Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!rpi!uupsi!rodan.acs.syr.edu!dinapoli From: dinapoli@rodan.acs.syr.edu (Ron DiNapoli) Newsgroups: comp.sys.mac.hardware Subject: Re: The LC vs. IIsi Message-ID: <1991Jun6.152838.28374@rodan.acs.syr.edu> Date: 6 Jun 91 15:28:38 GMT References: <1991Jun5.175401.14345@sequent.com> <1991Jun6.010608.5253@minyos.xx.rmit.oz.au> <1991Jun6.011802.6074@minyos.xx.rmit.oz.au> Organization: Syracuse University, Syracuse, NY Lines: 48 In article <1991Jun6.011802.6074@minyos.xx.rmit.oz.au> s902113@minyos.xx.rmit.oz.au (Luke Mewburn) writes: >s902255@minyos.xx.rmit.oz.au (A. Vanderstock) writes: >>>As memory continues its drop in price, I believe future Mac software >>>will require much more of it. The literature says the LC is limited to >>>10 Mbytes and the IIsi to 17 Mbytes. What are these limits based on? >>>Will they be different when 16 Mbyte SIMMs are available? How many SIMM >>>slots does each of these machine have and what are the speed >>>requirements? The Macintosh IIsi Developer Note put out by Apple says that the IIsi will work with 16MB SIMMS. That would make the maximum memory configuration 65MB, when such chips are available. THe LC Developer Note does not make reference to the 16MB SIMMs, so I do not know if they are supported or not on the LC. Can someone confirm this? The IIsi has four SIMMs slots, and 1 MB of RAM soldered onto the motherboard. The LC has two SIMMs slots, and 2 MB soldered onto the motherboard. >*NONONO* >The IIsi has a slot for a card - the 68882 slot. When you buy a 68882 card >from Apple, you can buy 2 versions. 1 gives you a PDS slot, the other NuBus >slot, so you decide "Do I want NuBus or do I want PDS?". Either way, you >have to buy the 68882 card to do this. I think some other companies supply >stuff like EtherNet cards for this slot, with 68882 already on them. >If you want a bit of speed, get the 68882 card. I think the nubus version >would be the way to go. You'll notice the diff. > I don't think there is any such thing as a "68882 slot". THe IIsi comes with a 68030 PDS slot right on the motherboard. Theoretically, any PDS card could be plugged directly into the motherboard. The problem is that you would not be able to put the cover back on the machine (I have seen some new cards advertised that are *very* short and can be plugged directly into the PDS slot on the motherboard which do not obstruct the cover of the machine). This is where the PDS or NuBus "Adapter" comes in. Both of these adapters come with a 68882 co-processor socket on the adapter, and in most cases that socket will be filled with a 68882 chip (It is possible to purchase a PDS adapter at a very low price without the 68882 included). The PDS "adapter" is really nothing more than an extension of the IIsi's PDS slot which allows a PDS card to be plugged in parallel too the motherboard. And it comes with the 68882. The "NuBus" adapter is truly an adapter--It provides you with a true NuBus slot in which you can place any NuBus card (provided it does not have too high a power rating) Ron D.