Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84 exptools; site ihwpt.UUCP Path: utzoo!watmath!clyde!cbosgd!ihnp4!ihwpt!dafa From: dafa@ihwpt.UUCP (David Fay) Newsgroups: net.micro.mac Subject: Re: Re: 1.5 Meg Upgrade from MacMemory Message-ID: <536@ihwpt.UUCP> Date: Tue, 29-Oct-85 12:37:02 EST Article-I.D.: ihwpt.536 Posted: Tue Oct 29 12:37:02 1985 Date-Received: Wed, 30-Oct-85 07:20:15 EST References: <501@ihwpt.UUCP> <2092@amdahl.UUCP> <509@ihwpt.UUCP> <523@ihwpt.UUCP> <240@well.UUCP> <7807@apple.UUCP> Distribution: net Organization: AT&T Bell Laboratories Lines: 26 Thank you Donald North for clarifying how screen memory location is determined. One small correction - screen memory on the 128K is at $1A700 not $3A700. We have now installed our first MacMemory 1.5 Meg upgrade on top of an Apple 512K board. It was not a difficult job, requiring about the same level of skill as a 512K upgrade. Three ICs must be de-soldered on the mother board along with some other minor modifications. Less work is required on a 128K board which has been upgraded to 512K. The MacMemory board appears to be of high quality - at least as good as the Apple board itself. We can not detect any increase in heat coming out of the vents on top. The materials that come with the kit state that the upgrade is to be added to stock Apple boards with soldered (not socketed) RAM. Apparently this is because MacMemory believes socketed memory is not as reliable as soldered. Throwing all caution to the wind, our next upgrade will be on a homebrew 512K upgrade with low profile sockets. We have already determined that there is plenty of clearance for the daughter board even with the socketed memory. -- -------------------- David Fay AT&T Bell Laboratories Naperville, IL 60566 ihnp4!ihexp!dafa