Subject: RE: [stella] problems with monitor syncing From: "Fred Quimby" <c9r@xxxxxxxxxxx> Date: Mon, 2 May 2005 23:23:30 -0400 |
I believe that there are online databases somewhere that have the specs on most monitors. Monitorworld.com maybe? However, the only VGA monitors that will sync this low are very, very old. Some of the first NEC Multisyncs could, for example, which were made in the late 80's or early 90's or thereabout. I know because I used to have one. One alternative is a projector if you have access to one. Most are designed to display NTSC via composite video, so there's a good chance that they would sync to 15 kHz if this was connected to the VGA input. Another alternative is a television that accepts VGA input. These aren't particularly common but they do exist, usually in 27-36" sizes, but there's also a good chance that it will sync to 15.7 kHz just fine through the VGA input. Either way, though, I think it would be cool if this would support native VGA too instead of just composite video/S video or whatnot. You might be able to do it all within the FPGA, as you just need a shift register or two to hold the pixel data from the TIA, and then you could basically copy much of the TIA display/chroma/sync logic, except make this part display the data at twice the clock rate two times each for each scanline. >Hash: SHA1 > >On Mon, 2 May 2005, Fred Quimby wrote: > > 99% of VGA monitors cannot sync to a horizontal frequency lower than >about > > twice that of a television (i.e. most VGA's can't do less than about 30 > > kHz.) Some really old VGA monitors will, but I wouldn't expect that >people > > are going to own these monitors., > > > > A workable solution would be to store the data from each scanline in a > > buffer. Once full, output the buffer at twice the speed, and do it >twice. > > In fact this is exactly what many simple TV to VGA converters do. > >*grumble* > >Any way to find out before buying a monitor, how low in frequency it can >go? >We need to get down to what here, 15.72 KHz? > >- -- >adam@xxxxxxxxxxxxxxxx http://cuddlepuddle.org/~adam >KG6GZR http://cuddlepuddle.org/~adam/resume.html > >-----BEGIN PGP SIGNATURE----- >Version: GnuPG v1.2.1 (GNU/Linux) > >iD8DBQFCdql0yvXf5Z0z5zERAoZaAKCbyFjOWSdLd4+xhx1XxwVN8DUxaACgqCXE >K7x7plANW3MWUs43361a5Fw= >=LwE/ >-----END PGP SIGNATURE----- > >Archives (includes files) at http://www.biglist.com/lists/stella/archives/ >Unsub & more at http://stella.biglist.com > Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://stella.biglist.com
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