jasst3@cisunx.UUCP (Jeffrey A. Sullivan) (11/09/87)
I have a question regarding the 256K SIMMs in the Mac SE. I have an SE and am about to have 2 1M SIMMs put into it tyo boost my RAM to 2.5M. I am also planning (in the relatively near future) to sell the SE and get a Mac ][. My Question is this: Can I just slip those 2 256K SImms into the second bank of the ]['s memory banks (along with another pair of 256K SIMMs) and have an extra meg? Are the speeds of the chips OK? Also, is it possible to un-do a 2M expansion to an SE so I could use the 2 1M SIMMs in the ][ and put the 256K SIMMs back in the SE? This raises another question: What are the allowable increments for adding SIMMs to a Mac ][? Can I pop in 1M SIMMs 1 at a time to bump my memory up by 1 Meg increments? What does the ][ come with: 4 256K SIMMs? Thanks for any help provided. .......................................................................... Jeff Sullivan University of Pittsburgh pitt!cisunx!jasst3 Intelligent Systems Studies Program jasper@PittVMS (BITNET) Graduate Student . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
kwallich@hpsmtc1.HP.COM (Ken Wallich) (11/10/87)
jasst3@cisunx.UUCP (Jeffrey A. Sullivan) / 11:07 am Nov 9, 1987 / >Question is this: Can I just slip those 2 256K SImms into the second bank >of the ]['s memory banks (along with another pair of 256K SIMMs) and have >an extra meg? Are the speeds of the chips OK? The Mac II comes with 120ms chips. The SE comes with 150ms chips. The Mac II will run with ALL 120ms chips, or ALL 150ms chips, but if you combine the two, it will only recognize the faster (120ms) chips. You could put 120ms chips in your SE, but I don't know how well this works (I have a MacII :-). Also I assume you mean 4 256K SIMMs to make a Meg. Even though they sell them in 2's, 1 SIMM is either 256K or 1MB depending on the chips. >Also, is it possible to un-do a 2M expansion to an SE so I could use the 2 >1M SIMMs in the ][ and put the 256K SIMMs back in the SE? The same chip speeds apply to the 1MB chips. See the previous caviats, or is that caviar? >This raises another question: What are the allowable increments for adding >SIMMs to a Mac ][? Can I pop in 1M SIMMs 1 at a time to bump my memory up >by 1 Meg increments? What does the ][ come with: 4 256K SIMMs? The II (][ reminds me of a *gag* Apple ][) does indeed come with 4 256K SIMMs unless you order it with more, in which case the dealer will insall the upgrade, and keep the 256K chips for someone else (be carefull not to pay for them!). You cannot "pop" 1MB SIMMs 1 at a time :-(. There are 2 "banks" of memory, and each must be fully populated (4 SIMMs) with the same density chips. In multiple density configurations, the highest density chips must be in the lowest bank (bank "A"). Possible memory configurations are as follows (this is reposted from something someone else posted a month or two ago, sorry I don't remember who): RAM Bank A Bank B What To Order ----- ------- ------- ------------- 1M Four 256K SIMMs Empty Factory Standard 2M Four 256K SIMMs Four 256K SIMMs 1 - MO218 4M Four 1M SIMMs Empty 2 - MO219 5M Four 1M SIMMs Four 256K SIMMs 2 - MO219 8M Four 1M SIMMs Four 1M SIMMs 4 - MO219 Where: MO218 - 4 256K SIMMs MO219 - 2 1Mb SIMMS ---------- Hope this helps you out! -------------------- Ken Wallich *My views are mine, and mine alone* Consultant "Camelot! Camelot! -- It's only a model" DCI kwallich@hpsmtc1.HP.COM @Hewlett Packard ...hplabs!hpsmtc1!kwallich "Your Delta Tou Kai name is ... Flounder"
drc@dbase.UUCP (Dennis Cohen) (11/11/87)
In article <5134@cisunx.UUCP>, jasst3@cisunx.UUCP (Jeffrey A. Sullivan) writes: > I have a question regarding the 256K SIMMs in the Mac SE. I have an SE and > am about to have 2 1M SIMMs put into it tyo boost my RAM to 2.5M. I am also > planning (in the relatively near future) to sell the SE and get a Mac ][. My > Question is this: Can I just slip those 2 256K SImms into the second bank > of the ]['s memory banks (along with another pair of 256K SIMMs) and have > an extra meg? Are the speeds of the chips OK? No, you cannot just plug those two in, you'll need two more as well. The Mac II requires memory expansions in groups of four (4) SIMMs. If the chips are 120nS you'll be ok on speed. > > Also, is it possible to un-do a 2M expansion to an SE so I could use the 2 > 1M SIMMs in the ][ and put the 256K SIMMs back in the SE? Yes, it's possible to undo the expansion to the SE, but you'll still need four SIMMs for the Mac II, so the 2 1MB SIMMs are only useful in the SE (or a Plus) in that quantity. > > This raises another question: What are the allowable increments for adding > SIMMs to a Mac ][? Can I pop in 1M SIMMs 1 at a time to bump my memory up > by 1 Meg increments? What does the ][ come with: 4 256K SIMMs? The allowable configurations for the Mac II are: 1 MB: 4 256KB SIMMs in the four slots closest to the right side (facing) 2 MB: 8 256KB SIMMs 4 MB: 4 1MB SIMMs in the four slots closest to the right side 5 MB: 4 1MB SIMMs in the four rightmost slots & 4 256KB SIMMs in the other four slots 8 MB: 8 1MB SIMMs Dennis Cohen Ashton-Tate Glendale Development Center dBASE Mac Development Team -------------------------- (Standard disclaimer applies)
ir353@sdcc6.ucsd.EDU (Matthew Grayson) (11/11/87)
In article <11540041@hpsmtc1.HP.COM> kwallich@hpsmtc1.HP.COM (Ken Wallich) writes: >The Mac II comes with 120ms chips. The SE comes with 150ms chips. >The Mac II will run with ALL 120ms chips, or ALL 150ms chips, but if you >combine the two, it will only recognize the faster (120ms) chips. Shhhhh! My Mac II might hear you. Perhaps the faster chips just have to be farther from the processor? I've had no troubles since I bought 1 meg of used 150ns SIMMs to upgrade to 2 meg. $180 for 2meg seemed a better idea than $1000 for 5. Unfortunately, running TeXtures with LaTeX under multifinder leaves me 36K available. sigh.... Matt
isle@dartvax.UUCP (Ken Hancock) (11/11/87)
In article <5134@cisunx.UUCP> jasst3@cisunx.UUCP (Jeffrey A. Sullivan) writes: >Question is this: Can I just slip those 2 256K SImms into the second bank >of the ]['s memory banks (along with another pair of 256K SIMMs) and have >an extra meg? Are the speeds of the chips OK? > >Also, is it possible to un-do a 2M expansion to an SE so I could use the 2 >1M SIMMs in the ][ and put the 256K SIMMs back in the SE? First question. The SE uses 150 nanosecond 256K SIMMs. (-15 on the chip). 120 nanosecond chips should be used on the Mac II. (-12). I have heard of people who have put in 150's...I don't know what the effect is...probably slower memory. (Anyone from Apple care to clarify this?) Second Question. It should be reversable as long as you have the -12 1MB SIMMs. I believe that a resistor should have also been removed when the 2 1MB SIMMs were swapped for the 256K SIMMs, so that would also have to be replaces. Ken -- Ken Hancock UUCP: isle@dartvax BITNET: isle@u2.dartmouth.edu DISCLAIMER: If people weren't so sue-happy, I wouldn't need one!
david@wiley.UUCP (David Hull) (11/13/87)
In article <5134@cisunx.UUCP> jasst3@cisunx.UUCP (Jeffrey A. Sullivan) writes: >Also, is it possible to un-do a 2M expansion to an SE so I could use the 2 >1M SIMMs in the ][ and put the 256K SIMMs back in the SE? To expand the memory in an SE to more than the original 1 megabyte, you have to cut a resistor out (my guess is that this resistor sets the starting address of the second bank of memory). If you cut through only one of the leads to the resistor, you might be able to undo the upgrade if you blobbed some solder on the cut, but it would be ugly. The resistor is near SIMM #1, and is labeled "256K." The 1M SIMMS go in the slots labeled "SIMM 1" and "SIMM 2." You should use 120ns SIMMS in your Mac II. Chip tolerances being what they are, you can probably get away with 150ns SIMMS, but I wouldn't recommend it. The Mac SE will use either kind with no problem. I think that most upgrades sold today are 120ns SIMMS, though. The Apple upgrade is. Check before ordering. -David --------------------------------------- David Hull TRW Inc. Redondo Beach, CA ...!{uunet,cit-vax,trwrb}!wiley!david
dgold@apple.UUCP (David Goldsmith) (11/13/87)
In article <11540041@hpsmtc1.HP.COM> kwallich@hpsmtc1.HP.COM (Ken Wallich) writes: >The Mac II comes with 120ms chips. The SE comes with 150ms chips. >The Mac II will run with ALL 120ms chips, or ALL 150ms chips, but if you >combine the two, it will only recognize the faster (120ms) chips. You could >put 120ms chips in your SE, but I don't know how well this works (I have a >MacII :-). Also I assume you mean 4 256K SIMMs to make a Meg. Even though >they sell them in 2's, 1 SIMM is either 256K or 1MB depending on the chips. You CANNOT use 150ns SIMMs in the Macintosh II AT ALL, under ANY conditions. The Mac II only works with 120ns RAM. It has nothing to do with mixing 120ns with 150ns; only 120ns RAM is fast enough. Some people may succeed in using 150ns RAM because the parts they are using exceed spec and are in fact fast enough, but there is no guarantee that will work -- you may experience intermittent errors. Repeat: use ONLY 120ns RAM in the Mac II. The Mac SE will work fine with either 150ns RAM, 120ns RAM, or any mixture of the two. -- David Goldsmith Apple Computer, Inc. AppleLink: GOLDSMITH1 UUCP: {nsc,dual,sun,voder,ucbvax!mtxinu}!apple!dgold CSNET: dgold@apple.CSNET, dgold%apple@CSNET-RELAY BIX: dgoldsmith