Marko Mäkelä wrote: > > On Wed, 21 Apr 1999, William Levak wrote: > > > As you change the values from their optimum level, the image begins to > > waver and distort. Getting farther away, you lose sync and the picture > > breaks up. Even further, and the driver circuitry (technically known as a > > ramp generator) ceases to respond to the signals and the screen goes > > blank. NONE of this damages the display in any way. > > What about the urban legends that one could damage a PC display by feeding > wrong line frequencies to it? I've heard of one friend's friend whose > monitor let the smoke out only after a few seconds of wrong signals. Has > anyone really seen a flyback transformer or some other component that has > fried because of out-of-specs frequencies? (Hmm, now when I think of it, > many PAL TVs keep a little noise when fed with an NTSC signal.) I once blew a fuse in my Hercules monitor while I had it attached to the C128. It was not the main fuse, but some other one in the deflection part or so. I can't really remember anymore what I did, but probably I tried some of these high-resolution hacks for the VDC chip and as I know today they all give a shit about proper video timings. Most authors of such programs just try which values show a stable picture on their own monitor and that's it. Many programs don't even sync properly on normal (non-multisync) monitors. Some programs even come with a 'VDC-editor' for messing with the timing, but they lack an explanation of the values. Well, I replaced the fuse (it was soldered in!) and the monitor is still working today. Of course I don't use it much anymore, it's only used a control monitor for the fileserver. Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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