Newsgroups: comp.sys.mac.hardware Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!gaynor From: gaynor@magnus.ircc.ohio-state.edu (Jim Gaynor) Subject: Re: What are the possible memory configurations of an SE/30? Message-ID: <1991Apr23.181407.23784@magnus.acs.ohio-state.edu> Sender: news@magnus.acs.ohio-state.edu Nntp-Posting-Host: top.magnus.acs.ohio-state.edu Organization: The Ohio State University References: <1991Apr23.155150.7671@cec1.wustl.edu> Date: Tue, 23 Apr 1991 18:14:07 GMT Lines: 35 In article <1991Apr23.155150.7671@cec1.wustl.edu> bst2948@cec2.wustl.edu (Bryan Sauhsung Tung) writes: > I've already asked this question about the IIsi, but it seems >that the SE/30 may be a better deal. How many memory slots does the >SE/30 have, and what size memory will the slots take? Also, do all >the slots need the same size memory? Lastly, is upgrading memory in >an SE/30 easy to do? The SE/30 has 2 bank of 4 slots each. Each bank must be filled with SIMMs of the same size, and the really ought to be of the same speed as well. The SE/30 requires a minimum memory speed of 120ns, which isn't difficult - most SIMM suppliers sell SIMMs that run at 70-80ns. Thus, with 256k SIMMs, 1MB SIMMs, and 4MB SIMMs, you have the following possible combos: Total RAM Bank "A" Bank "B" --------- -------- -------- 1 MB 4 256k SIMMs -empty- 2 MB 4 256k SIMMs 4 256k SIMMs 4 MB 4 1MB SIMMs -empty- 5 MB 4 1MB SIMMs 4 256k SIMMs 8 MB 4 1MB SIMMs 4 1MB SIMMs 16 MB * 4 4MB SIMMs -empty- Once you start getting into the 4MB SIMMs, however, you run into the memory limits that are introduced by the lack of a 32-Bit Clean ROM for the SE/30. From what I currently understand, you cannot address more than 16MB of memory space on an SE/30 (or IIcs, or IIx...). This includes addressing space used by virtual memory, RAM, System ROMs, and expansion card. The sum may not exceed 16 MB. -- Jim Gaynor - Systems Analyst 1 + "Pooh hasn't much Brain, but he never Ohio State University ACS-FMS-OCES | comes to any harm. He does silly gaynor@magnus.acs.ohio-state.edu | things and they come out right." gaynor@agvax2.ag.ohio-state.edu + -Piglet, from "Winnie-The-Pooh"