother - otherwise, though it seemed to operate a little differently than the avga, it seemed to function just fine. Neat app.
Anubis_au:
--- Quote from: Joystick Jerk on May 16, 2007, 08:50:50 pm ---Aren't refresh rate and the khz mode the monitor is running in two different things?
--- End quote ---
Nope, they are mathematically linked.
The vertical line rate times the refresh rate = the output line frequency
eg PAL tv: 625 scan lines x25 frames/sec (50 fields actually) = line frequency of 15.625kHz
NTSC tv: 525 scan lines x30 frames/sec (60 fields) = 15.75kHz line frequency
640x480 at 65Hz = 31kHz
etc
That's why its not enough to simply reduce the output resolution from a video card, because if its still clocked at a 31kHz line freq, the reduced res means a massively increased refresh rate, which might do damage to your monitor, or at best not work. That's why you need to reduce the line freqency to 15KHz via this software, or use an ArcadeVGA etc.
Joystick Jerk:
That's what I meant, that although they're linked their not directly the same thing. Related to 2600's post, you can pull up the OSD on a monitor, but it would just display the refresh rate and not what mode you were necessarily in.
2600:
Refresh Rate, Scan Rate, line frequency, or whatever is your naming flavor. There are two components a horizontal and a vertical. Both are listed in the OSD by the D9200 and almost every SVGA monitor or LCD I've used.
Example picture is in this Retroblast Article, titled "720 running at 25kHz":
http://retroblast.com/reviews/UltimarcArcadeVGA2-1292007-01.html
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