Path: utzoo!attcan!uunet!wuarchive!usc!apple!marc From: marc@Apple.COM (Mark Dawson) Newsgroups: comp.sys.mac.hardware Subject: Re: Mac IIsi SIMMs Message-ID: <45853@apple.Apple.COM> Date: 21 Oct 90 00:29:25 GMT References: <209@cogsci.ucsd.EDU> Distribution: na Organization: Apple Computer Inc., Cupertino, CA Lines: 47 In article <209@cogsci.ucsd.EDU> costin@cogsci (Dan Costin) writes: >I talked to the Chip Merchant today and they said that you just >use regular Mac SIMMS (80ns) for the IIsi. $37 ea., and >I think you need to buy 4 due to the architecture of the IIsi. > Both the LC and IIsi can use the IIci's SIMMs (I have done so). On the LC you don't NEED that fast of RAM, but it doesn't hurt to use it (nothing happens any faster with faster RAM, just as always). As to some of the other questions: (1)The IIsi and LC have 2 banks of RAM, 1 bank that is soldered in and one bank that you can put SIMMs in. So all of the regular "bank" rules hold: all SIMMs must be of the same size and though you can mix speeds of RAM, they must all be at least as fast as recommended. (2) The IIsi works just like the IIci in that the screen memory for the on-board video comes out of the same RAM that your programs use; the LC has its own video RAM (so there's no competition between the CPU and video on the LC as there is on the IIci and IIsi). (3) Neither the LC nor the IIsi come with an FPU; both support one. Apple will be releasing a NUBUS adapter card for the IIsi that will include an FPU; 3rd parties are releasing cards for the LC that include an FPU. (4) LC's RAM configurations are: (2 RAM SIMM sockets) 2mb (no SIMMs), 4mb (2 1mb SIMMs), 6 (2 2mb SIMMs), and 10 (2 4mb SIMMs) (5) LC's video RAM configuration is: (same SIMM as 8x24 card uses) (a) 256K: supports the 512x384 monitor up to 8bits/pix (others 4bits/pixel) (b) 512K: supports the 512x384 up to 16bits/pixel; others at 8 bits/pixel. (6) The IIsi's RAM configurations are: (4 RAM SIMM sockets) 1mb (no SIMMs), 2mb (4 256K SIMMs), 3mb (4 512K SIMMs), 5mb (4 1mb SIMMs), 9mb (4 2mb SIMMs), 17mb (4 4mb SIMMs), and (POSSIBLY) 65mb (4 16mb SIMMs). (7) Apple is not shipping the 512K SIMMs and 2mb SIMMs yet; I'm not real sure when they will be (my personal opinion will be that 3rd parties will come with them 1st and cheaper, but that's just an historical observation). Hope this helps, Mark -- --------------------------------- Mark Dawson Service Diagnostic Engineering AppleLink: Dawson.M Apple says what it says; I say what I say. We're different ---------------------------------