The best idea, if you really need to install a higher res mode, is to adjust your range line. Or even better, add a second range line to your chosen present in the monitor.ini file. (Or make your own preset, duplicating the current range line and adding second custom one, but you get the point).
In VMM i had chosen "generic_15" and so I tried to modify the monitor.ini file
from
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monitor "generic_15", "Generic 15.7 kHz", "4:3"
crt_range0 15625-15750, 49.50-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 192, 288, 448, 576
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monitor "generic_15", "Generic 15.7 kHz", "4:3"
crt_range0 15625-15750, 49.50-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 192, 288, 448, 800
and I added the modeline 1280 x 800 @ 60.000000 desktop in the user_modes.ini then i have generate the modelines in VMM but without successI would recommend putting some sort of 15kHz protection dongle on the video card output port. like a Jpac, if you already have one. Or there are several DIY designs here - http://forum.arcadecontrols.com/index.php/topic,160869.0.htmlYes, i use the JammASD board (I will add this information to my first post)
crt_range1 51550-51700, 60.00-60.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 0, 0, 800, 800, 800, 800I need to add this second range line in my monitor.ini file?
Thanks for your help