poleary@bonnie.ics.uci.edu (Petey O'Leary) (02/04/89)
I currently use a Mac SE with 1 meg of memory and am in desperate need of more memory (the LSC 3.0 debugger doesn't run on my whimpy 1 meg machine). I would hustle out and get a 1 meg SIMM but this SE/30 business has me worried: if and when I upgrade my old SE to the new SE/30, will I have to throw out my SIMM? I don't have the tech specs for the SE/30, so I can't just look it up. I assume that the SE/30 will take the same SIMM's that the SE does, but you can never be too sure about these things... Any information would be greatly appreciated. -- Peter O'Leary. "I still believe in God, but God no longer believes in me" - Wayne Hussey
dr@cs.columbia.edu (David Robinowitz) (02/04/89)
In article <6671@paris.ics.uci.edu> Petey O'Leary <poleary%bonnie.ics.uci.edu@orion.cf.uci.edu> writes: >if and when I upgrade my old SE to the new SE/30, will I have >to throw out my SIMM? I don't have the tech specs for the SE/30, so I >can't just look it up. I assume that the SE/30 will take the same SIMM's >that the SE does, but you can never be too sure about these things... > >Any information would be greatly appreciated. > >-- >Peter O'Leary. >"I still believe in God, but God no longer believes in me" - Wayne Hussey According to the nice woman at Apple (customer relations dept.) 120ns chips are fine for the SE/30. Look at your 1 meg chips -- if the last 2 #'s are <= 12, you're fine (says her). She also said that 120 ns chips would be fine for future 68030-based machines running at 33MHz (again, says her). Keep in mind that these are the same people who told me that A/UX can't run on the SE/30 cause the SE/30 can't support a 80 meg drive. >I would hustle out and get a 1 meg SIMM but this SE/30 business has me Also, you would have to hustle out and get 4 256K SIMMs or 4 1 meg SIMMs!
mithomas@bsu-cs.UUCP (Michael Thomas Niehaus) (02/05/89)
In article <6671@paris.ics.uci.edu>, poleary@bonnie.ics.uci.edu (Petey O'Leary) writes: > I currently use a Mac SE with 1 meg of memory and am in desperate need of > more memory (the LSC 3.0 debugger doesn't run on my whimpy 1 meg machine). > I would hustle out and get a 1 meg SIMM but this SE/30 business has me > worried: if and when I upgrade my old SE to the new SE/30, will I have > to throw out my SIMM? I don't have the tech specs for the SE/30, so I > can't just look it up. I assume that the SE/30 will take the same SIMM's > that the SE does, but you can never be too sure about these things... > > Peter O'Leary. > "I still believe in God, but God no longer believes in me" - Wayne Hussey Hustle out and get a 1 meg SIMM? You will need to get at least 2 meg. The SE/30 takes the same 120 ns memory that Apple has been using in the SE for some time. It seems to me that many people have questions about memory, so I will attempt to give a general overview of all of the machines: 1. Mac Plus. The Mac Plus requires 150 ns SIMMs or better. These chips must be installed in sets of 2. There are 4 SIMM slots available, so the possible memory configurations are: 1M,2M,2.5M, and 4M. The installation of more memory in a 1M machine will require the removal of two of the four 256k SIMMs to make room for two 1M SIMMs. Do NOT buy a 1M expansion kit, because odds are it will be 4 256k chips, which will not do you any good. Because some resistors and/or jumpers must be changed, it is not recommended that you try this unless you are absolutely sure of what you are doing. 2. Mac SE. The Mac SE is very similar to the Mac Plus, except that (for the most part) the SE ships with 120ns SIMMs. The machine in its standard 1M configuration has 4 256k SIMMs in it, filling all four of the available SIMM slots. The upgrade process is the same as the Mac Plus. All of the same configurations are possible, and the same warnings apply. 3. Mac II, Mac IIx, Mac SE/30. All three of these machines have 8 SIMM slots. The SIMMs for these machines must be 120ns or faster. Because of the 32 bit logic of these machines, the SIMMs must be installed in sets of 4. This makes these configurations possible: 1MB (4x256k), 2MB (8x256k), 4MB (4x1M), 5MB (4x256k and 4x1M), and 8MB (8x1MB). I would not recommend ever going to a 2MB configuration, because you must then discard some of the 256k SIMMs to put in the higher density 1MB SIMMs. Installation of these chips is much more straight forward, but because of static concerns, should be installed by an authorized dealer. In the future, if Apple introduces a faster machine, it will probably require faster memory. I believe that to introduce a 25MHz machine, 80ns memory must be used (unless you want to add wait states). With the memory situation as it is now, the supply of these chips would be very short, causing the price of such a machine to be more than most people would even consider. When memory prices come down and supply improves, expect to see a faster machine. (I see this as the reason that the IIx is "only" a 16MHz machine.) Michael Niehaus Apple Student Rep Ball State Unversity UUCP: ..!{pur-ee,iuvax}!bsu-cs!mithomas AppleLink: ST0374
lad@sdl.UUCP (Lawrence A. Deleski) (02/07/89)
From article <6671@paris.ics.uci.edu>, by poleary@bonnie.ics.uci.edu (Petey O'Leary): > I currently use a Mac SE with 1 meg of memory and am in desperate need of > more memory (the LSC 3.0 debugger doesn't run on my whimpy 1 meg machine). > I would hustle out and get a 1 meg SIMM but this SE/30 business has me > worried: if and when I upgrade my old SE to the new SE/30, will I have > to throw out my SIMM? I don't have the tech specs for the SE/30, so I > can't just look it up. I assume that the SE/30 will take the same SIMM's > that the SE does, but you can never be too sure about these things... The SE/30 does take the same simms that the SE does, with one important difference. The SE/30 is a 32 bit machine, therefore, simms have to be added four at a time. Where you could get 2 1 meg simms for the old SE and wind up with a 2.5 MB machine, this is not possible with the SE/30. -- Lawrence A. Deleski | Silicon Compiler Systems uunet!clyde!sdl!bub!lad | 15 Independence Blvd. Cash-We-Serve 76127,104 | Warren, NJ 07060 MABELL: (201) 580-0102 | Ext. 283