Here is your answer:
Horizontal frequency 80 Khz, horizontal sync 1uS
Vertical frequency 75Hz vertical sync 37.5uS
Don't worry too much about the sync pulse widths, my standard specifies 1uS horizontal synch, but I used 0.5uS and it worked fine.
Vertical sync for my standard says 124uS or six lines, which is what I programmed into my EPROM.
The Dell only sees sync edges, not pulse widths.
I am using a Dell E176FPb which is a 17 inch LCD monitor.
The only reason I picked the standard that I did, was the frequency division is simple, and I already had a suitable crystal.
You will need to divide down from your crystal to exactly 80 Khz.
Then divide down the 80Khz by exactly 1066 to 75 Hz.
The shematic in post #4 should work as drawn, with a 12.8 Mhz crystal instead of the 10.24 Mhz crystal that I used.
U9 just counts lines.
For my requirement I wanted some horizontal graticule lines (in various colours) for my vertical bar graphs.
The EPROM U8 just turns the RGB on and off on the desired lines, it also generates vertical sync, vertical blanking, and resets the counter U9 after 1066 lines via the cross coupled flip flop U10.
You just program the EPROM to do various things at the desired line count (0 to 1066).
Output of U1 (Q3) will be at line rate, but the other outputs will be at multiples of line rate, which produces various numbers of vertical bars. You could decode that to give timings for any number of horizontal screen divisions.