Re: 840 av
I just added 4x256k vram to my 840av and it works fine. Must be 80ns vram to work, alot of the older quadra's can use 100ns ram but not the 840. I think what your seeing is a marginal vram stick and video corruption i the area where data is held on that stick. Try rearanging the sticks in the 4 slots and see if the image corruption changes to another area. 4x512k wont work in the 840. Some machines like the Q950 will take the 512k vram but only use 256k of each stick. do you see a -80 on the chips? - Original Message - From: victoria [EMAIL PROTECTED] To: Quadlist [EMAIL PROTECTED] Sent: Saturday, March 01, 2003 2:46 AM Subject: Re: 840 av On 2/28/03 11:29 PM, the pickle [EMAIL PROTECTED] wrote: At 21:53 + on 28/02/03, victoria wrote: When I set my monitor to millions of colour's no matter what res it is on I get a speckeled part on the screen about a quarter of the screen size. You have bad VRAM, or VRAM that's too slow for that board. Hi Pick thanks for that but like I said I have tested the vram in other macs and it works fine. The sticks I have are 4 x 512k vram chips and also 4 x 256k vram chips all work fine in my other macs. vicki -- Quadlist is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://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 -- Quadlist is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://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
Re: 840 av
On Saturday, Mar 1, 2003, at 10:01 Europe/London, Powermac wrote: I just added 4x256k vram to my 840av and it works fine. Must be 80ns vram to work, alot of the older quadra's can use 100ns ram but not the 840. I think what your seeing is a marginal vram stick and video corruption i the area where data is held on that stick. Try rearanging the sticks in the 4 slots and see if the image corruption changes to another area. I have had this problem with VRAM in PCI PowerMAcs. I had a 7500 and a 7300 and the VRAM worked in the 7500 and not the 7300 (both in OS X 10.1.5). It seems to be a weirdosity that some Apple machines have. It may be that there is a bad VRAM chip in there but it only manifests itself on an 840av due to the speeds and stresses the 840av puts thru the video system. 4x512k wont work in the 840. Some machines like the Q950 will take the 512k vram but only use 256k of each stick. 512k SIMMs are usually recognised as 256k on an 840av. I think there are 1 or two 512ks that don't work properly. do you see a -80 on the chips? or -8 or a number 80 or 8. *Generally Speaking* 512k VRAM SIMMs have 4 large chips on, and 256ks only have 2 on one side. This is not an absolute but it's what I generally find in my large crop of variously upgraded 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 Electronicshttp://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
Re: 840 av
or -8 or a number 80 or 8. *Generally Speaking* 512k VRAM SIMMs have 4 large chips on, and 256ks only have 2 on one side. This is not an absolute but it's what I generally find in my large crop of variously upgraded LCs. Hi I have arranged them in every order I can and the speckels stay the same. As for the chips. The exact writing/number on the chips is OKIJAPAN M548262-70 4432202 ON THE OTHER SIDE IT HAS 1994 MADE IN USA CUBIG INC VM 512K These were working fine up until the other day and they only have 2 x chips on one side. Victoria. -- Quadlist is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://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
Re: 840 av
On 3/1/03 7:51 PM, the pickle [EMAIL PROTECTED] wrote: At 19:18 + on 01/03/03, victoria wrote: I have arranged them in every order I can and the speckels stay the same. 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. 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. It sounds like you just need to find some different VRAM modules and put those to use somewhere that isn't so timing-sensitive. Hi Ok then anyone UK based want a set of 4 matching 512k vram sims for a set of 4 256k vram sims. Also Pick could this explain why my 840 has slowed down to a crawl. I get no errors on the Mac and it is stable as a rock but thing's are taking twice as long as they were just last week. Vicki -- Quadlist is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://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
Re: 840 av
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 Electronicshttp://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
Re: 840 av
At 21:53 + on 28/02/03, victoria wrote: When I set my monitor to millions of colour's no matter what res it is on I get a speckeled part on the screen about a quarter of the screen size. You have bad VRAM, or VRAM that's too slow for that board. -- the pickle FAQ http://macfaq.org/index.shtml _ -- Quadlist is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://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
Re: 840 av
On 2/28/03 11:29 PM, the pickle [EMAIL PROTECTED] wrote: At 21:53 + on 28/02/03, victoria wrote: When I set my monitor to millions of colour's no matter what res it is on I get a speckeled part on the screen about a quarter of the screen size. You have bad VRAM, or VRAM that's too slow for that board. Hi Pick thanks for that but like I said I have tested the vram in other macs and it works fine. The sticks I have are 4 x 512k vram chips and also 4 x 256k vram chips all work fine in my other macs. vicki -- Quadlist is sponsored by http://lowendmac.com/ and... Small Dog Electronicshttp://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
