bin@primate.wisc.edu (Brain in Neutral) (12/22/90)
Well, I'll freely confess to not having any knowledge of hardware, but... I just installed 4MB memory in two Macintosh IIsi's, which were ordered in identical configuration but which arrived about 3 weeks apart. (Memory was from Chip Merchant, by the way. Installation was a snap. Memory worked perfectly). I noticed that the second machine didn't have the card installed that sits next to the RAM SIMM slots. "Odd, I thought. What is it?" and peered closer to the circuit board. It says "ROM SIMM" by the card bay. So I have two "identical" machines, except that one is apparently missing its ROM! But it works... What's the deal? -- Paul DuBois dubois@primate.wisc.edu
kanefsky@cs.umn.edu (Steve Kanefsky) (12/22/90)
In article <3624@uakari.primate.wisc.edu> bin@primate.wisc.edu (Brain in Neutral) writes: >Well, I'll freely confess to not having any knowledge of hardware, but... > >I just installed 4MB memory in two Macintosh IIsi's, which were >ordered in identical configuration but which arrived about 3 weeks >apart. (Memory was from Chip Merchant, by the way. Installation >was a snap. Memory worked perfectly). > >I noticed that the second machine didn't have the card installed that >sits next to the RAM SIMM slots. "Odd, I thought. What is it?" and >peered closer to the circuit board. It says "ROM SIMM" by the card >bay. > >So I have two "identical" machines, except that one is apparently >missing its ROM! But it works... > >What's the deal? The ROM SIMM slot was intended for ROM *upgrades*. The ROM included with newer IIsi's is soldered onto the motherboard (to save on manufacturing costs). Apple did mention that some of the first IIsi and LC Macs may have the ROM on SIMMS instead of soldered in. It shouldn't make any difference at all in terms of performance or upgradability whether your ROMs are soldered-on or on SIMMS. It just saves apple a few $$$ to mass-produce mother boards with the ROM soldered-on. -- Steve Kanefsky kanefsky@cs.umn.edu
marc@Apple.COM (Mark Dawson) (12/22/90)
In article <3624@uakari.primate.wisc.edu> bin@primate.wisc.edu (Brain in Neutral) writes: >Well, I'll freely confess to not having any knowledge of hardware, but... > >I just installed 4MB memory in two Macintosh IIsi's, which were >ordered in identical configuration but which arrived about 3 weeks >apart. (Memory was from Chip Merchant, by the way. Installation >was a snap. Memory worked perfectly). > >I noticed that the second machine didn't have the card installed that >sits next to the RAM SIMM slots. "Odd, I thought. What is it?" and >peered closer to the circuit board. It says "ROM SIMM" by the card >bay. > >So I have two "identical" machines, except that one is apparently >missing its ROM! But it works... > >What's the deal? > Probably means they finally got the ROMs that they put on the logic board in production (the ROM SIMMs are more expensive). Mark -- --------------------------------- Mark Dawson Service Diagnostic Engineering AppleLink: Dawson.M Apple says what it says; I say what I say. We're different ---------------------------------
granteri@pnet51.orb.mn.org (Grant Erickson) (12/25/90)
bin@primate.wisc.edu (Brain in Neutral) writes: >I noticed that the second machine didn't have the card installed that >sits next to the RAM SIMM slots. "Odd, I thought. What is it?" and >peered closer to the circuit board. It says "ROM SIMM" by the card >bay. > >So I have two "identical" machines, except that one is apparently >missing its ROM! But it works... > >What's the deal? > >-- As I believe it to be, some of the first IIsi's were shipped with the ROMs soldered to the mother board. Peering inside mine I have a ROM SIMM. However, a friend who bought his on Oct. 16 is lacking the afformentioned SIMM. Someone please feel free to correct and flame me if this infomation is erroneous. >Paul DuBois >dubois@primate.wisc.edu Grant Erickson .______________________________________________________. | UUCP: {crash, tcnet}!orbit!pnet51!granteri | | ARPA: crash!orbit!pnet51!granteri@nosc.mil | | INET: granteri@pnet51.orb.mn.org | |------------------------------------------------------| | The right half of the brain controls the left half | | of the body. This means that only left-handed people | | are in their right mind. | !______________________________________________________!