On Friday 04 August 2006 12:44, Richard Drummond wrote: > Hmmm. I dunno off-hand. I did have a GTF calculator as an Excel spreadsheet > somewhere. I'll see if I can dig it out. In the meantime, you could try > building and using this: > http://sh.nu/nvidia/gtf.c Although this doesn't support double-scan modes, which you'll need unless your monitor can handle 120Hz vertical refresh. ;-) I think this should do the trick: # 320x256 @ 120.00 Hz (GTF) hsync: 33.00 kHz; pclk: 13.20 MHz Modeline "320x256_120.00" 13.20 320 328 360 400 256 257 260 275 -HSync +Vsync DoubleScan This should give you 320x256 @ 60Hz double-scanned. I've not tested it, though. Cheers. Rich