Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!joyce!sri-unix!hplabs!nsc!voder!apple!tecot From: tecot@Apple.COM (Ed Tecot) Newsgroups: comp.sys.mac Subject: Re: Puzzled with 6.0 Keywords: 6.0 Mac 512KE Message-ID: <14102@apple.Apple.COM> Date: 17 Jul 88 00:50:03 GMT References: <12045@agate.BERKELEY.EDU> Reply-To: tecot@apple.apple.com.UUCP (Ed Tecot) Distribution: na Organization: Apple Computer Inc, Cupertino, CA Lines: 20 In article <12045@agate.BERKELEY.EDU> c60a-6dd@web7c.berkeley.edu (Rob Pfile) writes: >If System release 6.0 is not supposed to work properly on a Mac 512KE, >then why have I been up and running for a week? > >I am running a 512KE manufactured in mid 1986, with a Dove 1MB upgrade >and an Apple HD20SC. > >The sound manager works fine. (as evidenced by the Sound CDEV and the >fact that it remembers my beep choice.) I'm going to tell you all a little secret (shhh!). All Macs are not created equal. Just as VW was able to improve the Beetle without changing its appearance, Apple continues to make incremental hardware improvements at the factory (As I'm sure most OEMs do). Since both the clock chip and SCC are pin-compatible, it is a simple matter to use these parts instead of the older ones (and easier to track as well). Since your Mac was manufactured in 1986 after the Mac Plus introduction, it is very likely that you have the newer SCC and clock chip (with extended parameter RAM). So that's why the sound manager works for you. Enjoy! _emt