[claydillinger]

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Well, it looks like I need to eat a bit of crow here. Because the problem only seemed to manifest when Classic was up, I thought it was a software issue. However, last night I pulled out all of the RAM except the 256 MB DIMM which I moved to the J19 slot. Now the problem seems to be gone. Of course, I am now down to less memory than I had before all of this started. I looks like I am going to have to see if I can get some money for another DIMM. Thanks for your help, Hatter.

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Sorry I got here a bit late, but I was about to suggest that. RAM in G3s is not that complicated - if it checks out in DIMM First Aid and causes no problems, it's fine. The best test is OS X.

[Hatter]

When DFA says the RAM "checks out OK" that only means that it has the SPD programmed - (at the time it was written, Apple provided a firmware update for G4s (but not for B&W) to insure that they had all the supported CAS Latencies, some had none, and the G4 won't work with the RAM.
It 'knew' nothing about whether it was the proper RAM for that system, or whether 10 ns and 7.5 ns RAM would work together.
From

In reply to:

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DIMM First Aid
DIMM First Aid is an application for checking and repairing the settings in the SPD EEPROMs on SDRAM DIMMs.
Send any feedback or bug reports to dfa@mactcp.org.nz
DIMM First Aid 1.2 is now available. Version 1.2 adds support for the QuickSilver G4, and can now check DIMMs on the Beige G3. Reporting the speed of PC133-222 DIMMs has been fixed. DIMMs that are incompatible with newer Macs are no longer reported as incompatible on the Beige G3 and B&W G3.
New in DIMM First Aid 1.1: support for the new iBook, can now check DIMMs on the PowerMac G3 B&W and the PowerMac G4 PCI graphics, and reports the speed rating for DIMMs. Version 1.1 also checks for DIMMs that use chips that are incompatible sizes, such as 64Mx4 chips used on single bank 512MB DIMMs and 32Mx4 chips used on single bank 256MB DIMMs.
Incompatible 256MB and 512MB DIMMs: 256MB DIMMs made from one bank of 16 32Mx4 chips and 512MB DIMMs made from one bank of 16 64Mx4 chips are not compatible with the G4 AGP Graphics, the slot loading iMac, and later models of Mac. They will only work in the Beige G3, the B&W G3, and the G4 PCI Graphics. If you are buying a 256MB or 512MB DIMM and you are not sure if it will work on a Mac, do not buy DIMMs that have a single bank made from 16 chips, make sure it has two banks of 8 chips each, or for 256MB DIMMs one bank of 8 chips or two banks of 4 chips are also OK.
Incompatible DIMMs may also be identified as having 32Mx4 chips (for a 256MB DIMM) or 64Mx4 chips (for a 512MB DIMM). DIMM First Aid will identify these DIMMs as having an incompatible number of column address bits. DIMM First Aid can not fix these DIMMs.

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[GlennBlaylock]

This is just an update on my situation. Yesterday, I put the 128 MB 7.5ns PC133-333 module back into my system's DIMM1/J20 slot. So far so good. I have done everything that was causing the system to crash before without any problems. So, it looks as if I can use this one safely as well. This is good because 256 was a bit confining.

[worf]

I am having some similar problems with B&W G3/450 upgraded with a SOnnet G4/800 ZIF. I susperct that the problems I am having - kernel panics when burning a DVD to external LaCie burner - is due to the 66Mhz bus speed the upgrade forces us to use - could this be part of his problem?

[Hatter]

it is not caused by the bus running @ 66 MHz but from RAM that isn't fast enough to feed the G4.

[GlennBlaylock]

Worf,
Unless the motherboard in your computer has been changed, your computer should have a 100 MHz system bus. It is the beige G3s that have 66 MHz system buses. The B/Ws all have 100 MHz system buses.

[Hatter]

In reply to:

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by adding a Sonnet Encore ZIF G4 (1GHz)

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First sentence. Hence, 66 MHz bus.

[worf]

So, Hatter, should I replce the PC100 RAM I have with PC133?

[Hatter]

If your PC100 is 10 ns, yes, replace it. If you have PC133, put those after any PC100.
J19 would have PC100 8 ns RAM