System 4.1

System 4.1, Finder 5.5 (System Software 2.01)

Mac users had just a month to enjoy a nice 1 digit version number of their Mac OS. System 4.1 was released the following month newly updated to work with AppleShare 1.1. AppleShare 1.1 was required to network the newly released Mac II. This update also modified the way the Finder handled large capacity drives (namely those larger than 32 MB). System 4.1 also excluded the Mac 512K, as it required at least 1 MB of RAM to run. This was the last time Apple dropped hardware support for over a decade though; they would not exclude further models until the introduction of Mac OS 7.6 which only ran on "32-bit clean" hardware.


 * Released: April 1987