This sounds like speed incompatibility between your old and new RAM.
AFAIK, your Lombard has a 66MHz memory bus, which most (but not all)
PC100 and PC133 SO-DIMM RAM handles OK. When you swap the chips around,
you're simply establishing that some are speed compatible with the
66MHz bus whilst others aren't. This is probably why you get the
address error on startup.
The only solution is to take the faulty RAM back and swap it for other
units. As one of the modules works, it's probably a case of trying a
few until you get the manufacturing tolerances to match.
Cheers ...... Kent
> I am trying to install some new RAM into my PowerBook Lombard, bronze
> keyboard, G3 400. I had 192 megs in it and bought two new 256 meg
> modules
> for a total of 512 meg. Alas they do not work. After trying all kinds
> of
> combinations with the old and the new ram modules I landed at 320
> megs, 1
> new 256 and one old 64 meg. I know from talking with people on the
> list that
> 512 meg works. I am trying to get the system set up for OSX.
>
> If I try to go to 384, one new 256 and one old 128 module, the system
> locks
> at the Welcome to Mac screen with no message.
>
> If I try 512 meg, both new 256 modules, the I get an address error at
> the
> Welcome to Mac screen.
>
> All memory modules work individually just fine.
>
> Turning off extensions does not help.
>
> The new modules are PC100 RAM I have no idea what the existing ones
> are.
>
> Anyone have any ideas.
>
> Thanks,
>
> Larrie Easterly
> Oregon City, Oregon
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