320x240 monitor timing

i am trying to find timing information for the the 320x240 video settings for your average monitor. i have done some searches with google and come up with very little. which means either such information doesn't exist, probable but unlikely, or my google-fu is very weak, the more probable reason.

i can find information for 640x480 and above, fairly easily. but anything below that doesn't seem to crop up.

can anybody point me in the direction of documentation, a gogole search string, that will help? i am looking for general information rather than anything board specific.

as i've been searching i have come up with a work around solution. basically i take the 640x480 circuit design that it out there and modify it. i slow down the pixel output, rather than the clock. and allow it to rescan each line. so basically i am halving the pixel output rate, and displaying the hoizontal line twice.

while it appears that it will work. i would rather drive the monitor directly rather than having to use the above work around. though it will have the benefit of doing a quarter display of any resolution.