68kMLA Classic Interface
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| nuBus video card not displaying properly. | |
| Posted by: CelGen on 2009-12-03 03:39:12 I found this 16 million color Apple branded NuBus video card and I really want to use it in my Mac II however it has this issue. On every monitor I connect it to, I got no picture but when I hool it up to my 17" Apple display, I get this:  When I got it there was visual signs it had been in a pretty hostile environment. Some chips had corrosion on the leads, one of the crystals had rust on it. Still, is this something along the lines of say a bad crystal or is the card plain and simply hooped? finding devent NuBus cards around here are surprisingly hard. | |
| Posted by: Unknown_K on 2009-12-03 06:05:12 No idea, I think that is a 640x480 card. | |
| Posted by: Trash80toHP_Mini on 2009-12-03 07:29:49 Judging from the date on the card, my guess would be 640x480 MaxRes too, but I haven't researched it. Might be a bad crystal since you're getting an almost legible display, but you'll need to wait for TomLee to show up or one of the MLA's other boffins.* * IIRC, that was Brit slang for those magicians/sorcerers adept in the black arts of Electronics/RADAR/Electronic "Computing"/Code-Breaking and such at places like Bletchley Park, one of the pre-eminent Xerox PARCs of WWII. | |
| Posted by: JRL on 2009-12-03 20:06:24 I think something's wrong with the onboard VRAM. My IIci's Hi-Res vid card has the exact same issue (scrambled picture) | |
Posted by: CelGen on 2009-12-04 05:02:56I think something's wrong with the onboard VRAM. My IIci's Hi-Res vid card has the exact same issue (scrambled picture)Usually when I have had an issue with vram I was getting pinstriping. | |
Posted by: Unknown_K on 2009-12-04 06:33:50Pinstriping is the most common defect I have seen.I think something's wrong with the onboard VRAM. My IIci's Hi-Res vid card has the exact same issue (scrambled picture)Usually when I have had an issue with vram I was getting pinstriping. Since the card is rusty/dirty try washing it with some soap and water to clean that crud off, let it dry a few days, and try it again. I suspect the RAMDAC chip is shorting or failing. | |
| Posted by: CelGen on 2009-12-10 13:48:45 I have washed it more than once using the same technique I use with motherboards which is put them in the dishwasher with the heater off and no detergents. No success at all unfortunately. | |
| Posted by: Osgeld on 2009-12-10 16:24:05 to me it just looks like the timing is off, bad caps, rotten crystal or just a plain old wrong monitor could be it | |
| Posted by: CelGen on 2009-12-11 03:31:57 I'm thinking it's one of the crystals going bad. I'll see if I can scrounge up a similar one and if I'm still having issues I'm guessing the card is hooped. | |
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