Tony> It's normally not too hard to modify the vertical scan rate Tony> of a monitor (at least compared with doing a similar mod to Tony> the horizontal side, which can be _very_ complex). Having a Tony> schematic of the monitor helps a lot, though. Tony> What monitor have you been using on your D'break? I've been using a PAL mono monitor that I used with ZX spectrum like machines. And modifying the scan rate was exactly what I tried to do. I had a schematic of the monitor, all transistor, and with careful twiddling of some resistors and capacitors I was able to change both sync rates (HSYNC is more dangerous since it is coupled with the fly-back converter that generates all those high voltages needed to make electrons move). Cheers, -- *** Rodrigo Martins de Matos Ventura <yoda(a)isr.ist.utl.pt> *** Web page: http://www.isr.ist.utl.pt/~yoda *** Teaching Assistant and PhD Student at ISR: *** Instituto de Sistemas e Robotica, Polo de Lisboa *** Instituto Superior Tecnico, Lisboa, PORTUGAL *** PGP fingerprint = 0119 AD13 9EEE 264A 3F10 31D3 89B3 C6C4 60C6 4585