bst2948@cec2.wustl.edu (Bryan Sauhsung Tung) (04/23/91)
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?
gaynor@magnus.ircc.ohio-state.edu (Jim Gaynor) (04/24/91)
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"
llvvll@mixcom.COM (James R. Macak) (04/24/91)
In article <1991Apr23.181407.23784@magnus.acs.ohio-state.edu> gaynor@magnus.ircc.ohio-state.edu (Jim Gaynor) writes: >In article <1991Apr23.155150.7671@cec1.wustl.edu> bst2948@cec2.wustl.edu (Bryan Sauhsung Tung) writes: >> (several lines deleted) > (several lines deleted) >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. I've read this before about the SIMMs needing to be the same "speed" within a bank, but never really understood the reason for this. Can someone post an explanation (avoiding extreme techo-babble)? How much tolerance might be acceptable relative to the speed difference? I have some 70ns SIMMs... need I find some more 70ns or will 80ns do? >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- In the 5 meg configuration, does it matter if the 1 MB SIMMs are in bank "A" or "B?" Might there be a speed degradation if the 256 K SIMMs were in one bank or the other? I thought I had read something about this once upon a time... (Note this is for a "straight" SE/30 without any card in its slot.) Thanks. Jim -- macak@mixcom.UUCP (James R. Macak) "I'm curious, Doctor, why is it uunet!uwm!mixcom!macak called 'M-5' and not 'M-1'?" << All my own opinions. >>