System Re Installing 32 Bit

Date: Wed, 21 Jun 1995 19:21:47 +0300 (MET-DST) From: Federico Giacanelli <GIACANELLI@to.infn.it> Subject: System re-installing & 32 Bit addressing - SUMMARY OF REPLIES Hello, some week ago I posted a message about a Mac IIci with its System taking 14 MB of 20 MB total RAM. I received more than 30 replies! Thank you all very much, Info-Mac people! Now I post a summary of the replies I received, as requested by someone that wrote me. I will quote parts of the mails but i won't quote the author's name because I don't know if they want their name be written here. Anyway I know who they are and I thank again everybody. ---------------------------------------------------------------------- Here is my original message: >Subject: System re-installing (Q) > >Hello, > >sorry if this is a FAQ, I'm posting for a friend that can't read the digest. > >Situation: Mac IIci, 20 MB RAM, connected to ethernet, in a local net at the >university and then to the internet. >The System takes about 14 MB RAM!! >We think there is something wrong with the system and plan to re-install it. > >The question is: will he lose the hard disk files so does he need to backup >it? I remember one can install the system without deleting other files at all. > >More: In the case of re-installing, what will happen to the old folders in the >systm folder, like Control Panels, Extensions, etc.? He has many non-Apple >extensions, wil he lose them or the new system will create a new System Folder >containing also the old files? > >Please reply directly to me and I'll summarize for the digest if someone is >interested in, > >TIA, >Cheers, > > Federico >giacanelli@to.infn.it The answer is that my friend's Mac has the 32 bit addressing turned off. He turned on the 32 bit addressing in the "memory" control panel and everything is got OK. Here is an answer about that: >The reason is that in 16-bit mode the Mac can only address 8MB of memory. >The system knows there is 20MB RAM out there so it blocks off the >inaccessible 12MB by claiming that it's using it for itself. In 32-bit mode >the full 20MB is addressable. > >Caution: while nearly all modern applications are 32-bit clean, some older >ones were written to the 16-bit addressing standard and will fail unless by >some intermittent lucky chance they get loaded into the bottom 8MB of >memory. You can't tell by looking at an app, so if try one and it fails >contact the publisher for an upgrade. The second part of my post asked about cautions needed when one reinstall the System. Well, everyone told me that a backup is not necessary but it is a good thing to do in *any* case. A System re-install deletes only the Apple files in the System Folder with the new ones. One needs only to backup screen fonts in the System document because a new System document will be created. Here are some replies: >Hello, >The following are some notes on how to re-install your system without <losing anything. >I hope it is …