Hello I have an un-upgraded 128k Macintosh. It's been running and booting from a system 2 / finder 1.1g disk with no problems. recently I thought it would be fun to get it to boot from the oldest version of the mac OS I could find. Bizarrely I have found that it will not boot from any system disk prior to system 2 / finder 1.1g which was released a year after my Mac was made. So far I have tried .97/1.0 and 1.1/1.1 without success. I created 400 disks using DiskDup+ and I know it worked as the disks work perfectly in my Mac Plus (which is obviously newer than the 128k!!). Any one have any ideas? The 128k Mac is the British version, although I don't think this would have any relevance.