mart wrote: ------- > The SE/30 didn't like it very much, but a readable image was produced. > (does this sound early television days or what !!?! :) > White was black and vice versa, image smaller than expected, way to much > upward, a bit distorted, and a fat white zig-zag line (like a heart beat, > but 90 deg rotated) trough everything. > > I could clearly see desktop icons. Opened a few, typed a bit, but had to > close them with the k/b. Menubar was too way up to see. I guessed where > 'special' would be, got it right after a few times, and 'shutdown' became > visible. That was 5 minutes ago. > > Now I wonder how I could improve things. Any idea's? > > �mart > <Philip wrote: <most likely you can tweak several of the coils and other controls on the <analog board. you may or may not increase the stress on parts too much, <it's hard to say. you may wind up killing an se/30 analog board, but <it's probably repairable if you do. you may also have to adjust the <video level and offset to avoid the "zig-zag" which is most likely a <retrace line when the beam is reset vertically or horizontally. as for <black on white vs. white on black, simply inverting the video should do. < the se/30 analog board most likely wants ttl level video rather than <the normal level of video, the easiest way of producing it would be with <a comparator in series on the vid line. you might actually have to <change some of the analog board components to tweak it sufficiently, <I'll see if I still have a schematic.
If you want to there is an inverter chip on the analog board that has some unused inverters, so you could run the video through one of those to make it black on white. However when I connected a SE logic board to a Classic analog board I got the same video as you describe, except the size and position was OK. I would try adjusting the analog board first. Then experiment with different sense settings to see what that does. If you can get the position of the video image fixed (or even if you can't) you could disconnect the three video wires on your Classic and feed the LC video in and see what you get. Leaving the Classic intact except the three video wires sidesteps the PWM question. I think that if you do this last thing you will get black as black and white as white, and maybe some of the other problems may be better. Good work and good luck. johnsn -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> The FAQ: <http://macfaq.org/> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
