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Path: sserve!manuel!munnari.oz.au!spool.mu.edu!wupost!uunet!elroy.jpl.nasa.gov!news.claremont.edu!ucivax!news.service.uci.edu!unogate!mvb.saic.com!ncr-sd!sceard!peregrine!ccicpg!conexch!stanton!donegan From: donegan@stanton.UUCP (Steven P. Donegan) Newsgroups: comp.unix.bsd Subject: Re: 386BSD Questions Summary: Memory Limits Message-ID: <65158@stanton.UUCP> Date: 27 Sep 92 14:33:34 GMT References: <2013.416.uupcb@pcb.batpad.lgb.ca.us> <53950@dime.cs.umass.edu> Organization: Stanton Public Domain Systems, Stanton, Ca. Lines: 38 In article <53950@dime.cs.umass.edu>, shri@unreal.cs.umass.edu (H.Shrikumar) writes: > In article <2013.416.uupcb@pcb.batpad.lgb.ca.us> mike.batchelor@pcb.batpad.lgb.ca.us (Mike Batchelor) writes: > > > > this even an issue for 386BSD? How about the Mylex and AMI > > brands? Generic Taiwanese OPTI/AMI? I read elsewhere in this > > group a reference to a 16Mb limit, but couldn't find any other > > details. 16M is a good amount to start with, but I would surely > > want to go to 32 or 64 later. > > If this 16 MB limit is dues to 24 bits of address on the ISA, then > does it hold for memories (SIMMs) directly on the mother board ? > On the Generic Taiwan OPTi/AMI boards ? > > -- shrikumar ( shri@legato.cs.umass.edu, shri@iucaa.ernet.in ) There may be a 24 bit limit on the ISA (I don't have a hardware manual at the moment) but why on earth would you be loony enough to want to put memory on the ISA or EISA for that matter. There be wait states between thee and the bus... As to a limit of 16 meg of RAM that's rubbish unless you have a poorly designed motherboard (and in these days of 600$ US 486 motherboards you should be able to replace a faulty design). My made in the USA 486/33 clone handles 16 meg (actually 20 as there are 4 1 meg simms there as well as the 4 meg simms) quite nicely. So there is no inherent design flaw which precludes 32 meg usage at least in my board. For going the next leap to 64 meg - well I haven't done it myself and don't know offhand of any boards with enough simm sockets at 4megX9 to accomodate 64 meg so you're on your own :-) By the way - what do you need 64 meg for anyway... Some major simulation? Or far too many users for the CPU horsepower of a 486 :-) -- Steven P. Donegan The opinions expressed here are mine Senior Telecommunications Engineer donegan@stanton.cts.com, stanton!donegan Information Services 714-932-6055 voicemail Western Digital Corporation 714-894-2246 uucp - nuucp no word