On Aug 11, 8:19 am, QuoVadis <eelcovanv...@home.nl> wrote: > I had always thought one needed to swap ROMs to get at all 128MB RAM. > Or was it the MODE32 extension that made all 128MB available? > > But, correct me if I'm wrong, swapping the ROM with that of a IIfx > makes it true 32-bit, without having to load any extensions. Is that > correct?
Correct. One may install 128MB of RAM in the SE/30 but it will not use more than 8 MB as system RAM as long as the machine is in 24 bit addressing mode. The ROM of the SE/30 does not support 32 bit addressing, so one must either install the extension Mode 32, or swap the ROM with a IIci, IIsi, or IIfx. All the IIfx's had their ROM on a SIMM, so that's the easiest to find. Some rare (early?) IIsi's had their ROM on a SIMM so there are some of those modules floating around. The IIci never had its ROM on a SIMM, but at least one has been built using IIci code and it works. I only mention the IIci because it's the earliest machine with 32 bit clean ROMs (or did the IIfx predate it?). Jeff Walther -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to vintage-macs@googlegroups.com To leave this group, send email to vintage-macs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
