On Saturday, Mar 1, 2003, at 19:51 Europe/London, the pickle wrote: > Then something is wrong with them *in that machine*. > > Like Mark said, that happens on occasion. The 840AV is probably the > pickiest > Mac ever made when it comes to RAM and VRAM speeds, and a chip that's > only > marginally out of spec might work fine in every other 68K but fail in > the 840AV.
I have also had trouble with VRAM in Power Macs seating badly, as well as in odd LCs. Maybe, as the speckles say in one place while u move the RAM, you have a flakey VRAM socket or dirty contacts in one of the socket beds. > What you're describing is *exactly* the problem that happens when VRAM > is too > slow for a system; a 575 will demonstrate *identical* symptoms with 80 > ns VRAM > (at least, most of the time) when the bus is clocked past about 40 MHz. > Stepping up to 70 ns VRAM solves the problem. Some 80 ns VRAM modules > work > just fine, however, which proves that VRAM spec'd at a single speed > clearly > isn't 100% consistent in its performance. Some 80 ns VRAM is, to put > it > bluntly, faster than other 80 ns VRAM. But the VRAM is 70ns, it says so in the chips. I don't think that is the problem here. It's either it doesn't like 512k VRAM or the VRAM is not seating well. VRAM in Macs is so fickle, I have solved corruption problem in a 7500 by taking the VRAM out, juggling it and putting it back in a different order. It's a crazy science! > It sounds like you just need to find some different VRAM modules and > put those > to use somewhere that isn't so timing-sensitive. Like LCs :). -- Mark Benson AIM - SilValleyPirate Visit FlatPackMacs online: <http://fpm.68kmac.com> Visit my Homepage: <http://homepage.mac.com/markbenson> Vintage Macs List Nanny "Never send a human to do a machine's job." -The Matrix -- Quadlist is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Quadlist info: <http://lowendmac.com/lists/quadlist.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/quadlist%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
