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| Anyone know why a Q840av has a RAM ceiling of only 128MiB? |
Posted by: gsteemso on 2013-10-07 22:02:00
I ask purely out of academic curiosity, as my Quadra 840av has either 48 or 64 MiB in it now, don't recall which, which I am in no danger of getting close to the edges of either way. 128 megs is as big as a _single_ 72-pin SIMM can get, so why doesn't this machine support anything over 32MiB times 4? Is it just a ROM limitation, or is it like my Classic II in that the various motherboard components literally can't address anything past an arbitrary limit?
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Posted by: uniserver on 2013-10-08 01:40:49
Quadra 840AV with 512MB (128x4) here is the link to that thread:
viewtopic.php?f=9&t=9282
the 128 meg simms that i bought worked fantastic in the LC475 / Q605 / PM6100
however i was not able to use these 128m simms in the LC3 or LC520 or LC550, i never tried them in the Q840av or LC575.
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Posted by: gsteemso on 2013-10-08 14:11:09
Oho! Marvellous! Thanks for finding that. I now have Yet Another Project awaiting time and funding, and I love it!
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Posted by: trag on 2013-10-18 15:38:21
In my tests, 128MB SIMMs do not work in the Q840AV. However, search for bbraun's posts on the topic in the hacking forum. He's done some interesting RAM capacity increases with ROM modifications. I don't think he's done the 840AV, but my reading is out of date.
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