I didnt use AVRES but I have done INI files for the ROM I use to make sure the games run in the correct 15K resolution. I have confirmed that it is in fact the case but turning on verbose mode on MAME and checking the used resolution. Mame is definitely using the correct 15k resolution
....some good pictures of the display running, if you can. And it's possible, as with my 6200, that your 6800 is doubling the refresh. What does it say in the OSD in-game on that?
I did some more test. I uninstalled soft15k and re-installed with only the 15k mode enabled. The desktop now appear in interlaced 640x480 and the D9800 OSD report a 15.7khz frequency.
Next I started mame with pacman. The monitor still shows a 31Khz resolution with pacman so it seems that my videocard is definitely doubling the lines.
is there something that need to be tweaked to have a 15k resolution or I need to switch to another card?
Pictures are available here:
http://cid-e4ecfba58f51d061.skydrive.live.com/browse.aspx/Public?authkey=IDiSaNorwhM%24 here is the verbose output of mame -v pacman:
Parsing mame.ini
Parsing mame.ini
Video: Monitor 00010001 = "\\.\DISPLAY1" (primary)
DirectDraw: Using DirectDraw 7
DirectDraw: Configuring device NVIDIA GeForce 6800 GT
Target refresh = 60.606061
DirectDraw: Selecting video mode...
640x 480@ 60Hz -> 63.906187
256x 240@ 60Hz -> 62.276497
256x 264@ 60Hz -> 62.281695
288x 240@ 60Hz -> 62.273001
296x 240@ 60Hz -> 62.272416
304x 240@ 60Hz -> 62.271903
321x 240@ 60Hz -> 62.271001
321x 256@ 60Hz -> 62.271844
336x 240@ 60Hz -> 62.270362
352x 256@ 60Hz -> 62.270362
352x 264@ 60Hz -> 62.270687
352x 288@ 60Hz -> 70.016089
368x 240@ 60Hz -> 62.269333
384x 288@ 60Hz -> 68.475332
392x 240@ 60Hz -> 62.268760
401x 256@ 60Hz -> 62.268913
448x 240@ 60Hz -> 62.267814
512x 240@ 60Hz -> 62.267119
512x 288@ 60Hz -> 65.724359
512x 448@ 60Hz -> 64.491323
512x 512@ 60Hz -> 64.213469
632x 264@ 60Hz -> 62.266461
640x 240@ 60Hz -> 62.266302
640x 288@ 60Hz -> 64.662233
720x 480@ 60Hz -> 63.715530
800x 600@ 60Hz -> 63.389011
1024x 768@ 60Hz -> 63.044791
DirectDraw: Mode selected = 352x 288@ 60Hz
DirectDraw: primary surface created: 352x288x32 (R=00FF0000 G=0000FF00 B=000000FF)
DirectDraw: New blit size = 224x288
DirectDraw: blit surface created: 224x288x32 (R=00FF0000 G=0000FF00 B=000000FF)
DirectSound: Primary buffer: 48000 Hz, 16 bits, 2 channels
RawInput: APIs detected
Input: Adding Mouse #1: \??\HID#Vid_045e&Pid_0713&Col02#7&ccc6a60&0&0001#{378de44c-56ef-11d1-bc8c-00a0c91405dd}
Input: Adding Gun #1: \??\HID#Vid_045e&Pid_0713&Col02#7&ccc6a60&0&0001#{378de44c-56ef-11d1-bc8c-00a0c91405dd}
Input: Adding Kbd #1: \??\HID#Vid_06a3&Pid_8020&MI_00#7&21e641d9&0&0000#{884b96c3-56ef-11d1-bc8c-00a0c91405dd}
DirectInput: Using DirectInput 7